Tracing the source of ENSO simulation differences to the atmospheric component of two CGCMs

Yanli Tang; Lijuan Li; Wenjie Dong; Bin Wang

doi:10.1002/asl.637

Tracing the source of ENSO simulation differences to the atmospheric component of two CGCMs

Yanli Tang
, Lijuan Li
, Wenjie Dong
, Bin Wang

Computational Earth Sciences Group

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

To explore why the Community Earth System Model (CESM) exhibits too strong El Niño-Southern Oscillation (ENSO), its atmospheric component is replaced by another Atmospheric General Circulation Model (AGCM). Differences among the two simulations and another 'parent' model are then analyzed with reference to their underlying mechanisms. The results indicate that too large ENSO amplitude in the CESM is reduced to half by the new AGCM, mainly due to shortwave radiation feedback. Weaker shortwave radiation feedback in the CESM is found to be closely related to the too negative feedbacks of the cloud fraction and cloud liquid amount in the lower layers.

Original language	English
Pages (from-to)	155-161
Number of pages	7
Journal	Atmospheric Science Letters
Volume	17
Issue number	2
DOIs	https://doi.org/10.1002/asl.637
State	Published - Feb 1 2016

Funding

We thank Nan Ding and Wei Xue for help in establishing the CESM-GAMIL2. This work was funded by the National Natural Science Foundation of China (No. 41330527) and the Chinese Academy of Sciences Strategic Priority Research Program (Grant No. XDA05110304).

Keywords

CESM
CESM-GAMIL2
ENSO amplitude
Shortwave radiation feedback

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10.1002/asl.637

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title = "Tracing the source of ENSO simulation differences to the atmospheric component of two CGCMs",

abstract = "To explore why the Community Earth System Model (CESM) exhibits too strong El Ni{\~n}o-Southern Oscillation (ENSO), its atmospheric component is replaced by another Atmospheric General Circulation Model (AGCM). Differences among the two simulations and another 'parent' model are then analyzed with reference to their underlying mechanisms. The results indicate that too large ENSO amplitude in the CESM is reduced to half by the new AGCM, mainly due to shortwave radiation feedback. Weaker shortwave radiation feedback in the CESM is found to be closely related to the too negative feedbacks of the cloud fraction and cloud liquid amount in the lower layers.",

keywords = "CESM, CESM-GAMIL2, ENSO amplitude, Shortwave radiation feedback",

author = "Yanli Tang and Lijuan Li and Wenjie Dong and Bin Wang",

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year = "2016",

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doi = "10.1002/asl.637",

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volume = "17",

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T1 - Tracing the source of ENSO simulation differences to the atmospheric component of two CGCMs

AU - Tang, Yanli

AU - Li, Lijuan

AU - Dong, Wenjie

AU - Wang, Bin

PY - 2016/2/1

Y1 - 2016/2/1

N2 - To explore why the Community Earth System Model (CESM) exhibits too strong El Niño-Southern Oscillation (ENSO), its atmospheric component is replaced by another Atmospheric General Circulation Model (AGCM). Differences among the two simulations and another 'parent' model are then analyzed with reference to their underlying mechanisms. The results indicate that too large ENSO amplitude in the CESM is reduced to half by the new AGCM, mainly due to shortwave radiation feedback. Weaker shortwave radiation feedback in the CESM is found to be closely related to the too negative feedbacks of the cloud fraction and cloud liquid amount in the lower layers.

AB - To explore why the Community Earth System Model (CESM) exhibits too strong El Niño-Southern Oscillation (ENSO), its atmospheric component is replaced by another Atmospheric General Circulation Model (AGCM). Differences among the two simulations and another 'parent' model are then analyzed with reference to their underlying mechanisms. The results indicate that too large ENSO amplitude in the CESM is reduced to half by the new AGCM, mainly due to shortwave radiation feedback. Weaker shortwave radiation feedback in the CESM is found to be closely related to the too negative feedbacks of the cloud fraction and cloud liquid amount in the lower layers.

KW - CESM

KW - CESM-GAMIL2

KW - ENSO amplitude

KW - Shortwave radiation feedback

UR - https://www.scopus.com/pages/publications/84956732497

U2 - 10.1002/asl.637

DO - 10.1002/asl.637

M3 - Article

AN - SCOPUS:84956732497

SN - 1530-261X

VL - 17

SP - 155

EP - 161

JO - Atmospheric Science Letters

JF - Atmospheric Science Letters

IS - 2

ER -

Tracing the source of ENSO simulation differences to the atmospheric component of two CGCMs

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