Atmospheric River Contributions to Ice Sheet Hydroclimate at the Last Glacial Maximum

Author:

Skinner Christopher B.1ORCID,Lora Juan M.2ORCID,Tabor Clay3ORCID,Zhu Jiang4ORCID

Affiliation:

1. Department of Environmental, Earth and Atmospheric Sciences University of Massachusetts Lowell Lowell MA USA

2. Department of Earth and Planetary Sciences Yale University New Haven CT USA

3. Department of Geosciences University of Connecticut Storrs CT USA

4. Climate and Global Dynamics Laboratory NCAR Boulder CO USA

Abstract

AbstractAtmospheric rivers (ARs) are an important driver of surface mass balance over today's Greenland and Antarctic ice sheets. Using paleoclimate simulations with the Community Earth System Model, we find ARs also had a key influence on the extensive ice sheets of the Last Glacial Maximum (LGM). ARs provide up to 53% of total precipitation along the margins of the eastern Laurentide ice sheet and up to 22%–27% of precipitation along the margins of the Patagonian, western Cordilleran, and western Fennoscandian ice sheets. Despite overall cold conditions at the LGM, surface temperatures during AR events are often above freezing, resulting in more rain than snow along ice sheet margins and conditions that promote surface melt. The results suggest ARs may have had an important role in ice sheet growth and melt during previous glacial periods and may have accelerated ice sheet retreat following the LGM.

Funder

National Science Foundation

National Center for Atmospheric Research

Publisher

American Geophysical Union (AGU)

Subject

General Earth and Planetary Sciences,Geophysics

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