LGM Paleoclimate Constraints Inform Cloud Parameterizations and Equilibrium Climate Sensitivity in CESM2

Zhu, Jiang; Otto‐Bliesner, Bette L.; Brady, Esther C.; Gettelman, Andrew; Bacmeister, Julio T.; Neale, Richard B.; Poulsen, Christopher J.; Shaw, Jonah K.; McGraw, Zachary S.; Kay, Jennifer E.

doi:10.1029/2021ms002776

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LGM Paleoclimate Constraints Inform Cloud Parameterizations and Equilibrium Climate Sensitivity in CESM2

2022
By Zhu, Jiang ; Otto‐Bliesner, Bette L. ; Brady, Esther C. ; ...
Source: Journal of Advances in Modeling Earth Systems, 14(4)

[PDF-1.26 MB]

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Details:

Journal Title:

Journal of Advances in Modeling Earth Systems
Personal Author:

Zhu, Jiang ; Otto‐Bliesner, Bette L. ; Brady, Esther C. ; Gettelman, Andrew ; Bacmeister, Julio T. ; ... More +

Zhu, Jiang ; Otto‐Bliesner, Bette L. ; Brady, Esther C. ; Gettelman, Andrew ; Bacmeister, Julio T. ; Neale, Richard B. ; Poulsen, Christopher J. ; Shaw, Jonah K. ; McGraw, Zachary S. ; Kay, Jennifer E. Less -
NOAA Program & Office:

CIRES (Cooperative Institute for Research in Environmental Sciences)
Description:

The Community Earth System Model version 2 (CESM2) simulates a high equilibrium climate sensitivity (ECS > 5°C) and a Last Glacial Maximum (LGM) that is substantially colder than proxy temperatures. In this study, we examine the role of cloud parameterizations in simulating the LGM cooling in CESM2. Through substituting different versions of cloud schemes in the atmosphere model, we attribute the excessive LGM cooling to the new CESM2 schemes of cloud microphysics and ice nucleation. Further exploration suggests that removing an inappropriate limiter on cloud ice number (NoNimax) and decreasing the time-step size (substepping) in cloud microphysics largely eliminate the excessive LGM cooling. NoNimax
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Environmental Chemistry General Earth And Planetary Sciences Global And Planetary Change
Source:

Journal of Advances in Modeling Earth Systems, 14(4)
DOI:

https://doi.org/10.1029/2021ms002776
ISSN:

1942-2466;1942-2466;
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PDF
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American Geophysical Union (AGU)
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Journal Article
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https://creativecommons.org/licenses/by/4.0/
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CC BY
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urn:sha256:7350861fe3e135dc2865a70fcf21b65e40e5a7845381d850f2d436f2c5cf7b18
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https://repository.library.noaa.gov/view/noaa/55242/noaa_55242_DS1.pdf
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