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    The Transient Atmospheric Circulation Response to North Atlantic SST and Sea Ice Anomalies

    Source: Journal of Climate:;2007:;volume( 020 ):;issue: 018::page 4751
    Author:
    Deser, Clara
    ,
    Tomas, Robert A.
    ,
    Peng, Shiling
    DOI: 10.1175/JCLI4278.1
    Publisher: American Meteorological Society
    Abstract: The objective of this study is to investigate the transient evolution of the wintertime atmospheric circulation response to imposed patterns of SST and sea ice extent anomalies in the North Atlantic sector using a large ensemble of experiments with the NCAR Community Climate Model version 3 (CCM3). The initial adjustment of the atmospheric circulation is characterized by an out-of-phase relationship between geopotential height anomalies in the lower and upper troposphere localized to the vicinity of the forcing. This initial baroclinic response reaches a maximum amplitude in ?5?10 days, and persists for 2?3 weeks. Diagnostic results with a linear primitive equation model indicate that this initial response is forced by diabatic heating anomalies in the lower troposphere associated with surface heat flux anomalies generated by the imposed thermal forcing. Following the initial baroclinic stage of adjustment, the response becomes progressively more barotropic and increases in both spatial extent and magnitude. The equilibrium stage of adjustment is reached in 2?2.5 months, and is characterized by an equivalent barotropic structure that resembles the hemispheric North Atlantic Oscillation?Northern Annular Mode (NAO?NAM) pattern, the model?s leading internal mode of circulation variability over the Northern Hemisphere. The maximum amplitude of the equilibrium response is approximately 2?3 times larger than that of the initial response. The equilibrium response is primarily maintained by nonlinear transient eddy fluxes of vorticity (and, to a lesser extent, heat), with diabatic heating making a limited contribution in the vicinity of the forcing.
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      The Transient Atmospheric Circulation Response to North Atlantic SST and Sea Ice Anomalies

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    contributor authorDeser, Clara
    contributor authorTomas, Robert A.
    contributor authorPeng, Shiling
    date accessioned2017-06-09T17:03:36Z
    date available2017-06-09T17:03:36Z
    date copyright2007/09/01
    date issued2007
    identifier issn0894-8755
    identifier otherams-78739.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4221441
    description abstractThe objective of this study is to investigate the transient evolution of the wintertime atmospheric circulation response to imposed patterns of SST and sea ice extent anomalies in the North Atlantic sector using a large ensemble of experiments with the NCAR Community Climate Model version 3 (CCM3). The initial adjustment of the atmospheric circulation is characterized by an out-of-phase relationship between geopotential height anomalies in the lower and upper troposphere localized to the vicinity of the forcing. This initial baroclinic response reaches a maximum amplitude in ?5?10 days, and persists for 2?3 weeks. Diagnostic results with a linear primitive equation model indicate that this initial response is forced by diabatic heating anomalies in the lower troposphere associated with surface heat flux anomalies generated by the imposed thermal forcing. Following the initial baroclinic stage of adjustment, the response becomes progressively more barotropic and increases in both spatial extent and magnitude. The equilibrium stage of adjustment is reached in 2?2.5 months, and is characterized by an equivalent barotropic structure that resembles the hemispheric North Atlantic Oscillation?Northern Annular Mode (NAO?NAM) pattern, the model?s leading internal mode of circulation variability over the Northern Hemisphere. The maximum amplitude of the equilibrium response is approximately 2?3 times larger than that of the initial response. The equilibrium response is primarily maintained by nonlinear transient eddy fluxes of vorticity (and, to a lesser extent, heat), with diabatic heating making a limited contribution in the vicinity of the forcing.
    publisherAmerican Meteorological Society
    titleThe Transient Atmospheric Circulation Response to North Atlantic SST and Sea Ice Anomalies
    typeJournal Paper
    journal volume20
    journal issue18
    journal titleJournal of Climate
    identifier doi10.1175/JCLI4278.1
    journal fristpage4751
    journal lastpage4767
    treeJournal of Climate:;2007:;volume( 020 ):;issue: 018
    contenttypeFulltext
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