Boisvert, LinetteGrecu, MirceaShie, Chung-Lin2021-11-052021-11-052021-10-10Boisvert, Linette; Grecu, Mircea; Shie, Chung-Lin; Investigating Wintertime GPM-IMERG Precipitation in the North Atlantic; Geophysical Research Letters, 48, 20, 10 October, 2021; https://doi.org/10.1029/2021GL095391https://doi.org/10.1029/2021GL095391http://hdl.handle.net/11603/23248Abstract Precipitation is expected to increase in a warming climate, which can have profound impacts on local and global hydrologic budgets. However, the precipitation in high latitudes remains highly uncertain. We compare wintertime precipitation in the North Atlantic using GPM-IMERG, GPCP, MERRA-2 and ERA5 between 2000–2019 and show that while interannual variations between products are similar, large differences in magnitudes exist, specifically in areas of higher precipitation where Integrated Multi-satellitE Retrievals for GPM (IMERG) produces an excess of 2 mm day−1. EOF analysis demonstrates observations and reanalyses show similar spatial variability in the most dominant precipitation patterns and are highly correlated (r = −0.6) with the North Atlantic Oscillation. Analysis of IMERG extreme precipitation further shows that it is most densely populated in this same area where large discrepancies in magnitudes between products exist. IMERG extreme precipitation was found to drive the monthly anomalies. Future work needs to be focused on extreme precipitation characteristics, patterns and the driving atmospheric factors. Plain Language Summary Global precipitation dynamics and distributions are expected to change with a warming climate and these changing will have a large impact for the inhabitants of Earth. Precipitation is also expected to change at high latitudes (e.g., the Polar Regions), however precipitation in these regions still remain a challenge to measure and estimate. When looking at satellite estimates compared with modeled precipitation in the North Atlantic in the winter for 2000–2019, it was found that the products show similar precipitation patterns from year-to-year, but NASA Integrated Multi-satellitE Retrievals for GPM (IMERG) satellite estimates are much larger in areas of the North Atlantic storm track. These large differences are driven by extreme precipitation events which drive the precipitation averages.2 filesen-USThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.©2018. American Geophysical Union. All Rights ReservedAccess to this item will begin on 2022-10-04Text