PhD student

How deep is that snow? Machine learning helps us know

Rachel Sauer — Thu, 10 Jul 2025 13:30:00 +0000

How deep is that snow? Machine learning helps us know Rachel Sauer Thu, 07/10/2025 - 07:30

Blake Puscher

��Ҵ�ý�ƽ�� researchers apply machine learning to snow hydrology in Colorado mountain drainage basins, finding a new way to accurately predict the availability of water

Determining how much water is contained as snow in mountain drainage basins is very important for water management, because measuring it is a necessary part of predicting the availability of water—especially in places that rely on snowmelt for their water supply, like Colorado and other western states.

Snow water equivalent is the amount of water in a mass of snow or snowpack. The depth of this water is a fraction of the snow depth, and this fraction is obtained by multiplying the depth by the snow density, which is expressed as a percentage of the density of water. If there are 10 inches of snow with a density of 10%, the snow water equivalent is 1 inch.

A persistent challenge is that snow water content is calculated from both snow depth and snow density, yet it remains unfeasible to directly measure snow density over a large area. Traditionally, this issue has been addressed with remote sensing, which allows for consistent and relatively large-scale measurements. However, remote sensing methods have their own limitations, which has prompted the search for an alternative in machine-learning technology.

��Ҵ�ý�ƽ�� researchers Jordan Herbert (left), a PhD candidate, and Eric Small, a professor of geological sciences, developed a model that can estimate the snow density at times when and in places where it has not been observed or sensed.

In their study on the subject, University of Colorado Boulder Ph.D. candidate Jordan Herbert and Professor Eric Small of the Department of Geological Sciences developed a model that can estimate the snow density at times when and in places where it has not been observed or sensed. This model is split into different scenarios, each trained on a different subset of the data, and while performance varied, all scenarios were more accurate than extrapolation from remote sensing methods, according to Herbert and Small.

Model performance analyses also demonstrated that information from Airborne light detection and ranging (LIDAR) can be transferred to different times and places within the region it was collected.

LIDAR and SNOTEL data

LIDAR surveys are an important tool in snow hydrology, as they provide detailed information about snow properties, specifically through their detection of snow depth.

“You fly the plane twice,” Small says, “once when there’s no snow, once when there is snow. The laser reflects off the surface, and if you know where the plane is and the distance to the surface, then you know the height of the snow relative to the ground surface.” This is called differential LIDAR altimetry.

While LIDAR is very useful in snow hydrology, it does have some limitations. The first is that it only measures snow depth, but snow density (either measured or modeled) is also needed to determine snow water equivalent. This isn’t a unique limitation, however, because snow density cannot be surveyed in the same way as snow depth.

“Measuring snow density in the field reveals just how variable the snowpack is,” Herbert explains. “Depending on if you dig a snow pit under a tree or on a north versus south facing aspect, you can get a completely different answer.”

This is a major limitation of on-site observations. Density also varies with depth, and remote sensing signals will be affected by the amount of liquid water content in snow, which makes measuring snow density remotely or over a broad scale impossible for the foreseeable future.

The second and more easily addressed issue with LIDAR surveys is the logistical issues associated with necessary plane flights.

“You can’t fly a plane all the time,” Small says. “It’s too expensive, and we don’t have enough planes to fly everywhere.” Planes also cannot be flown when the weather is bad, and surveys only provide a snapshot of snow depth, which can change rapidly as snow falls or melts.

“Measuring snow density in the field reveals just how variable the snowpack is. Depending on if you dig a snow pit under a tree or on a north versus south facing aspect, you can get a completely different answer,” says ��Ҵ�ý�ƽ�� researcher Jordan Herbert. (Photo: Pixabay)

These limitations can be worked around by using the LIDAR data to train computer models. “Based on that,” Small says, “you can use the LIDAR information to make predictions in the absence of LIDAR at another time or date or location. So, you’re leveraging the scientific information from LIDAR to improve your knowledge generally.”

Snow telemetry (SNOTEL) is an automated system of snow and climate sensors run by the National Resource Conservation Service, which is part of the U.S. Department of Agriculture. There are about a thousand SNOTEL sites across the western United States—small wilderness areas filled with sensing equipment that measures precipitation, snow mass and snow depth.

“All snow hydrology is based on data from these stations,” Small says. “The problem is that they only cover a small area. If you take all the SNOTEL stations in the western U.S. and put them next to each other, they’d be about the size of a football field, so they’re vastly under sampling. That’s why people want to use LIDAR to fill in all the spaces around them.”

The random forest model

Linear regression makes quantitative predictions based on one or more variables, but it becomes difficult to perform when many of these variables interact with each other in complex ways. In this case, some examples are elevation, solar radiation, slope, tree cover and so on. The difficulty of working with all these variables can be minimized by a modeling tool called a regression tree.

“A binary regression tree splits your sample into two groups, and it splits that sample to figure out which variable has the most effect on the thing you're trying to predict,” Small explains. The branching structure created by these splits gives the model its name and is designed to minimize errors. Each branching point is a condition like true/false or yes/no, the answer to which determines the path taken.

Regression trees are useful in that they fit the data better than multiple linear regression models, which are the other option when it comes to using linear regression when there are many variables involved. The better a model fits the observed data, the better it will be at predicting data that have not been observed, Small says.

However, regression trees have their own limitations.

“The downside of a binary regression tree is that it only gives you categorized values,” Small says. “For example, snow depth could be 70 centimeters, 92 centimeters or 123 centimeters. You end up with a map that just has these particular values.” This issue can be solved by combining multiple regression trees into a random forest model.

“What a random forest does,” Small explains, “is take a bunch of these binary regression trees and samples them randomly to give you continuous distributions of the variable that you care about. So instead of it being in these categories, it's more like how we think about snow depth.”

“All snow hydrology is based on data from (SNOTEL) stations. The problem is that they only cover a small area. If you take all the SNOTEL stations in the western U.S. and put them next to each other, they’d be about the size of a football field, so they’re vastly under sampling," says ��Ҵ�ý�ƽ�� Professor Eric Small. (Photo: Ruvin Miksanskiy/Pexels)

Machine learning

While using binary regression trees allows the predictive model discussed in this study to fit the data better, there are other things to consider, Small says. “In machine learning and other statistics, there’s this trade-off between how well a model can fit the information you give it and how generalizable it is. If I keep adding training data, training the model and tuning the parameters, I can have it fit the data pretty well, but then it becomes fixated on those very specific data, and it’s not going to make good predictions elsewhere.”

This is called “overfitting,” and it can be described simply as the model becoming too used to patterns in the data it was trained on. In anticipating these patterns, the model will make incorrect predictions that would have been right in the same place or under the same circumstances as the training data were collected, but aren’t otherwise.

This explains the different performance of the three different versions of the model: the site-specific model, the regional model and the site-specific and regional (SS+Reg) model. The site-specific model makes predictions about a given basin using LIDAR data from the same basin that was collected at other dates, whereas the regional model makes predictions about a basin using data from other basins and at other dates. The SS+Reg model was trained using all available data.

The SS+Reg model was the most accurate, but all models were generally accurate, both compared to models from prior studies and remote sensing methods. Because models of the sort used in this study output on the 50-meter scale, this scale was used to compare this study’s models to existing ones, and the former were more accurate. The models’ outputs were at a scale of 50 meters, but these were upscaled to 1- and 4-kilometer scales as well.

The 1- and 4-kilometer scales are more typically used in water management applications, and all three models became more accurate when applied to these scales, outperforming SNOTEL. This means that the models were more accurate than extrapolation from observation data. The success of both the SS+Reg and regional models indicates that information gained from LIDAR is transferable to different times and locations within the Rocky Mountain Region.

