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    Mechanisms of Locking of the El Niño and La Niña Mature Phases to Boreal Winter

    Source: Journal of Climate:;2001:;volume( 014 ):;issue: 009::page 2164
    Author:
    An, Soon-Il
    ,
    Wang, Bin
    DOI: 10.1175/1520-0442(2001)014<2164:MOLOTE>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The peaks of El Niño in the Cane?Zebiak (CZ) model tend to appear most frequently around November when the ocean Rossby waves, which were amplified during the previous unstable season (February?May), turn back to the eastern Pacific and when the local instability in the eastern Pacific is very weak. The peaks of La Niña in the CZ model occur most frequently in boreal summer, in contrast to the observed counterpart that usually occurs in boreal winter. Sensitivity experiments indicate that the phase locking of the La Niña to boreal summer is primarily caused by seasonal variations of the tropical convergence zone, which regulate convective heating through atmospheric convergence feedback. The observed thermocline and the wind anomalies in the western Pacific exhibit considerable seasonal variations. These were missed in the original CZ model. In a modified CZ model that includes the seasonal variations of the western Pacific wind anomalies and the basic-state thermocline depth, the peaks of La Niña preferably occur in boreal winter, suggesting that the seasonal variation of the western Pacific surface wind anomalies and the mean thermocline depth are critical factors for the phase locking of the mature La Niña to boreal winter. The mechanisms by which these factors affect ENSO phase locking are also discussed.
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      Mechanisms of Locking of the El Niño and La Niña Mature Phases to Boreal Winter

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4198200
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    contributor authorAn, Soon-Il
    contributor authorWang, Bin
    date accessioned2017-06-09T15:58:18Z
    date available2017-06-09T15:58:18Z
    date copyright2001/05/01
    date issued2001
    identifier issn0894-8755
    identifier otherams-5782.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4198200
    description abstractThe peaks of El Niño in the Cane?Zebiak (CZ) model tend to appear most frequently around November when the ocean Rossby waves, which were amplified during the previous unstable season (February?May), turn back to the eastern Pacific and when the local instability in the eastern Pacific is very weak. The peaks of La Niña in the CZ model occur most frequently in boreal summer, in contrast to the observed counterpart that usually occurs in boreal winter. Sensitivity experiments indicate that the phase locking of the La Niña to boreal summer is primarily caused by seasonal variations of the tropical convergence zone, which regulate convective heating through atmospheric convergence feedback. The observed thermocline and the wind anomalies in the western Pacific exhibit considerable seasonal variations. These were missed in the original CZ model. In a modified CZ model that includes the seasonal variations of the western Pacific wind anomalies and the basic-state thermocline depth, the peaks of La Niña preferably occur in boreal winter, suggesting that the seasonal variation of the western Pacific surface wind anomalies and the mean thermocline depth are critical factors for the phase locking of the mature La Niña to boreal winter. The mechanisms by which these factors affect ENSO phase locking are also discussed.
    publisherAmerican Meteorological Society
    titleMechanisms of Locking of the El Niño and La Niña Mature Phases to Boreal Winter
    typeJournal Paper
    journal volume14
    journal issue9
    journal titleJournal of Climate
    identifier doi10.1175/1520-0442(2001)014<2164:MOLOTE>2.0.CO;2
    journal fristpage2164
    journal lastpage2176
    treeJournal of Climate:;2001:;volume( 014 ):;issue: 009
    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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