ENSO amplitude changes due to climate change projections in different coupled models SCIE SCOPUS

Cited 40 time in WEB OF SCIENCE Cited 40 time in Scopus
Title
ENSO amplitude changes due to climate change projections in different coupled models
Author(s)
Yeh, Sang-Wook; Kirtman, Ben P.
Publication Year
2007-01
Abstract
Four climate system models are chosen here for an analysis of ENSO amplitude changes in 4 x CO2 climate change projections. Despite the large changes in the tropical Pacific mean state, the changes in ENSO amplitude are highly model dependant. To investigate why similar mean state changes lead to very different ENSO amplitude changes, the characteristics of sea surface temperature anomaly (SSTA) variability simulated in two coupled general circulation models (CGCMs) are analyzed: the Meteorological Research Institute (MRI) and Geophysical Fluid Dynamics Laboratory (GFDL) models. The skewed distribution of tropical Pacific SSTA simulated in the MRI model suggests the importance of nonlinearities in the ENSO physics, whereas the GFDL model lies in the linear regime. Consistent with these differences in ENSO regime, the GFDL model is insensitive to the mean state changes, whereas the MRI model is sensitive to the mean state changes associated with the 4 x CO2 scenario. Similarly, the low-frequency modulation of ENSO amplitude in the GFDL model is related to atmospheric stochastic forcing, but in the MRI model the amplitude modulation is insensitive to the noise forcing. These results suggest that the understanding of changes in ENSO statistics among various climate change projections is highly dependent on whether the model ENSO is in the linear or nonlinear regime.
ISSN
0894-8755
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/4746
DOI
10.1175/JCLI4001.1
Bibliographic Citation
JOURNAL OF CLIMATE, v.20, no.2, pp.203 - 217, 2007
Publisher
AMER METEOROLOGICAL SOC
Subject
SEA-SURFACE TEMPERATURE; OCEAN-ATMOSPHERE MODEL; WESTERLY WIND BURSTS; EL-NINO-LIKE; SOUTHERN-OSCILLATION; DECADAL VARIABILITY; EQUATORIAL PACIFIC; INTERANNUAL VARIABILITY; TROPICAL PACIFIC; PART II
Type
Article
Language
English
Document Type
Article
Publisher
AMER METEOROLOGICAL SOC
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