Besides fitting the data well and being adaptable to different scales between the three model scenarios, this approach is also beneficial because it does not rely on modeling physical processes (like snow formation, accumulation and melt) or on uncertain weather data. This makes it so that, once a model is trained, it doesn’t take long to make predictions. “The big gain is that it's much more computationally efficient and it just takes a fraction of the time,” Small says. “It's about 100 times faster.”

Herbert says “machine learning has been a huge benefit to my research, with the results to back it up. It’s freed up my time in the winter to put skis on and dig more snow pits to get the density data we desperately need.”

“For whatever reason, all our physically based models and our knowledge of science just gets in our way of making predictions,” Small explains, “because we've tried to boil it down to these simple equations, but it's not simple.”

"Machine learning has been a huge benefit to my research, with the results to back it up. It’s freed up my time in the winter to put skis on and dig more snow pits to get the density data we desperately need."

Expanding to other regions

The primary limitation of the snow density-measuring framework that the researchers created for this study was its reliance on on-site and LIDAR data for snow depth measurements. Small says that this could be addressed by bringing in other data sets, which would provide a more independent test of success than models’ ability to predict snow density in regions they were not trained on.

One of these data sets, the fractional snow-covered area (how much of the ground is covered by snow), could be measured using LIDAR equipment mounted to a satellite rather than relying on airplanes. While LIDAR has been used with satellite technology, this doesn’t address the limitations of plane-mounted LIDAR, because as Small says, “the (satellite) overpass interval is very slow. It’s about 90 days before it comes back to the place you’re looking at. So, you get a snapshot very infrequently, but it’s everywhere on the planet.”

The next step of developing this kind of model is to apply it to other regions, and it remains to be seen how easily that translation can be made, Herbert says.

“We’ve just begun running the model in California to see if the model works in regions with different climates,” he says. “We want to see how transferable data from one region is to another, and California is an ideal test site since it has more LIDAR than anywhere else in the world.”

The presence of LIDAR is important because these data were the most useful when it came to statistical model validation, or making sure that the models were accurate and reliable, compared to data limited by the small-area reporting of SNOTEL and the variability of on-the-ground snow density measurements. Without data to judge models’ predictions against, it is impossible to determine how well they do, because the actual snow depth is unknown.

Also, because LIDAR isn’t available everywhere, it is important to continue developing other methods of validation, the researchers say. Small says reducing reliance on LIDAR will help the innovative modeling framework apply to many parts of the country.

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��Ҵ�ý�ƽ�� researchers apply machine learning to snow hydrology in Colorado mountain drainage basins, finding a new way to accurately predict the availability of water.

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Supporting survivors of sexual assault through community

Rachel Sauer — Thu, 03 Jul 2025 00:31:29 +0000

Supporting survivors of sexual assault through community Rachel Sauer Wed, 07/02/2025 - 18:31

Cody DeBos

CU PhD graduate Tara Streng-Schroeter's research offers a new way to support survivors of sexual violence

The first time Tara Kay Streng-Schroeter stepped into a sorority house to deliver her sexual assault support training, she hoped it would help students feel more prepared to support one another.

She didn’t anticipate the crowd of women lining up afterward to ask questions and offer thanks.

“At one chapter, many women came up to me and thanked me for being there, told me how important they think this training is,” she recalls. “Some said it was better than any training they’ve received from school or as an RA (resident advisor).”

��Ҵ�ý�ƽ�� scholar Tara Streng-Schroeter, who earned a PhD in sociology in May, designed a peer-based intervention program designed to help students respond supportively when someone they care about discloses they have experienced sexual violence.

That moment reaffirmed Streng-Schroeter’s belief in what she’d spent years building: a peer-based intervention program designed to help students respond supportively when someone they care about discloses they have experienced sexual violence.

Her program, called Building Support for Survivors (BSS), offers a promising new approach to how college campuses can support students who experience sexual violence.

“We know the majority of survivors never seek support from the police or formal support from a non-profit or university resources. They instead disclose to a close connection,” Streng-Schroeter says.

Yet most students haven’t been trained to handle such a sensitive moment. Even well-intentioned responses can backfire, leading to shame, self-blame or isolation for survivors.

That’s the gap Streng-Schroeter, who in May earned her PhD in sociology from the University of Colorado Boulder, hopes to close.

Taking innovative research to the front lines

Streng-Schroeter has spent more than a decade working both professionally and academically in the field of sexual-violence response. She has coordinated sexual-assault response teams, trained volunteer victim advocates and witnessed firsthand the long-term effects of both harm and healing.

After talking with hundreds of survivors, she was acutely aware of the opportunity that existed to help college students support their peers who have experienced sexual violence.

Building Support for Survivors, a 90-minute training intervention that she designed to be implemented with peer groups of college students and has piloted with sorority chapters, combines education about the prevalence of sexual violence with hands-on learning around how to listen, what to say and what not to say.

As part of Building Support for Survivors, Streng-Schroeter also provides customized flyers listing local confidential and non-confidential support options.

“Even though there are so many victims within campus communities, students don’t necessarily know the right thing to say to someone who’s experienced this kind of violence unless they have received training,” she says. “And it’s those individuals that don’t have the training but need it that we’re trying to help.”

Over the course of her study, Streng-Schroeter partnered with sorority chapters at nine universities across the country, delivering her training in person at four of them.

A wake-up call

“We know the majority of survivors never seek support from the police or formal support from a non-profit or university resources. They instead disclose to a close connection,” says ��Ҵ�ý�ƽ�� researcher Tara Streng-Schroeter.

One of the most striking findings of Streng-Schroeter’s research was just how many students have been affected by sexual violence. More than half of the sorority women who completed her surveys reported experiencing sexual violence in their lives.

That number is significantly higher than national averages had previously suggested.

“It could have happened in the week or the month or the semester leading up to when they took a survey,” Streng-Schroeter says, “but it also could have happened when they were a child, or when they were in high school.”

She notes that sorority members, as well as queer students, are disproportionately affected by sexual violence on college campuses. However, many studies only ask about incidents within a narrow time frame, obscuring the full picture.

“Knowing more about what the actual affected population looks like was very important to me,” Streng-Schroeter says.

The data from her study underscores the urgency of making peer support more effective. Fortunately, there are many promising signs that her intervention works.

Rethinking support for survivors

After completing Streng-Schroeter’s BSS training, students showed meaningfully improved responses in how they thought about and responded to sexual-assault disclosures.

Participants who received the training reported lower levels of rape-myth acceptance—the false or harmful beliefs about what “counts” as sexual violence or who is to blame.

“The program also increased how often participants in chapters that received the training actually provided positive responses to their friends’ disclosure of sexual victimization,” Streng-Schroeter says. “And the data also appears to show that the training reduced negative responses and reduced how often participants anticipate that they will use negative responses when faced with a disclosure of sexual violence in the future.”

Streng-Schroeter believes that her community-first training model is an essential part of why it’s so effective.

Unlike large, anonymous lectures, her program is delivered in already-formed social networks. She theorizes that within peer groups where trust already exists and that experience disproportionately high levels of sexual violence, individuals may be more likely to disclose being the victim of sexual violence to one another.

"Even though there are so many victims within campus communities, students don’t necessarily know the right thing to say to someone who’s experienced this kind of violence unless they have received training."

“The social community aspect is a really important aspect of why we saw promising results with this,” Streng-Schroeter says. “Deploying the exact same training in an orientation for new students … it wouldn’t have the same effect because those friendship networks aren’t there yet.”

In other words, the best way to support survivors may be to start with the people they already lean on by giving them the tools to respond appropriately.

