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    Tropical Indian Ocean Variability in the IPCC Twentieth-Century Climate Simulations

    Source: Journal of Climate:;2006:;volume( 019 ):;issue: 017::page 4397
    Author:
    Saji, N. H.
    ,
    Xie, S-P.
    ,
    Yamagata, T.
    DOI: 10.1175/JCLI3847.1
    Publisher: American Meteorological Society
    Abstract: The twentieth-century simulations using by 17 coupled ocean?atmosphere general circulation models (CGCMs) submitted to the Intergovernmental Panel on Climate Change?s Fourth Assessment Report (IPCC AR4) are evaluated for their skill in reproducing the observed modes of Indian Ocean (IO) climate variability. Most models successfully capture the IO?s delayed, basinwide warming response a few months after El Niño?Southern Oscillation (ENSO) peaks in the Pacific. ENSO?s oceanic teleconnection into the IO, by coastal waves through the Indonesian archipelago, is poorly simulated in these models, with significant shifts in the turning latitude of radiating Rossby waves. In observations, ENSO forces, by the atmospheric bridge mechanism, strong ocean Rossby waves that induce anomalies of SST, atmospheric convection, and tropical cyclones in a thermocline dome over the southwestern tropical IO. While the southwestern IO thermocline dome is simulated in nearly all of the models, this ocean Rossby wave response to ENSO is present only in a few of the models examined, suggesting difficulties in simulating ENSO?s teleconnection in surface wind. A majority of the models display an equatorial zonal mode of the Bjerknes feedback with spatial structures and seasonality similar to the Indian Ocean dipole (IOD) in observations. This success appears to be due to their skills in simulating the mean state of the equatorial IO. Corroborating the role of the Bjerknes feedback in the IOD, the thermocline depth, SST, precipitation, and zonal wind are mutually positively correlated in these models, as in observations. The IOD?ENSO correlation during boreal fall ranges from ?0.43 to 0.74 in the different models, suggesting that ENSO is one, but not the only, trigger for the IOD.
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      Tropical Indian Ocean Variability in the IPCC Twentieth-Century Climate Simulations

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4220969
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    contributor authorSaji, N. H.
    contributor authorXie, S-P.
    contributor authorYamagata, T.
    date accessioned2017-06-09T17:02:12Z
    date available2017-06-09T17:02:12Z
    date copyright2006/09/01
    date issued2006
    identifier issn0894-8755
    identifier otherams-78313.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4220969
    description abstractThe twentieth-century simulations using by 17 coupled ocean?atmosphere general circulation models (CGCMs) submitted to the Intergovernmental Panel on Climate Change?s Fourth Assessment Report (IPCC AR4) are evaluated for their skill in reproducing the observed modes of Indian Ocean (IO) climate variability. Most models successfully capture the IO?s delayed, basinwide warming response a few months after El Niño?Southern Oscillation (ENSO) peaks in the Pacific. ENSO?s oceanic teleconnection into the IO, by coastal waves through the Indonesian archipelago, is poorly simulated in these models, with significant shifts in the turning latitude of radiating Rossby waves. In observations, ENSO forces, by the atmospheric bridge mechanism, strong ocean Rossby waves that induce anomalies of SST, atmospheric convection, and tropical cyclones in a thermocline dome over the southwestern tropical IO. While the southwestern IO thermocline dome is simulated in nearly all of the models, this ocean Rossby wave response to ENSO is present only in a few of the models examined, suggesting difficulties in simulating ENSO?s teleconnection in surface wind. A majority of the models display an equatorial zonal mode of the Bjerknes feedback with spatial structures and seasonality similar to the Indian Ocean dipole (IOD) in observations. This success appears to be due to their skills in simulating the mean state of the equatorial IO. Corroborating the role of the Bjerknes feedback in the IOD, the thermocline depth, SST, precipitation, and zonal wind are mutually positively correlated in these models, as in observations. The IOD?ENSO correlation during boreal fall ranges from ?0.43 to 0.74 in the different models, suggesting that ENSO is one, but not the only, trigger for the IOD.
    publisherAmerican Meteorological Society
    titleTropical Indian Ocean Variability in the IPCC Twentieth-Century Climate Simulations
    typeJournal Paper
    journal volume19
    journal issue17
    journal titleJournal of Climate
    identifier doi10.1175/JCLI3847.1
    journal fristpage4397
    journal lastpage4417
    treeJournal of Climate:;2006:;volume( 019 ):;issue: 017
    contenttypeFulltext
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