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���Ҵ�ý�ƽ������ researcher Ivy Tan leads a project recently funded by Ocean Visions that aims to assess whether mixed-phase cloud thinning is a viable method for cooling the Arctic

Ivy Tan, a University of Colorado Boulder assistant professor of physics, recently was awarded funding from Ocean Visions for a project she leads that is assessing whether mixed-phase cloud thinning is a viable method for cooling the Arctic and restoring sea ice.

Tan’s project is one of six funded by , a nonprofit ocean conservation organization pursuing solutions to counter and reverse climate impacts on ocean health. The selected projects are being funded through Ocean Visions’ , which was created to identify, prioritize and support research on cutting-edge ideas to slow the loss of Arctic sea ice.

“Arctic summer sea ice is a critical foundation of the global ocean and climate system, and its rapid loss is creating a series of severe risks to nature and people across the planet,” says Brad Ack, Ocean Visions CEO. “These research projects, and others to come, are intended to help answer the glaring question: Is there anything else we can do to forestall these potentially irreversible outcomes?” ��

Ivy Tan, a University of Colorado Boulder assistant professor of physics, recently was awarded funding from Ocean Visions for a project she leads that is assessing whether mixed-phase cloud thinning is a viable method for cooling the Arctic and restoring sea ice.

“This support from Ocean Visions will allow us to better understand the radiative influence of Arctic clouds on the rapidly warming Arctic by spectrally fingerprinting the far infrared radiative signature of clouds using state-of-the-art technology,” Tan says.��

Tan and her research colleagues—Sebastian Schmidt, a ���Ҵ�ý�ƽ������ professor of atmospheric and oceanic sciences, Michael Diamond at Florida State University and Colten Peterson with the NASA Goddard Space Flight Center—are developing a new, satellite-based Arctic cloud observation product using recently launched satellites with unprecedented routine measurements of far-infrared radiation (NASA’s PREFIRE CubeSats), as well as collocated radar, LiDAR and imager instruments.

“We will compare the satellite observations to those made with ESA/JAXA’s recently launched EarthCARE satellite and an aircraft (as part of NASA’s ARCSIX campaign),” Tan and her colleagues explain. “These comparisons will be used to produce and validate an algorithm that provides information on cloud properties and their radiative effects on the Arctic surface on a broad spatial scale. Our framework will uniquely take into account the influence of the vertical thermal stratification of the Arctic atmosphere helping us to determine where and when mixed-phase cloud seeding would, or would not, have potential as a climate intervention strategy.”

Among their aims is to help make mixed-phase cloud thinning a more viable method for cooling the Arctic and restoring sea ice. For this to happen, however, “there would need to be enough of the right type of cloud present to be thinned by seeding (clouds containing supercooled liquid water), at the right time (polar night), to produce the desired climate forcing (cooling). Unfortunately, accurately measuring these clouds, especially at night, is very challenging with current satellite products,” the researchers explain.

Ocean Visions selected the six projects through a competitive process, including review by an independent international expert panel. The research to be conducted will provide the foundation for future work, if warranted, to further advance knowledge and address ecological, social and ethical dimensions, as well as develop guidance on safeguards or stage gates for future research, according to Ocean Visions.

“The research supported through the Arctic Sea Ice Restoration Research Fund prioritizes scientific merit, interdisciplinary approaches, and careful risk assessment through a rigorous review,” says Dr. Ginny Selz, Ocean Visions senior program director. “We are excited to watch this research progress and see how it expands our understanding of potential approaches to protect and restore��.”

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