https://doi.org/10.5194/tc-2019-69 Preprint. Discussion started: 12 June 2019 c Author(s) 2019. CC BY 4.0 License. Influence of Sea Ice Anomalies on Antarctic Precipitation Using Source Attribution Hailong Wang1*, Jeremy Fyke2,3, Jan Lenaerts4, Jesse Nusbaumer5,6, Hansi Singh1, David Noone7, and Philip Rasch1 (1) Pacific Northwest National Laboratory, Richland, WA 5 (2) Los Alamos National Laboratory, Los Alamos, NM (3) Associated Engineering, Vernon, British Columbia, Canada (4) Department of Atmospheric and Oceanic Sciences, University of Colorado at Boulder, Boulder, CO (5) NASA Goddard Institute for Space Studies, New York, NY (6) Center for Climate Systems Research, Columbia University, New York, NY 10 (7) Oregon State University, Corvallis, OR *Correspondence to:
[email protected] 1 https://doi.org/10.5194/tc-2019-69 Preprint. Discussion started: 12 June 2019 c Author(s) 2019. CC BY 4.0 License. Abstract We conduct sensitivity experiments using a climate model that has an explicit water source tagging capability forced by prescribed composites of sea ice concentrations (SIC) and corresponding SSTs to understand the impact of sea ice anomalies on regional evaporation, moisture transport, and source– 5 receptor relationships for precipitation over Antarctica. Surface sensible heat fluxes, evaporation, and column-integrated water vapor are larger over Southern Ocean (SO) areas with lower SIC, but changes in Antarctic precipitation and its source attribution with SICs reflect a strong spatial variability. Among the tagged source regions, the Southern Ocean (south of 50°S) contributes the most (40%) to the Antarctic total precipitation, followed by more northerly ocean basins, most notably the S.