ENSO sensitivity to convective triggers in a coupled GCM
-
Title
- ENSO sensitivity to convective triggers in a coupled GCM
-
Author(s)
- 장연수; 국종성; 김동훈; 김영호
- KIOST Author(s)
- Jang, Yeonsoo(장연수)
-
Alternative Author(s)
- 장연수; 국종성; 김영호
-
Publication Year
- 2010-10-14
-
Abstract
- A series of 100-year long simulations is performed using GFDL CM2.1, by varying the Tokioka parameter, which is the minimum entrainment rate threshold in the cumulus parameterization of a GCM. It is found that the magnitude of ENSO simulated in this model increases with the Tokioka parameter. Changing the Tokioka parameter alters both the Pacific-Ocean mean state and ENSO variability, which are tightly coupled. When a large Tokioka parameter is used, deep convection is highly suppressed; thereby the amount of high cloud is reduced. With less high cloud in the western Pacific under large Tokioka parameter, the east-west asymmetry in the Pacific-basin mean state is reduced. The atmospheric responses to ENSO-related SST forcing are shifted eastward, which leads to stronger ENSO variability. It is suggested that eastward shift of the atmospheric response is associated with east-west asymmetry and resultant wetness over the eastern Pacific. Our results suggest that the east-west asymmetry is one of the metrics for ENSO amplitude in coupled climate models.
-
URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/28702
-
Bibliographic Citation
- 2010년 한국기상학회 가을 학술대회, pp.112 - 113, 2010
-
Publisher
- 한국기상학회
-
Type
- Conference
-
Language
- English
- Files in This Item:
-
There are no files associated with this item.
Items in ScienceWatch@KIOST are protected by copyright, with all rights reserved, unless otherwise indicated.