Less Surface Sea Ice Melt in the CESM2 Improves Arctic Sea Ice Simulation With Minimal Non-Polar Climate Impacts.
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Kay, Jennifer E.
Holland, Marika M.
Bailey, David A.
DuVivier, Alice K.
Smith, Madison M.
Webster, Melinda A.
Rogers, Keith B.
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This study isolates the influence of sea ice mean state on pre-industrial climate and transient 1850-2100 climate change within a fully coupled global model: The Community Earth System Model version 2 (CESM2). The CESM2 sea ice model physics is modified to increase surface albedo, reduce surface sea ice melt, and increase Arctic sea ice thickness and late summer cover. Importantly, increased Arctic sea ice in the modified model reduces a present-day late-summer ice cover bias. Of interest to coupled model development, this bias reduction is realized without degrading the global simulation including top-of-atmosphere energy imbalance, surface temperature, surface precipitation, and major modes of climate variability. The influence of these sea ice physics changes on transient 1850-2100 climate change is compared within a large initial condition ensemble framework. Despite similar global warming, the modified model with thicker Arctic sea ice than CESM2 has a delayed and more realistic t.....
JournalJournal of Advances In Modeling Earth Systems
Sustainable Development Goals (SDG)14.a
Essential Ocean Variables (EOV)Sea ice
Spatial CoverageArctic Ocean
CitationKay, J. E., DeRepentigny, P., Holland, M. M., Bailey, D. A., DuVivier, A. K., et al. (2022) Less Surface Sea Ice Melt in the CESM2 Improves Arctic Sea Ice Simulation With Minimal Non-Polar Climate Impacts. Journal of Advances in Modeling Earth Systems, 14:2679, 19pp. DOI: https://doi.org/10.1029/2021MS002679
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