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    Dynamics of the West African Monsoon. Part IV: Analysis of 25–90-Day Variability of Convection and the Role of the Indian Monsoon

    Source: Journal of Climate:;2009:;volume( 022 ):;issue: 006::page 1541
    Author:
    Janicot, Serge
    ,
    Mounier, Flore
    ,
    Hall, Nicholas M. J.
    ,
    Leroux, Stéphanie
    ,
    Sultan, Benjamin
    ,
    Kiladis, George N.
    DOI: 10.1175/2008JCLI2314.1
    Publisher: American Meteorological Society
    Abstract: This paper is part of a series of studies addressing the dynamics of the West African summer monsoon at intraseasonal time scales between 10 and 90 days. The dominant mode of 25?90-day convective variability in the African monsoon was investigated, starting from previous results involving the excitation of dry equatorial Kelvin and Rossby waves by a negative diabatic heat source located over the warm pool. This evolution is consistent with a significant contribution by a convectively coupled equatorial Rossby wave and the MJO. On the other hand, convectively coupled Kelvin waves as well as the dry Kelvin wave signal have a very weak impact. However, there is more to the global control of the African summer monsoon than convectively coupled wave dynamics. The active/break cycle of the Indian monsoon, controlled by a northward-moving dipole of diabatic heating in the Indian sector, can also influence the African monsoon through atmospheric teleconnections. Simulations performed with a dry primitive equation model show that this influence may be transferred through the northern Indian heat source, which excites a Rossby cyclonic circulation propagating westward over North Africa that is cut off by the northward arrival of the equatorial Indian heat source and the associated intrusion of an anticyclonic ridge. Low-level westerly winds and moisture advection within the ITCZ consequently increase over Africa. The mean time lag between an active phase over India and over Africa is about 15?20 days.
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      Dynamics of the West African Monsoon. Part IV: Analysis of 25–90-Day Variability of Convection and the Role of the Indian Monsoon

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4208549
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    contributor authorJanicot, Serge
    contributor authorMounier, Flore
    contributor authorHall, Nicholas M. J.
    contributor authorLeroux, Stéphanie
    contributor authorSultan, Benjamin
    contributor authorKiladis, George N.
    date accessioned2017-06-09T16:23:53Z
    date available2017-06-09T16:23:53Z
    date copyright2009/03/01
    date issued2009
    identifier issn0894-8755
    identifier otherams-67135.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4208549
    description abstractThis paper is part of a series of studies addressing the dynamics of the West African summer monsoon at intraseasonal time scales between 10 and 90 days. The dominant mode of 25?90-day convective variability in the African monsoon was investigated, starting from previous results involving the excitation of dry equatorial Kelvin and Rossby waves by a negative diabatic heat source located over the warm pool. This evolution is consistent with a significant contribution by a convectively coupled equatorial Rossby wave and the MJO. On the other hand, convectively coupled Kelvin waves as well as the dry Kelvin wave signal have a very weak impact. However, there is more to the global control of the African summer monsoon than convectively coupled wave dynamics. The active/break cycle of the Indian monsoon, controlled by a northward-moving dipole of diabatic heating in the Indian sector, can also influence the African monsoon through atmospheric teleconnections. Simulations performed with a dry primitive equation model show that this influence may be transferred through the northern Indian heat source, which excites a Rossby cyclonic circulation propagating westward over North Africa that is cut off by the northward arrival of the equatorial Indian heat source and the associated intrusion of an anticyclonic ridge. Low-level westerly winds and moisture advection within the ITCZ consequently increase over Africa. The mean time lag between an active phase over India and over Africa is about 15?20 days.
    publisherAmerican Meteorological Society
    titleDynamics of the West African Monsoon. Part IV: Analysis of 25–90-Day Variability of Convection and the Role of the Indian Monsoon
    typeJournal Paper
    journal volume22
    journal issue6
    journal titleJournal of Climate
    identifier doi10.1175/2008JCLI2314.1
    journal fristpage1541
    journal lastpage1565
    treeJournal of Climate:;2009:;volume( 022 ):;issue: 006
    contenttypeFulltext
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