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    Seasonal Variation, Abrupt Transition, and Intraseasonal Variability Associated with the Asian Summer Monsoon in the GLA GCM

    Source: Journal of Climate:;1996:;volume( 009 ):;issue: 005::page 965
    Author:
    Lau, K-M.
    ,
    Yang, Song
    DOI: 10.1175/1520-0442(1996)009<0965:SVATAI>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: In this paper, a description of the global and regional features of the Asian summer monsoon in the Goddard Laboratory Atmospheres (GLA) general circulation model (GCM) is presented based on a 10-yr (1979?1988) integration of the model under the Atmospheric Model Intercomparison Project. It is found that the earliest signal of onset of the Asian monsoon is represented by the emergence of convection over the Indo-China ?land bridge? in early May, followed by the sudden jump of the equatorial ITCZ (intertropical convergence zone) to 10°N over the South China Sea and Indian Ocean in mid-May. This sudden jump is linked to an abrupt northward shift of the ascending branch of the local Hadley circulation, possibly stemming from symmetric instability of the basic flow in May. In agreement with observations, the model shows a pronounced intraseasonal oscillation along the equator and enhanced synoptic-scale activities identified as easterly waves in the tropical and subtropical western Pacific. These intraseasonal and synoptic activities strongly regulate rainfall variability over East Asia, especially during the premonsoon period. While the model simulates a similar range of variability in the broad-scale structure and evolution of the Asian monsoon as observed, there is considerable scope for improvement in the model's ability to simulate regional features of the monsoon. Compared to observed climatology, the model produces deficient rainfall over northern India but excessive rainfall over the South China Sea and the western Pacific region due to an overactive ITCZ at 10°N. The intraseasonal transition between the equatorial ITCZ and the monsoon (land) convection to the north is weaker than in nature. Moreover, the East Asian monsoon trough and Mei-yu rainband are under-developed in the model. These discrepancies are related to the limited northward extension of the model monsoon circulation and the confinement of the upper-level easterly flow near the equator. Overall, the GLA GCM provides a reasonably realistic description of the seasonal and subseasonal climatology of the Asian monsoon and yields important information that sheds new light on the dynamical underpinnings of the multiscale variabilities associated with the Asian summer monsoon.
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      Seasonal Variation, Abrupt Transition, and Intraseasonal Variability Associated with the Asian Summer Monsoon in the GLA GCM

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4184367
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    contributor authorLau, K-M.
    contributor authorYang, Song
    date accessioned2017-06-09T15:29:56Z
    date available2017-06-09T15:29:56Z
    date copyright1996/05/01
    date issued1996
    identifier issn0894-8755
    identifier otherams-4537.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4184367
    description abstractIn this paper, a description of the global and regional features of the Asian summer monsoon in the Goddard Laboratory Atmospheres (GLA) general circulation model (GCM) is presented based on a 10-yr (1979?1988) integration of the model under the Atmospheric Model Intercomparison Project. It is found that the earliest signal of onset of the Asian monsoon is represented by the emergence of convection over the Indo-China ?land bridge? in early May, followed by the sudden jump of the equatorial ITCZ (intertropical convergence zone) to 10°N over the South China Sea and Indian Ocean in mid-May. This sudden jump is linked to an abrupt northward shift of the ascending branch of the local Hadley circulation, possibly stemming from symmetric instability of the basic flow in May. In agreement with observations, the model shows a pronounced intraseasonal oscillation along the equator and enhanced synoptic-scale activities identified as easterly waves in the tropical and subtropical western Pacific. These intraseasonal and synoptic activities strongly regulate rainfall variability over East Asia, especially during the premonsoon period. While the model simulates a similar range of variability in the broad-scale structure and evolution of the Asian monsoon as observed, there is considerable scope for improvement in the model's ability to simulate regional features of the monsoon. Compared to observed climatology, the model produces deficient rainfall over northern India but excessive rainfall over the South China Sea and the western Pacific region due to an overactive ITCZ at 10°N. The intraseasonal transition between the equatorial ITCZ and the monsoon (land) convection to the north is weaker than in nature. Moreover, the East Asian monsoon trough and Mei-yu rainband are under-developed in the model. These discrepancies are related to the limited northward extension of the model monsoon circulation and the confinement of the upper-level easterly flow near the equator. Overall, the GLA GCM provides a reasonably realistic description of the seasonal and subseasonal climatology of the Asian monsoon and yields important information that sheds new light on the dynamical underpinnings of the multiscale variabilities associated with the Asian summer monsoon.
    publisherAmerican Meteorological Society
    titleSeasonal Variation, Abrupt Transition, and Intraseasonal Variability Associated with the Asian Summer Monsoon in the GLA GCM
    typeJournal Paper
    journal volume9
    journal issue5
    journal titleJournal of Climate
    identifier doi10.1175/1520-0442(1996)009<0965:SVATAI>2.0.CO;2
    journal fristpage965
    journal lastpage985
    treeJournal of Climate:;1996:;volume( 009 ):;issue: 005
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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