Healing together

With her dissertation completed and defended, Streng-Schroeter now hopes to expand the BSS program. She believes the model could scale to more chapters—and other student communities where close peer-bonds exist—with more funding.

She says, “One goal is to secure funding so I can provide this training across a whole network of a sorority, every chapter. That could impact thousands of people’s lives.”

She’s also eager to adapt the training for queer student organizations, college athletic teams and other student clubs.

Streng-Schroeter knows institutional and cultural reform takes time. But helping students become better friends, listeners and supporters can happen right now.

“People just voluntarily sharing that they felt this training was impactful really meant a lot. It made me think, ‘Okay, something good is happening here,’” Streng-Schroeter says.

As her training and research show, the most important support doesn’t always come from an office or through official channels. Often, healing begins when one person is ready to talk and another is prepared to hear them.

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CU PhD graduate Tara Streng-Schroeter's research offers a new way to support survivors of sexual violence.

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Tree rings offer clues to small-population growth

Rachel Sauer — Thu, 05 Jun 2025 15:54:21 +0000

Tree rings offer clues to small-population growth Rachel Sauer Thu, 06/05/2025 - 09:54

Daniel Long

In a recently published paper, PhD student Ellen Waddle and her coauthors provide some clarity on a decades-old problem

When researching what drives the growth of small populations, ecologists consider several factors, says Ellen Waddle, a PhD student in the University of Colorado Boulder’s Department of Ecology and Evolutionary Biology.

“There’s climate. There’s density, which can be thought of as both the total number of individuals in a population or how crowded or spread out individuals are. And then there’s stochasticity, which is this big word that just means variance” or random chance.

��Ҵ�ý�ƽ�� scientists Ellen Waddle (left), a PhD student in ecology and evolutionary biology, and Dan Doak (right), a professor of environmental studies, and their research colleagues found "that climate data alone did a pretty poor job of predicting population growth (in small tree populations)."

But whether any of these drivers matters more than the others is a question that has challenged researchers since at least the 1950s, and one that Waddle and her coauthors Mark R. Lesser, Christopher Steenbock and Dan Doak take up in a paper recently published in Ecology and Evolution.

Time and perspective

Researchers have tended to fall into opposing camps with this question, Waddle explains.

“There’s a lot of people that think if we can perfectly predict what the climate’s going to be in an area, we’re going to be able to perfectly predict how that population is going to grow through time. And then you have another set of ecologists that argue, well, it also really matters how many individuals you have in the population.”

Yet in their paper, Waddle and her coauthors come to a less divisive conclusion. By analyzing the rings of two long-lived tree species, Ponderosa pine and limber pine, “we found that climate data alone did a pretty poor job of predicting population growth. We needed to include other drivers (in our predictive models), like competitive density effects and stochasticity, to accurately reconstruct population dynamics over time.”

This means that no individual driver proved more influential than the others. They all mattered.

Which was somewhat surprising, Waddle says, considering the long timescale she and her colleagues were dealing with—many hundreds of years. (The oldest tree they sampled dates back to 1470, half a century before Queen Elizabeth I was born.)

“We're averaging over such a long timeframe that you might be tempted to think that random fluctuations and stochasticity are less important, but this sort of study highlights that that's not always true. There's a lot of uncertainty in how long it's going to take small populations to grow.”

“The most important aspect of our work, to my mind,” adds Doak, professor of environmental studies at ��Ҵ�ý�ƽ�� and head of the Doak Lab, “is showing that simplifying assumptions we often make about population growth don’t seem to hold up.”

‘The entire history of a tree’s life’

Tree rings, says Waddle, are a gold standard for measuring a tree’s history, one with which most people are familiar. The center, or pith, signifies when the tree established, or secured its roots and became capable of growing on its own, and each concentric ring around it represents a year of growth.

��Ҵ�ý�ƽ�� researchers studied small populations of Ponderosa pine (seen here) and limber pine to better understand how drivers such as climate data and competitive density affect growth. (Photo: Wikimedia Commons)

But for their study, Waddle and her coauthors used tree rings—in the form of tree cores, or centimeter-wide rods extracted from living tree trunks—a little differently.

“What we did, which has not been done often, was to core every single tree in the population,” says Waddle, which enabled her and her coauthors to get a clearer picture of how tree populations changed over time than they would have gotten coring only a handful of trees.

“Another way to put it: The tree core data basically allows us to reconstruct annual censuses of population from start (1400s-1500s) through present day because we can know exactly how many individuals were alive in each year and when each individual first established.”

The tree-core samples themselves came from Bighorn Basin, a mountain-encircled plateau region in north-central Wyoming about 500 miles from Boulder. Waddle collected some of the tree cores herself in 2017, while an undergrad at CU, for what turned out to be her first camping experience.

Yet the bulk of the core samples owe their existence to Lesser and Steenbock. Lesser alone cored around 1,100 Ponderosa pines between 2007 and 2008, in hot, sometimes tense conditions.

“We (Lesser and an undergraduate field technician) would start hiking to the first trees of the day typically around 5 a.m. to avoid the worst of the heat,” Lesser recalls. “Trekking up dry streambeds to reach the trees we would encounter multiple rattlesnakes each morning and on one occasion a mountain lion that set us on edge for the rest of the day! Many days we would core fewer than 20 trees due to the low density of the population and the ruggedness of the terrain—getting from one tree to the next often took an hour or more negotiating cliff faces, ravines and steep slopes.”

But the effort, he says, was worth it.

“Coring the trees itself was an incredibly rewarding experience—sizing up the tree to get a sense of its shape and where the pith was and then extracting the entire history of its life!”

Pick a species, any species

This research on small-population growth is no small matter, says Doak, “because all populations start small,” and “understanding what controls the growth of new populations has a new urgency as we try to predict whether wild species can shift their ranges to keep up with climate change.”

“Pick some species you care about,” says Waddle, who is currently writing her dissertation on how mountain terrain affects plant species’ ability to follow their preferred climate. “What I care about might be different than what someone else cares about, but there’s probably a species that matters to you, whether it’s a food species or your favorite animal.

“If we want to help keep those populations on the landscape, we need to know how small populations grow and how they persist.”

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In a recently published paper, PhD student Ellen Waddle and her coauthors provide some clarity on a decades-old problem.

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But how’s the atmosphere there?

Rachel Sauer — Wed, 04 Jun 2025 18:10:46 +0000

But how’s the atmosphere there? Rachel Sauer Wed, 06/04/2025 - 12:10

Rachel Sauer

In newly published research, ��Ҵ�ý�ƽ�� scientists study a rocky exoplanet outside our solar system, learning more about whether and how planets maintain atmospheres

In June 2019, Harvard astrophysicists discovered a rocky exoplanet 22 light years from Earth. Analyzing data from the Transiting Exoplanets Survey Satellite (TESS), they and other scientists around the world learned key details about the rocky exoplanet named LTT 1445 A b: It is almost 1.3 times the radius of Earth and 2.7 times Earth’s mass and orbits its M-dwarf star every 5.4 days.

What they couldn’t ascertain from those data, however, was whether LTT 1445 A b has an atmosphere, “and that’s a big general question even in our own solar system: What sets how much atmosphere a planet has?” says Zach Berta-Thompson, a University of Colorado Boulder assistant professor of astrophysical and planetary sciences. “Atmospheres matter for life, so before we go searching for life on other planets, we need to understand a very basic question—why does a planet have atmosphere or not have atmosphere?”

Pat Wachiraphan (left), a PhD student in the ��Ҵ�ý�ƽ�� Department of Astrophysical and Planetary Sciences, and Zach Berta-Thompson (right), an assistant professor in the department, collaborated with colleagues around the country to study JWST data about rocky exoplanet LTT 1445 A b.

