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    ENSO Amplitude Changes due to Climate Change Projections in Different Coupled Models

    Source: Journal of Climate:;2007:;volume( 020 ):;issue: 002::page 203
    Author:
    Yeh, Sang-Wook
    ,
    Kirtman, Ben P.
    DOI: 10.1175/JCLI4001.1
    Publisher: American Meteorological Society
    Abstract: Four climate system models are chosen here for an analysis of ENSO amplitude changes in 4 ? 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 ? 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.
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      ENSO Amplitude Changes due to Climate Change Projections in Different Coupled Models

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4221136
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    contributor authorYeh, Sang-Wook
    contributor authorKirtman, Ben P.
    date accessioned2017-06-09T17:02:42Z
    date available2017-06-09T17:02:42Z
    date copyright2007/01/01
    date issued2007
    identifier issn0894-8755
    identifier otherams-78464.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4221136
    description abstractFour climate system models are chosen here for an analysis of ENSO amplitude changes in 4 ? 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 ? 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.
    publisherAmerican Meteorological Society
    titleENSO Amplitude Changes due to Climate Change Projections in Different Coupled Models
    typeJournal Paper
    journal volume20
    journal issue2
    journal titleJournal of Climate
    identifier doi10.1175/JCLI4001.1
    journal fristpage203
    journal lastpage217
    treeJournal of Climate:;2007:;volume( 020 ):;issue: 002
    contenttypeFulltext
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