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    Low-Level African Easterly Wave Activity and Its Relation to Atlantic Tropical Cyclogenesis in 2001

    Source: Monthly Weather Review:;2007:;volume( 135 ):;issue: 012::page 3950
    Author:
    Ross, Robert S.
    ,
    Krishnamurti, T. N.
    DOI: 10.1175/2007MWR1996.1
    Publisher: American Meteorological Society
    Abstract: This paper provides new information on the low-level (850 hPa) structure and behavior of African easterly waves (AEWs) and relates this information to previous studies. Individual AEWs that occurred during June?September of 2001 are studied by a synoptic approach that employs Hovmöller diagrams, wave track maps, and case studies. The focus is on two AEW regimes in the lower troposphere over North Africa: a dry regime to the north of the African easterly jet (AEJ) coincident with the surface position of the monsoon trough near 20°N, and a wet regime to the south of the jet coincident with the near-equatorial rainbelt near 10°N. The following issues are addressed: the origin of the waves seen in the two wave regimes, relation of the wave activity to the mean positions of the surface monsoon trough and the 600?700-hPa AEJ, collocation of the tracks of the two wave regimes off the African coast, and diversity in low-level wave behavior that includes merging, splitting, and dissipation of the cyclonic vorticity centers associated with the wave troughs. The relationship between the waves following the two tracks is examined as well as the relationship between the low-level wave activity and Atlantic tropical cyclogenesis in 2001. It is shown that the two wave regimes can interact, and that both regimes were instrumental in Atlantic tropical cyclogenesis in 2001.
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      Low-Level African Easterly Wave Activity and Its Relation to Atlantic Tropical Cyclogenesis in 2001

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4207531
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    contributor authorRoss, Robert S.
    contributor authorKrishnamurti, T. N.
    date accessioned2017-06-09T16:20:54Z
    date available2017-06-09T16:20:54Z
    date copyright2007/12/01
    date issued2007
    identifier issn0027-0644
    identifier otherams-66219.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4207531
    description abstractThis paper provides new information on the low-level (850 hPa) structure and behavior of African easterly waves (AEWs) and relates this information to previous studies. Individual AEWs that occurred during June?September of 2001 are studied by a synoptic approach that employs Hovmöller diagrams, wave track maps, and case studies. The focus is on two AEW regimes in the lower troposphere over North Africa: a dry regime to the north of the African easterly jet (AEJ) coincident with the surface position of the monsoon trough near 20°N, and a wet regime to the south of the jet coincident with the near-equatorial rainbelt near 10°N. The following issues are addressed: the origin of the waves seen in the two wave regimes, relation of the wave activity to the mean positions of the surface monsoon trough and the 600?700-hPa AEJ, collocation of the tracks of the two wave regimes off the African coast, and diversity in low-level wave behavior that includes merging, splitting, and dissipation of the cyclonic vorticity centers associated with the wave troughs. The relationship between the waves following the two tracks is examined as well as the relationship between the low-level wave activity and Atlantic tropical cyclogenesis in 2001. It is shown that the two wave regimes can interact, and that both regimes were instrumental in Atlantic tropical cyclogenesis in 2001.
    publisherAmerican Meteorological Society
    titleLow-Level African Easterly Wave Activity and Its Relation to Atlantic Tropical Cyclogenesis in 2001
    typeJournal Paper
    journal volume135
    journal issue12
    journal titleMonthly Weather Review
    identifier doi10.1175/2007MWR1996.1
    journal fristpage3950
    journal lastpage3964
    treeMonthly Weather Review:;2007:;volume( 135 ):;issue: 012
    contenttypeFulltext
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