Now, after detailed analysis of data from the James Webb Space Telescope (JWST), a lot more is known—and was recently published—about LTT 1445 A b, whether it has an atmosphere and what its atmosphere might be if it has one. ��Ҵ�ý�ƽ�� researchers partnered with astrophysicists around the country to build on previous research that ruled out a light hydrogen/helium-dominated atmosphere but could not distinguish between a cloudy atmosphere, an atmosphere composed of heavier molecules like carbon dioxide or a bare rock.

The paper’s first author, Pat Wachiraphan, a PhD student studying astrophysical and planetary sciences, Berta-Thompson and their colleagues analyzed three eclipses of LTT 1445 A b from the JWST, watching the planet disappear behind its star and measuring how much infrared light the planet emits. From this, they were able to rule out the presence of a thick carbon dioxide atmosphere like the one on Venus, which has about 100 times more atmosphere than Earth. This highlights an important aspect of science: Sometimes just as much is learned from understanding what something isn’t as from defining what it is.

“What I think should be the next step, naturally, is to ask whether we might detect an Earth-like atmosphere?” Wachiraphan says.

Not like Venus

LTT 1445 A b is one of the closest-to-Earth rocky exoplanets transiting a small star, Wachiraphan notes, and thus one of the easiest to target when studying whether and how it and similar rocky exoplanets hold atmospheres.

The JWST is more sensitive to atmospheres of transiting exoplanets around smaller stars, and LTT 1445 A b transits one of the smallest known type stars—about 20 to 30% the radius of Earth’s sun.

In November 2020, Berta-Thompson and several colleagues submitted a proposal to the Space Telescope Science Institute, the international consortium that decides where JWST is pointed and for how long, “before the telescope had even launched,” he says. “Scientists from all over the world send in anonymized proposals where we make our case for why (JWST) should spend hours looking at this particular patch of the sky and what we would be able to learn from that.

“A panel reads through the proposals, ranks them, from which a lucky 5% to 10% will be selected as the best possible scientific use of the telescope. It is such a precious resource that we care really deeply that the choices about who gets to use the telescope are made fairly; every minute of its time is accounted for.”

Rocky exoplanet LTT 1445 A b is in a three-star system; the star it orbits is an M-type star, also known as a red dwarf. (Artists' illustration: Luis L. Calçada and Martin Kornmesser/European Southern Observatory)

Studying data from three eclipses sent back by JWST, Wachiraphan, Berta-Thompson and their colleagues were able to chart thermal emission consistent with instant reradiation of incoming stellar energy from a hot planet dayside. “This bright dayside emission is consistent with emission from a dark rocky surface, and it disfavors a thick, 100-bar, Venus-like CO2 atmosphere,” the researchers noted.

“So, you can imagine that if you have a planet that is just a rock, with no atmosphere, it would be hot on day side and cold on the night side, but if it has atmosphere, then the atmosphere could redistribute heat from day to night,” Wachiraphan says.

In the case of LTT 1445 A b, “we were basically putting an infrared thermometer up to the planet’s forehead and learned its average temperature is around 500 Kelvin,” Berta-Thompson says. “The whole planet is like the inside of a hot oven, basically.

Based on the data sent back by JWST, there could be several ways to detect atmosphere on LTT 1445 A b. “We came up with an observation with this planet passing behind its star. When the planet is behind its star, we’d just get light from the star itself, but before and after the eclipse we’d get a little contribution from the planet itself, too.” Wachiraphan explains. “But you can also detect an atmosphere when a planet passes in front of its star. “The starlight coming out could pass through the atmosphere of the planet and get absorbed, and we could observe that absorption.”

More observations are currently planned for LTT 1445 A b, led by other scientists and using this complementary method of observation, Berta-Thompson says—of collecting data as the planet transits in front of its star. “There’s a lot more we can learn using different wavelengths of light and different methods that allow us to more sensitively probe these thinner atmospheres.”

Like the inside of a hot oven

One of the most fascinating questions for researchers studying exoplanets, Berta-Thopson says, is “what does it take for a planet to retain or maintain atmosphere? Learning more about that is an important step in the process toward finding a planet maybe like this one—that has a surface, has an atmosphere, is a little farther away from its star, where you can imagine it has liquid water at the surface. Then you’re asking, ‘Is this a place where life could potentially thrive? Is there a place where life is thriving?”

These questions are so interesting, in fact, that they’ve prompted the formation of the Rocky Worlds Program, with which Wachiraphan and Berta-Thompson will work closely, to support international collaboration on the next phases of exploration of rocky exoplanets using satellite data.

“Using this really magnificent telescope that is the collective effort of thousands of people over decades, let alone the broader community that found this planet, is the kind of thing that is under threat right now,” Berta-Thompson says. “All of this science and this discovery requires a really long, big, sustained investment in telescopes, in scientists, in education.”

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In newly published research, ��Ҵ�ý�ƽ�� scientists study a rocky exoplanet outside our solar system, learning more about whether and how planets maintain atmospheres.

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Rocky exoplanet LTT 1445 A b tightly orbits its parent star, which in turn orbits two other stars in a three-star system. (Artist's rendering of LTT 1445 A b: Martin Kornmesser/European Southern Observatory)

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��Ҵ�ý�ƽ�� scholars recognized for innovation in PhD research

Rachel Sauer — Mon, 05 May 2025 15:23:14 +0000

��Ҵ�ý�ƽ�� scholars recognized for innovation in PhD research Rachel Sauer Mon, 05/05/2025 - 09:23

Patrick Das and Julia Shizuyo Popham have won 2025 Mellon/ACLS Dissertation Innovation Fellowships

Two University of Colorado Boulder PhD students have won 2025 Mellon/American Council of Learned Societies (ACLS) Dissertation Innovation Fellowships.

Patrick Das, a PhD student in the Department of Linguistics, and Julia Shizuyo Popham, who is pursuing her PhD in the Department of Ethnic Studies, are among 45 PhD students from across the country who are being recognized for their innovative approaches to their dissertation research in the humanities or social sciences.

��Ҵ�ý�ƽ�� PhD students Patrick Das (left) and Julia Shizuyo Popham (right) recently won 2025 Mellon/American Council of Learned Societies Dissertation Innovation Fellowships.

The fellowships, made possible by a grant from the Mellon Foundation, recognize doctoral students “who show promise of leading their fields in important new directions,” according to the ACLS. “The fellowships are designed to intervene at the formative stage of dissertation development, before writing is advanced, and provide time and support for emerging scholars’ innovative approaches to dissertation research—practical, trans- or interdisciplinary, collaborative, critical or methodological.

“The program seeks to expand the range of research methodologies, formats and areas of inquiry traditionally considered suitable for the dissertation, with a particular focus on supporting scholars who can build a more diverse, inclusive and equitable academy.”

Das and Shizuyo Popham will receive an award of up to $52,000, consisting of a $42,000 stipend; up to $8,000 for project-related research, training, professional development and travel; and a $2,000 stipend to support external mentorship that offers new perspectives on their projects and expands their advising network.

Das is researching how geography and multilingualism shape language change in Tikhir, an endangered language of eastern Nagaland, India, near the border with Myanmar. Through spatial analysis, the project maps patterns of interaction between Tikhir and neighboring indigenous languages. Das’ findings offer new insights into how small languages evolve within complex multilingual ecologies.

Shizuyo Popham’s project, titled “Uneasy Intimacies,” interprets Japanese artist and migrant Fukunosuke Kusumi’s collection of visual art within contexts of racial disposability in the American West. By tracing Kusumi’s art through pre-World War II exclusion in Washington, interim detainment in California, indefinite incarceration in Colorado and afterlives of loss and healing, her work examines how seemingly innocuous images reveal marginalized histories, in which dispossessed subjects construct agency and even freedom via the very systems built to keep them down.

