Fix an issue in snow initialization#1438
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smileMchen wants to merge 1 commit intoMPAS-Dev:release-v8.4.0from
Open
Fix an issue in snow initialization#1438smileMchen wants to merge 1 commit intoMPAS-Dev:release-v8.4.0from
smileMchen wants to merge 1 commit intoMPAS-Dev:release-v8.4.0from
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Author
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The upper two panels show initial snow before and after the bug fix ( initial time is 2024-02-01_00) |
mgduda
reviewed
Apr 2, 2026
mgduda
requested changes
Apr 2, 2026
This commit fixes an issue in snow initialization over the Arctic Ocean and other areas covered by seaice. Snow water equivalent (as well as snow depth and snow cover) in the initial conditions of MPAS was set to zero over sea ice areas. This leads to a significant warm bias of skintemp during model integration. When MPAS is initialized in winter, the simulated conditions over polar regions become physically unrealistic. This commit corrects snow initialization, making it physically reasonable over Arctic Ocean and other areas covered by seaice in winter.
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@smileMchen When testing the changes in this PR with a global 60-km mesh using ERA5 data valid on 2025-01-01, it looks like snow over land points is getting removed. In the screenshot below, the top panel is the |
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This PR fixes the bug in snow initialization over Arctic Ocean and other areas covered by seaice.
Snow water equivalent (as well as snow depth and snow cover) in the initial conditions of MPAS is currently set to zero over sea ice areas. This leads to a significant warm bias of skintemp during model integration. When MPAS is initialized in winter, the simulated conditions over polar regions become physically unrealistic.
This PR corrects snow initialization, making it physically reasonable over Arctic Ocean and other areas covered by seaice in winter.