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    Analysis of the Characteristics and Mechanisms of the Pacific Decadal Oscillation in a Suite of Coupled Models from the Geophysical Fluid Dynamics Laboratory

    Source: Journal of Climate:;2015:;volume( 028 ):;issue: 019::page 7678
    Author:
    Zhang, Liping
    ,
    Delworth, Thomas L.
    DOI: 10.1175/JCLI-D-14-00647.1
    Publisher: American Meteorological Society
    Abstract: orth Pacific decadal oceanic and atmospheric variability is examined in a suite of coupled climate models developed at the Geophysical Fluid Dynamics Laboratory (GFDL). The models have ocean horizontal resolutions ranging from 1° to 0.1° and atmospheric horizontal resolutions ranging from 200 to 50 km. In all simulations the dominant pattern of decadal-scale sea surface temperature (SST) variability over the North Pacific is similar to the observed Pacific decadal oscillation (PDO). Simulated SST anomalies in the Kuroshio?Oyashio Extension (KOE) region exhibit a significant spectral peak at approximately 20 yr.Sensitivity experiments are used to show that (i) the simulated PDO mechanism involves extratropical air?sea interaction and oceanic Rossby wave propagation; (ii) the oscillation can exist independent of interactions with the tropics, but such interactions can enhance the PDO; and (iii) ocean?atmosphere feedback in the extratropics is critical for establishing the approximately 20-yr time scale of the PDO. The spatial pattern of the PDO can be generated from atmospheric variability that occurs independently of ocean?atmosphere feedback, but the existence of a spectral peak depends on active air?sea coupling. The specific interdecadal time scale is strongly influenced by the propagation speed of oceanic Rossby waves in the subtropical and subpolar gyres, as they provide a delayed feedback to the atmosphere. The simulated PDO has a realistic association with precipitation variations over North America, with a warm phase of the PDO generally associated with positive precipitation anomalies over regions of the western United States. The seasonal dependence of this relationship is also reproduced by the model.
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      Analysis of the Characteristics and Mechanisms of the Pacific Decadal Oscillation in a Suite of Coupled Models from the Geophysical Fluid Dynamics Laboratory

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4223751
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    contributor authorZhang, Liping
    contributor authorDelworth, Thomas L.
    date accessioned2017-06-09T17:11:23Z
    date available2017-06-09T17:11:23Z
    date copyright2015/10/01
    date issued2015
    identifier issn0894-8755
    identifier otherams-80817.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4223751
    description abstractorth Pacific decadal oceanic and atmospheric variability is examined in a suite of coupled climate models developed at the Geophysical Fluid Dynamics Laboratory (GFDL). The models have ocean horizontal resolutions ranging from 1° to 0.1° and atmospheric horizontal resolutions ranging from 200 to 50 km. In all simulations the dominant pattern of decadal-scale sea surface temperature (SST) variability over the North Pacific is similar to the observed Pacific decadal oscillation (PDO). Simulated SST anomalies in the Kuroshio?Oyashio Extension (KOE) region exhibit a significant spectral peak at approximately 20 yr.Sensitivity experiments are used to show that (i) the simulated PDO mechanism involves extratropical air?sea interaction and oceanic Rossby wave propagation; (ii) the oscillation can exist independent of interactions with the tropics, but such interactions can enhance the PDO; and (iii) ocean?atmosphere feedback in the extratropics is critical for establishing the approximately 20-yr time scale of the PDO. The spatial pattern of the PDO can be generated from atmospheric variability that occurs independently of ocean?atmosphere feedback, but the existence of a spectral peak depends on active air?sea coupling. The specific interdecadal time scale is strongly influenced by the propagation speed of oceanic Rossby waves in the subtropical and subpolar gyres, as they provide a delayed feedback to the atmosphere. The simulated PDO has a realistic association with precipitation variations over North America, with a warm phase of the PDO generally associated with positive precipitation anomalies over regions of the western United States. The seasonal dependence of this relationship is also reproduced by the model.
    publisherAmerican Meteorological Society
    titleAnalysis of the Characteristics and Mechanisms of the Pacific Decadal Oscillation in a Suite of Coupled Models from the Geophysical Fluid Dynamics Laboratory
    typeJournal Paper
    journal volume28
    journal issue19
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-14-00647.1
    journal fristpage7678
    journal lastpage7701
    treeJournal of Climate:;2015:;volume( 028 ):;issue: 019
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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