“ACLS is proud to support these fellows, who are poised to conduct groundbreaking dissertation research and broaden the audience for humanistic scholarship,” said Alison Chang, ACLS program officer in U.S. Programs. “Their innovative projects not only produce new avenues of knowledge but also inspire the evolution of doctoral education across the humanities and social sciences.”

“This fellowship will enable me to spend sustained time working with the Tikhir community to document their language on their terms,” Das said. “It supports a collaborative approach that values local knowledge and multilingual experience. By combining spatial methods with community insights, we can better understand how small languages like Tikhir are changing today.”

Shizuyo Popham noted that last week, the ACLS joined the American Historical Association and the Modern Language Association in filing a lawsuit to reverse devastating attacks on the National Endowment for the Humanities. “So, beyond the fellowship itself, I’m proud to be joining a community that is courageously fighting for intellectual freedom,” she said.

“I’m also deeply grateful to have an entire year to focus on my dissertation, which is largely about a history intertwined with mass detentions and deportations today. I’ve been studying Japanese American wartime incarceration for half a decade now, and never for me has this history felt so urgent. In these times of increasing terror, I am reminded of why the humanities matter and that to critically think and write is a freedom we must fight for every day.”

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Patrick Das and Julia Shizuyo Popham have won 2025 Mellon/ACLS Dissertation Innovation Fellowships.

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‘Kenough’: Is 'Barbie' more revolutionary for men than women?

Rachel Sauer — Fri, 07 Mar 2025 21:08:55 +0000

‘Kenough’: Is 'Barbie' more revolutionary for men than women? Rachel Sauer Fri, 03/07/2025 - 14:08

Clay Bonnyman Evans

��Ҵ�ý�ƽ�� PhD student’s paper argues that the hit film exemplifies ‘masculinity without patriarchy’ in media

M.G. Lord, author of Forever Barbie: The Unauthorized Biography of a Real Doll and co-host of the podcast LA Made: The Barbie Tapes, describes Greta Gerwig’s Oscar Award-winning, box-office behemoth Barbie as “incredibly feminist” and widely perceived as “anti-male.”

Meanwhile, conservative critics rail that the movie is “anti-man” and full of “beta males” in need of a testosterone booster. Conservative British commentator Piers Morgan called it “an assault on not just Ken, but on all men.”

��Ҵ�ý�ƽ�� PhD student Julie Estlick argues that Greta Gerwig's award-winning film Barbie is "a really good film for Ken."

But University of Colorado Boulder women and gender studies doctoral student Julie Estlick sees things differently. In her recent paper, “Ken’s Best Friend: Masculinities in Barbie,” published in Feminist Theory, she argues that the movie is “a really good film for Ken.”

On first viewing, Estlick noticed a woman nearby having a “very visceral, emotional response” to the now iconic monolog by actor America Ferrera, which begins, “It is literally impossible to be a woman.”

She wasn’t particularly moved by the speech, and walking out of the theater, she realized she didn’t see the movie as a clear-cut icon of feminism.

“I really questioned whether the film was actually about Barbie, and by extension, women, at least in the way people were claiming,” she says.

Once Barbie was available for streaming, Estlick took a closer look and arrived at a heterodox conclusion:

“Barbie is not anti-man; it is pro-man and is not necessarily a revolutionary film for women, at least not as much as it is for men,” she writes in the paper’s abstract. “This is because Barbie espouses non-hegemonic masculinity through cultural critiques that are rare to see in popular media.”

Hegemonic vs. toxic masculinity

For Estlick, “hegemonic masculinity” is a kind of stand-in for the “toxic masculinity” so often featured in media: superheroes, gangsters, vigilantes, killing machines who are also “lady killers.” Always strong, rarely emotional, such men are absurdly impermeable to harm, and sport chiseled features and perfectly sculpted abs, she says. Yet many are also “man children” whose “ultimate prize” is to have sex with a woman.

“That kind of media comes at the expense of women, works against women, and often oppresses women by sexualizing and objectifying them,” Estlick says.

In the film Barbie, the patriarchy ultimately doesn't serve the Kens any more than it does the Barbies, argues ��Ҵ�ý�ƽ�� PhD student Julie Estlick. (Photo: Warner Bros. Pictures)

Non-hegemonic masculinity is strong without being oppressive, and supportive and protective of women without regard to any quid pro quo. It allows for men to openly express emotions and vulnerability and to seek help for their mental-health struggles and emotional needs without shame, while retaining their strength, vitality and masculinity.

“It does the opposite of hegemonic masculinity,” Estlick says. “It works alongside women and doesn’t harm them in any way.”

The Kens are first represented in the movie as clueless accessories to the ruling Barbies of Barbie Land. But after Beach Ken (Ryan Gosling) and Stereotypical Barbie (Margot Robbie) find a portal to our world, Beach Ken returns and establishes a patriarchal society in which women become mindless accessories to hyper-competitive men in the thrall of hegemonic masculinity.

But ultimately, the patriarchy doesn’t serve the Kens any more than the Barbies.

“As people always say, men’s worst enemy under patriarchy isn’t women. It’s other men and their expectations, who are constantly stuffing men into boxes,” Estlick says.

Which isn’t to say that women don’t also enforce strictures of hegemonic masculinity.

“When little boys are taught to suppress emotions, little girls are watching. They are watching their fathers, and fathers onscreen, acting in certain ways,” Estlick says. “Girls internalize toxic ideologies the same ways boys do.”

Allan the exception

In Barbie, there is just one male who stands apart from Kendom: Allan, played by Michael Cera.

“Allan is positioned as queer in the film in that he is othered but not less masculine in the traditional understanding of the word,” Estlick writes. He “deviates from the conventional canon of masculinity” and “uses his masculinity for feminism and to liberate women while also protesting patriarchy.”

Allan doesn’t fit into Kendom, with or without patriarchy. As the narrator (voiced by Helen Mirren) notes, “There are no multiples of Allan; he’s just Allan.”

The character is based on a discontinued Mattel doll released in 1964, intended to be a friend to Ken. Fearing the friendship might be perceived as gay, the company swiftly removed Allan from store shelves, later replacing him with a “family pack” featuring Barbie’s best friend Midge as his wife, and a backstory that the couple had twins.

In the film, non-toxic Allan is immune to patriarchal brainwashing and sides with the Barbies in re-taking Barbie Land.

“(T)he film can be understood as a vital framework for masculinity that allows for vulnerability, emotion and heterosexual intimacy among men,” says researcher Julie Estlick. (Photo: Warner Bros. Pictures)

“Right off the bat we see (Allan) as queered from the rest of the Kens and Barbies,” Estlick says.

But Beach Ken, too, eventually senses that he’s not happy in the patriarchal society has created. In one of the movie’s final scenes, a tearfully confused Beach Ken converses with Stereotypical Barbie from a literal ledge:

“You have to figure out who you are without me,” Barbie tells him kindly. “You’re not your girlfriend. You’re not your house, you’re not your mink … You’re not even beach. Maybe all the things that you thought made you aren’t … really you. Maybe it’s Barbie and … it’s Ken.”

In other words, Barbie is rooting for Ken to claim his individuality.

“Beach Ken’s house, clothes, job and girlfriend all represent boxes that society expects men to tick, but this scene illustrates that it is okay to deviate from normative behaviors of masculinity and that manhood is not solely defined through heteronormative bonds and behaviors,” Estlick writes. And “it is acceptable for men to admit to a woman that they need help.”

