Details:

Journal Title:
Climate Dynamics
Personal Author:
Luo, Rui ; Ding, Qinghua ; Baxter, Ian ; Chen, Xianyao ; Wu, Zhiwei ; ... More +
Luo, Rui ; Ding, Qinghua ; Baxter, Ian ; Chen, Xianyao ; Wu, Zhiwei ; Bushuk, Mitchell ; Wang, Hailong Less -
NOAA Program & Office:
OAR (Oceanic and Atmospheric Research)
Description:
Downwelling longwave radiation (DLR) driven by the atmospheric and cloud conditions in the troposphere is suggested to be a dominant factor to determine the summertime net surface energy budget over the Arctic Ocean and thus plays a key role to shape the September sea ice. We use reanalyses and the self-organizing map (SOM) method to distinguish CMIP6 model performance in replicating the observed strong atmosphere-DLR connection. We find all models can reasonably simulate the linkage between key atmosphere variables and the clear sky DLR but behave differently in replicating the atmosphere-DLR connection due to cloud forcing. In ERA5 and strongly coupled models, tropospheric high pressure is associated with decreased clouds in the mid- and high-levels and increased clouds near the surface. This out-of-phase structure indicates that DLR cloud forcing is nearly neutral, making the clear sky DLR more important to bridge JJA circulation to late-summer sea ice. In MERRA-2 and weakly coupled models, tropospheric clouds display a vertically homogeneous reduction; the cloud DLR is thus strongly reduced due to the cooling effect, which partially cancels out the clear sky DLR and makes the total DLR less efficient to translate circulation forcing to sea ice. The differences of cloud vertical distribution in CMIP6 appear to be differentiated by circulation related relative humidity. Therefore, a better understanding of the discrepancy of different reanalyses and remote sensing products is critical to comprehensively evaluate simulated interactions among circulation, clouds, sea ice and energy budget at the surface in summer.
Keywords:
[+]
Atmospheric Science
Source:
Climate Dynamics, 61(3-4), 1973-1994
DOI:
https://doi.org/10.1007/s00382-023-06785-9
ISSN:
0930-7575;1432-0894;
Format:
PDF
Publisher:
Springer Science and Business Media LLC
Document Type:
Journal Article
Funding:
Grant no. NA19OAR4310281
License:
https://creativecommons.org/licenses/by/4.0/
Rights Information:
CC BY
Compliance:
Library
Main Document Checksum:
[+]
urn:sha256:19e9991574771b9ff38ba1ad4598fad6cdf74f9b69235586924e92a005990eb6
Download URL:
https://repository.library.noaa.gov/view/noaa/58637/noaa_58637_DS1.pdf
File Type:

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