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    El Niño and Atmospheric Water Vapor: Observations from Nimbus 7 SMMR

    Source: Journal of Climate and Applied Meteorology:;1985:;Volume( 024 ):;Issue: 012::page 1311
    Author:
    Prabhakara, C.
    ,
    Short, David A.
    ,
    Vollmer, Bruce E.
    DOI: 10.1175/1520-0450(1985)024<1311:ENAAWV>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Atmospheric water vapor over the global oceans is remotely sensed from the Nimbus 7 Scanning Multichannel Microwave Radiometer (SMMR) measurements for about five years?January 1979 to September 1983. Based on the data for three years, 1979?81, preceding the recent El Niño event, we have derived monthly and seasonal mean maps of the water vapor over the oceans. These seasonal mean maps show five prominent features in the water vapor distribution throughout the year with some seasonal changes. Four of these features are associated with the subtropical anticyclones in the Pacific and Atlantic Oceans in the Northern and Southern Hemispheres. The fifth feature is apparently associated with the Walker circulation in the tropical Pacific Ocean. This feature is a cell of maximum values in the water vapor stretched along the equator from about 60°E to the dateline. Interannual variability of the water vapor over the oceans occurs mostly on the peripheries of these atmospheric circulation features. Anomalies, with respect to the three year monthly mean, in the water vapor distribution over the oceans during the 1982?83 El Niño event lead us to infer significant changes in the circulation of the lower layers of the atmosphere at that time. The intense phase of the El Niño is accompanied by well-organized subsidence to the west, north, and south of the convectively active zone that is over the near-equatorial regions of the central Pacific. As the convective zone intensifies and moves eastward the associated subsidence intensifies and moves with it. These observations imply, in a simplistic sense, that the ?Walker circulation? that is normally present in the equatorial Pacific region appears to be reversed at the time of the intense phase of El Niño. It appears that the decay phase of El Niño is marked by decoupling of the subsidence zone from the convective zone.
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      El Niño and Atmospheric Water Vapor: Observations from Nimbus 7 SMMR

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4146102
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    • Journal of Climate and Applied Meteorology

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    contributor authorPrabhakara, C.
    contributor authorShort, David A.
    contributor authorVollmer, Bruce E.
    date accessioned2017-06-09T14:00:53Z
    date available2017-06-09T14:00:53Z
    date copyright1985/12/01
    date issued1985
    identifier issn0733-3021
    identifier otherams-10930.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4146102
    description abstractAtmospheric water vapor over the global oceans is remotely sensed from the Nimbus 7 Scanning Multichannel Microwave Radiometer (SMMR) measurements for about five years?January 1979 to September 1983. Based on the data for three years, 1979?81, preceding the recent El Niño event, we have derived monthly and seasonal mean maps of the water vapor over the oceans. These seasonal mean maps show five prominent features in the water vapor distribution throughout the year with some seasonal changes. Four of these features are associated with the subtropical anticyclones in the Pacific and Atlantic Oceans in the Northern and Southern Hemispheres. The fifth feature is apparently associated with the Walker circulation in the tropical Pacific Ocean. This feature is a cell of maximum values in the water vapor stretched along the equator from about 60°E to the dateline. Interannual variability of the water vapor over the oceans occurs mostly on the peripheries of these atmospheric circulation features. Anomalies, with respect to the three year monthly mean, in the water vapor distribution over the oceans during the 1982?83 El Niño event lead us to infer significant changes in the circulation of the lower layers of the atmosphere at that time. The intense phase of the El Niño is accompanied by well-organized subsidence to the west, north, and south of the convectively active zone that is over the near-equatorial regions of the central Pacific. As the convective zone intensifies and moves eastward the associated subsidence intensifies and moves with it. These observations imply, in a simplistic sense, that the ?Walker circulation? that is normally present in the equatorial Pacific region appears to be reversed at the time of the intense phase of El Niño. It appears that the decay phase of El Niño is marked by decoupling of the subsidence zone from the convective zone.
    publisherAmerican Meteorological Society
    titleEl Niño and Atmospheric Water Vapor: Observations from Nimbus 7 SMMR
    typeJournal Paper
    journal volume24
    journal issue12
    journal titleJournal of Climate and Applied Meteorology
    identifier doi10.1175/1520-0450(1985)024<1311:ENAAWV>2.0.CO;2
    journal fristpage1311
    journal lastpage1324
    treeJournal of Climate and Applied Meteorology:;1985:;Volume( 024 ):;Issue: 012
    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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