Barbie is pure, candy-colored fantasy. But in our world, Estlick believes it points the way toward further non-toxic media representations of masculinity and ultimately contribute to better mental health for men trapped in a “man box” — as well as women who have borne the burden of men’s self- and societally imposed strictures on their own humanity.

“(T)he film can be understood as a vital framework for masculinity that allows for vulnerability, emotion and heterosexual intimacy among men,” she concludes. It “(opens) the door to the creation of more media that subverts societal expectations of toxic masculinity.”

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Top image: Warner Bros. Pictures

Counting hidden deaths at the U.S.’s most dangerous border crossing

Rachel Sauer — Wed, 26 Feb 2025 18:23:17 +0000

Counting hidden deaths at the U.S.’s most dangerous border crossing Rachel Sauer Wed, 02/26/2025 - 11:23

Cody DeBos

CU PhD candidate Chilton Tippin working to document migrant mortality in El Paso

With the desert sun beating down on the jagged trails of Mount Cristo Rey just outside El Paso, Texas, Chilton Tippin, a PhD candidate in cultural anthropology at the University of Colorado Boulder, wipes sweat from his brow. His backpack is weighed down with bottles of water and food—not for himself, but for the people his research group expects to find hiding in the desert.

In the distance, he sees groups of migrants who just crossed the Mexican border, many of them exhausted and injured, pursued by Border Patrol agents on horseback and in helicopters.

��Ҵ�ý�ƽ�� PhD candidate Chilton Tippin spent the summer of 2024 documenting the crisis at a deadly crossing point along the U.S.-Mexico border.

Tippin recalls this almost-daily scene on the mountain, a pilgrimage site that has become the deadliest crossing point along the U.S.-Mexico border.

He spent the summer of 2024 documenting the regional crisis. Though he originally expected to study the environmental impact of the Rio Grande, the unfolding humanitarian crisis was too important to ignore.

“My dissertation is about the Rio Grande, but since the river has been turned into a border and become heavily militarized, it has become a site for a lot of violence and death,” he says.

Yet, when Tippin tried to gather data on how many migrants were dying in the El Paso region, he ran into another problem: bureaucratic stonewalls. Many deaths, he discovered, weren’t being officially counted at all.

Without accurate data, the full scale of the crisis in El Paso is obscured, he says, and over the course of his fieldwork, Tippin saw how systemic failures, political pressure and logistical challenges combine to erase countless migrant deaths from public view.

He’s on a mission to change that.

Life and death on Mount Cristo Rey

“We would go up the mountain regularly,” Tippin recalls, “because a lot of the migrants and undocumented people trying to sneak across would be staged just on the Mexican side of the border.”

Mount Cristo Rey, the northernmost peak of the Sierra Juárez mountain range, is famous for the 29-foot-tall statue of Jesus on the Cross at its summit. With roughly two-thirds of the mountain in Texas and the rest in Mexico, it has also become a major hotspot for border crossings.

“When we would approach, often there were 20 or 30 people just sitting there in the desert with no shade, and it’d be 110 degrees (F). They would come running to us, and we would drop our backpacks and hand out 50 water bottles and any food we could carry,” Tippin says.

The migrants he and his team encountered weren’t just battling the elements. Many had endured days or weeks of travel, cartel-controlled smuggling routes and the fear of being caught and detained, or worse.

“Because of the whole process of being chased by Border Patrol in the desert, where the heat is up to 115 degrees, people are malnourished, depleted and exhausted,” Tippin says. “Then they try to swim across the river, and they’re drowning. Or they’re going out into the desert and getting lost and succumbing to dehydration and heat illness.”

Water bottles are placed beneath a religious display on the border between the United States and Mexico near El Paso, Texas. (Photo: Chilton Tippin)

The mountain itself is a paradox, both a path to safety and a trap ready to spring. The rugged terrain provides cover from Border Patrol and makes expeditions up the slopes more difficult, but it also means there’s no easy escape if something goes wrong.

“The mountain itself is such a surreal landscape,” Tippin recalls. “We often felt like we were in The Matrix or The Twilight Zone because we could be up there just kind of walking on the trails, and people are getting chased and detained and tackled.

“It’s also weird because it’s a religious place. But at the same time you’re moving through that landscape, people are running for their lives.”

The cartel’s grip on the El Paso region

For many of the migrants Tippin encountered, danger didn’t begin on the mountain. In Ciudad Juárez, just across the border from El Paso, the Juárez Cartel has taken control of border crossings, turning human smuggling into a lucrative extension of its drug trade.

“I don’t want to push this idea that the violence is just a ‘Mexico problem.’ But the reality is that people wouldn’t be forced into these cartel-run routes if they had a safe, legal way to cross the border,” Tippin says.

Cartel smugglers, known as coyotes, lead groups of migrants across the border, often charging thousands of dollars per person. In the mountains, the cartel stations lookouts to monitor movements of migrant groups and evade the Border Patrol.

“They are just posted up on the peaks, watching for agents and guiding groups through,” Tippin says. “Border Patrol would try to menace them with helicopters, but they never actually go up there because it’s too dangerous.”

Even for individuals who make it safely across the border, the ordeal often isn’t over. Many are sent right back into cartel-controlled territory, where they face violence, extortion or death.

A helicopter flies over the rugged terrain at border between the United States and Mexico near El Paso, Texas. (Photo: Chilton Tippin)

“That’s the deadly dynamic,” Tippin says. “People cross, they get pushed back and then they get extorted again. Women get assaulted. Families get separated. And they keep trying, because what choice do they have?”

The deaths no one wants to count

When the official numbers of migrant deaths didn’t match what Tippin was seeing on the ground, he quickly realized documenting the crisis would be harder than expected.

“I went through the whole summer filing open records requests, and I was told, ‘We don’t count migrants,’” he recalls. “Then when I tried to get autopsy reports, they said that if I wanted to see the records of drowning victims, it would cost over $4,000. And if I wanted a broader dataset—covering deaths in the desert as well—I got a bill for over $100,000.”

Tippin notes that U.S. Customs and Border Protection (CBP) reporting rules can be obscure, which may lead to underreporting. If a migrant drowns in the El Paso canals or is found in the desert by local first responders, the Texas National Guard or civilians, they aren’t counted in the official data. If they die in a hospital after being rescued, they also don’t make the list. Even if remains are discovered by CBP personnel but the person was not in custody, guidelines state the death isn’t reportable.

As a result, the official data can be off by hundreds—if not thousands—of deaths.

This isn’t just an oversight, Tippin notes. It’s part of a pattern. No More Deaths, a volunteer organization, exposed years of under-counted fatalities, with actual migrant deaths sometimes exceeding CBP’s reports by two to four times.

For Tippin, the answer to why this happens is simple: Acknowledging the full scale of the crisis would shed light on the deadly consequences of U.S. border policies.

“I think that the deaths go uncounted because it’s inconvenient for the whole political and bordering apparatus to have it be known that, as a consequence of their policies and their practices, hundreds of people are dying in the United States, in the deserts and in the rivers that form the border,” he says.

Fighting for the truth

Despite the resistance, Tippin and several grassroots organizations aren’t giving up the fight. They’re using the limited data they have, as well as anecdotal fieldwork, to push for policy changes, local resolutions and new initiatives aimed at tracking and preventing migrant deaths.

Clothing and water bottles left at shady spot on the United States-Mexico border near El Paso, Texas. (Photo: Chilton Tippin)

“It’s such a preventable public health trend,” he says, “and the way we attempt to address problems such as these is to gather data on them.

“We need to make what’s happening apparent and use the data to strategically implement interventions that could help reverse this alarming and tragic trend.”

One organization in Tucson, Arizona, Humane Borders, is using this approach. It works directly with the local medical examiner’s office to gather precise data on migrant deaths. That data is then used to strategically place water stations in high-risk areas.

