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    Interannual Variations of the Intraseasonal Oscillation in the South Asian Summer Monsoon Region

    Source: Journal of Climate:;2001:;volume( 014 ):;issue: 013::page 2910
    Author:
    Lawrence, David M.
    ,
    Webster, Peter J.
    DOI: 10.1175/1520-0442(2001)014<2910:IVOTIO>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: It is noted that the behavior of the intraseasonal oscillation (ISO) of the south Asian monsoon varies from year to year. An index representing seasonally averaged ISO activity is developed using outgoing longwave radiation data for the period 1975?97. Interannual variations in ISO activity are found to be related to year-to-year changes in the number of discrete events rather than to changes in the characteristic period. Summertime ISO activity exhibits a reasonably strong inverse relationship with Indian monsoon strength but not with total south Asian monsoon strength primarily because of a lack of correlation between ISO activity and the Bay of Bengal component of the south Asian monsoon. Over the 22-yr period examined here, the relationship between Indian monsoon strength and ISO activity is comparable to or even stronger than the well-documented relationship with El Niño?Southern Oscillation (ENSO). However, summertime ISO activity is found to be relatively uncorrelated with ENSO except for a weakly positive correlation at the beginning of the south Asian monsoon season. Therefore, the ISO activity?Indian monsoon relationship is essentially independent of the ENSO?Indian monsoon relationship. ISO activity is uncorrelated with any other contemporaneous or leading sea surface temperature variability.
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      Interannual Variations of the Intraseasonal Oscillation in the South Asian Summer Monsoon Region

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4198756
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    contributor authorLawrence, David M.
    contributor authorWebster, Peter J.
    date accessioned2017-06-09T15:59:40Z
    date available2017-06-09T15:59:40Z
    date copyright2001/07/01
    date issued2001
    identifier issn0894-8755
    identifier otherams-5832.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4198756
    description abstractIt is noted that the behavior of the intraseasonal oscillation (ISO) of the south Asian monsoon varies from year to year. An index representing seasonally averaged ISO activity is developed using outgoing longwave radiation data for the period 1975?97. Interannual variations in ISO activity are found to be related to year-to-year changes in the number of discrete events rather than to changes in the characteristic period. Summertime ISO activity exhibits a reasonably strong inverse relationship with Indian monsoon strength but not with total south Asian monsoon strength primarily because of a lack of correlation between ISO activity and the Bay of Bengal component of the south Asian monsoon. Over the 22-yr period examined here, the relationship between Indian monsoon strength and ISO activity is comparable to or even stronger than the well-documented relationship with El Niño?Southern Oscillation (ENSO). However, summertime ISO activity is found to be relatively uncorrelated with ENSO except for a weakly positive correlation at the beginning of the south Asian monsoon season. Therefore, the ISO activity?Indian monsoon relationship is essentially independent of the ENSO?Indian monsoon relationship. ISO activity is uncorrelated with any other contemporaneous or leading sea surface temperature variability.
    publisherAmerican Meteorological Society
    titleInterannual Variations of the Intraseasonal Oscillation in the South Asian Summer Monsoon Region
    typeJournal Paper
    journal volume14
    journal issue13
    journal titleJournal of Climate
    identifier doi10.1175/1520-0442(2001)014<2910:IVOTIO>2.0.CO;2
    journal fristpage2910
    journal lastpage2922
    treeJournal of Climate:;2001:;volume( 014 ):;issue: 013
    contenttypeFulltext
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