Tippin and others want to replicate that success in El Paso, but without government cooperation, progress is slow.

“The medical examiner’s office in Tucson works with humanitarian groups,” he explains. “In El Paso, they won’t even meet with us. That’s the difference.”

But activists like Tippin aren’t waiting for permission. They continue to document deaths, advocate for policy changes and pressure local officials to increase transparency.

Recently, Tippin and his research team went before the El Paso County commissioners, pushing them to acknowledge the crisis and demand more transparency from the medical examiner’s office.

“We recently had them pass a resolution decrying all the deaths in El Paso. It’s a step in the right direction, but we need more than words—we need action,” he says.

In the El Paso region, migrants continue to suffer and die from preventable causes. The work to help them is slow, and the resistance is strong. Yet Tippin and others refuse to back down because, ultimately, it’s not about numbers.

“These aren’t just statistics,” he says. “These are people. And until we start treating them as such, nothing is going to change.”

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CU PhD candidate Chilton Tippin working to document migrant mortality in El Paso.

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Top photo: Chilton Tippin

Is the path to better mental health a walk in the park?

Rachel Sauer — Wed, 05 Feb 2025 17:03:19 +0000

Is the path to better mental health a walk in the park? Rachel Sauer Wed, 02/05/2025 - 10:03

Pam Moore

��Ҵ�ý�ƽ�� researchers Colleen Reid, Emma Rieves and their colleagues explored the potential impact of objective and perceived greenspace exposure on mental health

If you or a loved one is struggling with mental health, you’re not alone. Roughly one in every five adults experienced symptoms of anxiety or depression over the past two weeks, according to a 2022 CDC report. The good news is a better state of mind could be right in your backyard—literally.

Perceived greenspace exposure—which represents a person’s perception of the amount and quality of access to and time spent in nearby greenspace—may have a significant positive effect on certain aspects of mental health, according to new research from an interdisciplinary University of Colorado Boulder team.

Emma Rieves (left), a PhD candidate in the ��Ҵ�ý�ƽ�� Department of Geography, and Colleen Reid, an associate professor of geography, along with their research colleagues, found that perceived greenspace exposure may have a significant positive effect on certain aspects of mental health.

With Associate Geography Professor Colleen Reid at the helm, researchers from the Geography, Psychology and Neuroscience departments as well as the Institute for Behavioral Genetics and the Institute of Behavioral Science explored the link between greenspace exposure and stress, anxiety and depression.

Their study revealed a strong association between perceived greenspace exposure and reduced anxiety. Could better mental health be as simple as a walk in the park? Perhaps, says lead study author and geography PhD candidate Emma Rieves.

The relationship between greenspace and mental health “isn’t just about the greenspace that’s empirically there,” which they measured by aggregating the green pixels, representing greenspace, from aerial imagery, also known as objective green space. “The relationship is mainly influenced by aspects of green space that aren’t well captured by objective measures, such as the quality of the green space, how much time someone spends in green space and how accessible it is,” she says.

Research in the time of COVID-19

Reid started the study in late 2019, says Rieves, who arrived on campus to begin her graduate education in the fall of 2020. “It was weird,” she recalls. “But the [geography] department did a lot to facilitate interactions between students despite the restrictions that were in place at the time.”

Even before Rieves dove into the research project, she had personal experience with nature’s capacity to ease her mind, particularly during the early days of lockdown. “Being in nature definitely helped to combat some of the negative emotions you have when you’re stuck sitting in your house, doomscrolling and wiping down all your produce,” she recalls.

To determine the effect of greenspace exposure on the study’s research subjects, the team had to switch gears early in the data-collection process to account for the extra stress associated with the COVID-19 pandemic, says Rieves.

Once COVID-19 public health restrictions were in place, however, they added pandemic-specific questions to their mental health survey so that subjects could share the extent to which they were impacted by stressors such finances, resources and the possibility of infection. Their analysis could then control for pandemic-specific variables to more accurately identify the connection between mental health and greenspace exposure, says Rieves.

"If you feel like you’re surrounded by greenspace, it’s probably good for you,” says ��Ҵ�ý�ƽ�� researcher Emma Rieves. (Photo: Josephine Baran/Unsplash)

Is greenspace exposure a key to mental health?

The researchers found that perceived greenspace exposure was directly linked to reduced anxiety metrics and had a borderline statistically significant relationship with lower levels of depression metrics. Meanwhile, objective greenspace exposure bore no statistically significant association with anxiety, depression or stress.

In other words, when it came to mental health, and anxiety in particular, objective greenspace exposure mattered far less than subjects’ perceptions of greenspace exposure.

“ Based on the presence of green pixels, a vacant lot full of weeds would register as having a high green space signal. But if you were there, you might not perceive it as a superabundant green space,” says Rieves. “We found that other factors, like the quality of the environment in this example, is more important to the mental health and greenspace relationship.”

At the same time, the findings revealed a positive association between socioeconomic status and both objective and perceived greenspace, where people with higher socioeconomic status had higher perceived and objective greenspace exposure.

The takeaway

While no one is promising that a walk in the woods is a magic bullet, getting out in nature is never a bad idea, says Rieves. And no matter what the pixels indicate, or how many minutes a day you spend around trees, the data indicate that people’s perceptions of their own greenspace exposure are important to unlocking better mental health, says Rieves.

“This study doesn’t prescribe any specific level of greenspace exposure needed to reap its mental health benefits, but if you feel like you’re surrounded by greenspace, it’s probably good for you.”

��Ҵ�ý�ƽ�� scientists Naomi Friedman and Samantha Freis contributed to this research.

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��Ҵ�ý�ƽ�� researchers Colleen Reid, Emma Rieves and their colleagues explored the potential impact of objective and perceived greenspace exposure on mental health.

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Studying the ‘cause of causes’ affecting cardiovascular health

Rachel Sauer — Tue, 21 Jan 2025 15:08:47 +0000

Studying the ‘cause of causes’ affecting cardiovascular health Rachel Sauer Tue, 01/21/2025 - 08:08

Chris Quirk

��Ҵ�ý�ƽ�� researchers find that socioeconomic status is a key indicator of heart health

Cardiovascular disease, the leading cause of death in the United States, significantly affects those of lower socioeconomic status. In addition, members of historically marginalized groups—including Black, Indigenous and Asian populations—suffer disproportionately. Therefore, public health advocates and policy makers need to make extra efforts to reach these populations and find ways to reduce their risk of cardiovascular disease.

These are the findings of researchers Sanna Darvish and Sophia Mahoney, PhD candidates in the University of Colorado Boulder Department of Integrative Physiology. Their recent paper on socioeconomic status and arterial aging—written with ��Ҵ�ý�ƽ�� co-authors Ravinandan Venkatasubramanian, Matthew J. Rossman, Zachary S. Clayton and Kevin O. Murray—was published in the Journal of Applied Physiology.

Researchers Sanna Darvish (left) and Sophia Mahoney (right), PhD candidates in the ��Ҵ�ý�ƽ�� Department of Integrative Physiology advocate for making extra efforts to reach historically marginalized populations and find ways to reduce their risk of cardiovascular disease.

Darvish and Mahoney conducted a literature review of cardiovascular disease, looking specifically at how it affects various demographics. Their focus was on two physiological features that are predictors of cardiovascular issues: endothelial dysfunction—a failure of the lining of blood vessels that can cause a narrowing of the arteries—and stiffening of arteries.

“It’s pretty well established that individuals of lower socioeconomic status have increased risk for many chronic diseases, but our lab focuses on the physiological and cellular mechanisms contributing to that increased risk,” Darvish explains. “We’re looking at what studies have been conducted, looking at blood vessel dysfunction, arterial dysfunction in these marginalized groups that then will predict their risk for cardiovascular disease.”

Exercise as therapy

Beyond the clinical findings, Darvish and Mahoney cite four social determinants of health regarding cardiovascular disease across ethnic and racial groups: environmental factors, like proximity to pollution or access to green spaces; psychological and social factors, such as stress or structural racism; health care access; and socioeconomic status.

While each of the four has different facets that contribute to overall cardiovascular health, the authors found that socioeconomic status was the “cause of causes,” and thus the most important indicator to examine in their goal of recommending effective therapies.

“It became clear to us that socioeconomic status really played a role in every single aspect of social determinants of health,” says Mahoney. “So, our paper naturally centered around socioeconomic status as we realized that it was the most integrated and affected the rest of the determinants of health.”

To help overcome the barriers to better cardiovascular health among those in lower socioeconomic groups, Darvish and Mahoney recommend exercise.

“Exercise is well established as first line of defense, especially aerobic exercise,” says Mahoney. “It’s easy for us to say that in Colorado, but there are plenty of barriers to people everywhere who do not have access to resources.”

“Exercise is well established as first line of defense, especially aerobic exercise,” says ��Ҵ�ý�ƽ�� researcher Sophia Mahoney. “It’s easy for us to say that in Colorado, but there are plenty of barriers to people everywhere who do not have access to resources.”

One option the researchers propose is high-intensity interval training (HIIT), which packs a robust aerobic effort into workouts as brief as five or 10 minutes. The authors also recommend inspiratory muscle strength training (IMST), during which users breathe into a simple handheld device that inhibits air flow and get a simulated aerobic workout that also strengthens the diaphragm. Previous research has demonstrated that just a few minutes of IMST therapy a day can reduce blood pressure and the risk of cardiovascular disease.

Reducing research barriers

One thing Darvish and Mahoney hope their study will do is galvanize researchers to include more diverse populations in their research. While investigating the existing literature for their review, the two were dismayed to find few studies that included or focused on populations from the lower socioeconomic echelons.

There are structural reasons for that, Darvish explains. Time is an issue, as those lower on the socioeconomic ladder often work more hours and have more demands on their non-work time. In addition, transportation can be an obstacle, as research facilities may not be near neighborhoods with more diverse populations. “We pay our participants an appropriate amount for their participation, but not all clinical trials do,” Darvish says.

“Another thing we are doing is instituting a lift service through our lab, to drive people in from their homes in Denver to our lab in Boulder, and we hope this will help improve access for more people to participate.”

Language barriers can be another impediment, as all release forms and study literature would need to be translated for those who don’t speak English. Darvish and Mahoney say it is important that researchers work to overcome these structural barriers. “Our lab is working to do all we can to reduce biases, and include these diverse populations,” says Mahoney. “We need to practice what we preach and start with ourselves.”

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��Ҵ�ý�ƽ�� researchers find that socioeconomic status is a key indicator of heart health.

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Learning the recipe for grizzly gourmet

Rachel Sauer — Thu, 12 Dec 2024 14:30:00 +0000

Learning the recipe for grizzly gourmet Rachel Sauer Thu, 12/12/2024 - 07:30

Doug McPherson

��Ҵ�ý�ƽ�� anthropology PhD candidate Sabrina Bradford has been learning what’s on the menu for grizzlies in Montana

If you’re ever heading to Montana’s backcountry, you’d be hard pressed to find a better guide than Sabrina Bradford, a University of Colorado Boulder PhD candidate in biological anthropology.

Bradford has spent more than a decade in the area’s countryside, mostly on horseback, studying conflict between humans and wildlife, social-ecological systems, livestock damage and the grizzly-bear diet.

Lately she’s been getting noticed for that last item.

Anthropology PhD candidate Sabrina Bradford (left) wrote Grizzly Bear Foods: Reference Guide to the Plants, Animals, and Fungi in the Montana Grizzly Bear's Diet, published by Montana Fish, Wildlife and Parks.

This fall, Montana Fish, Wildlife and Parks published her new 100-page book, Grizzly Bear Foods: Reference Guide to the Plants, Animals, and Fungi in the Montana Grizzly Bear's Diet, which will be part of the state’s “bear aware” education program for the public in 2025.

“I saw a lot about how grizzlies used the landscape,” says Bradford, who sometimes has ridden 20 miles a day in the backcountry doing research and working as a guide and bear education specialist. “I took plenty of photos of grizzly bear signs―areas where it looked like a tiller had rolled through the soil, over rocks and torn up trees. I wanted people to be able to see the landscape similar to the way I did. It’s really important to me that the public understands what bears are actually doing on the landscape.”

Of course, that landscape is a massive buffet for grizzlies, whose four food groups are plants, animals, fungi and trash from humans. A few specific examples of their diet: grasses, shrubs, seeds and fruits of trees, mushrooms, ducks, bird eggs, trout, salmon, squirrels, beaver, moose, bison, elk, deer, bighorn sheep, ants, termites and bees.

Bradford, who graduates this month, says grizzlies serve an important role as seed dispersers within the ecosystem there, and many of the shrubs grizzlies eat produce berries (e.g. huckleberry, raspberry, serviceberry, grouse whortleberry, buffaloberry) that are dispersed via scat.

‘Pretty cool animals’

“Bears are pretty cool animals,” Bradford says. “They have incredible spatiotemporal memory [they can recall where and when food was presented], and they use social learning. Mom teaches her cubs food acquisition strategies. This is key for people to understand, those who question why cubs were removed from an area as well as when the mother is removed for dumpster diving. She’s just teaching her cubs how to access a reliable food resource.”

Bears are also not above stealing other animals’ food stash, an activity called kleptoparasitism.

Grizzly bears sometimes steal other animals' food stashes, an act called kleptoparasitism. (Photo: Montana Fish, Wildlife and Parks)

“People who hike in grizzly country with their dogs off the leash say their dog will protect them. That doesn’t really work,” Bradford explains. “Kleptoparasitism is one of the food-source acquisition strategies grizzlies use, and they’ll steal food from packs of wolves. Wolves will yield to grizzly bears, and your dog is nowhere near as tough as a pack of wolves.”

Bradford says while she’s seen many grizzlies, she’s never had to use her bear spray. Her advice to avoid attacks: “Realize that the human voice is the most powerful deterrent out there, not radios or bear bells. Talk loud in areas of low visibility so the bears can hear you coming. It’s critical to understand that you shouldn’t surprise a bear, that they’ll do anything to protect their cubs. And be aware of magpies or ravens in the forest because they’re a sign you might be hiking up on a carcass.”

And while grizzlies’ sense of hearing is strong, their sense of smell is astounding. “The size of the olfactory bulb, the part of the brain that processes scent information in grizzlies, is more than five times larger than humans’ olfactory bulb.” She advises people to sleep in clothes they haven’t cooked in: “Just because you can’t smell food on your clothes doesn’t mean bears can’t.”

Bradford adds that there is a common misunderstanding that grizzlies are looking to wipe out the first person they see and that livestock producers want to kill all grizzlies.

“That isn’t true,” she says. “Yes, livestock loss to grizzlies does occur, but ranchers I interviewed said over 80% of the grizzlies out there never cause any trouble. And other ranchers reported that it’s common to see grizzlies grazing grass in the same fields that the cattle use.”

She recalls one rancher telling her, “’Wildlife is embedded deep in our traditions. We don't hate grizzly bears; they're amazing animals. I don't want to give up all I have to the grizzly bear but I'm willing to share it.’”

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��Ҵ�ý�ƽ�� anthropology PhD candidate Sabrina Bradford has been learning what’s on the menu for grizzlies in Montana.

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