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    Atmospheric Circulation Features Associated with Rainfall Variability over Southern Northeast Brazil

    Source: Monthly Weather Review:;2001:;volume( 129 ):;issue: 010::page 2614
    Author:
    Chaves, Rosane Rodrigues
    ,
    Cavalcanti, Iracema Fonseca Albuquerque
    DOI: 10.1175/1520-0493(2001)129<2614:ACFAWR>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The atmospheric circulation features associated with rainfall variability during the main rainy period of the region of southern Northeast Brazil (sNEB) are determined through principal components analysis and cluster analysis. Daily rainfall, NCEP reanalysis, and OLR data are used from 1979 to 1997. The analyses are performed considering a large area including South America and the Pacific and Atlantic Oceans and also considering a regional area over tropical South America. The influence of synoptic systems, as well as the phenomena associated with their variability, such as El Niño?Southern Oscillation (ENSO) and baroclinic waves over the Pacific Ocean and South America are discussed. Positive (negative) rainfall anomalies over sNEB are related to cold (warm) episodes in the tropical Pacific. On the intraseasonal timescale there are interrelationships among the South Atlantic convergence zone (SACZ), Bolivian high, and the northeast upper-cyclonic vortex. It is noted that rainy periods in sNEB are associated with a northward displacement of the SACZ, an upper-level cyclonic vortex situated over the Atlantic Ocean, intense convection over the eastern Amazon, and an eastward shift in the position of the Bolivian high. At low levels the flow is directed from the Amazon toward the sNEB and there is a shift of the South Atlantic subtropical anticyclone eastward with a weakening of the southeast trade winds over the northeast coast. The dry pattern is associated with a southward displacement of the SACZ, an upper-level cyclonic vortex either close to or over the continent, and a westward displacement of the Bolivian high. In this case, the low-level flow is directed from the Amazon to the south and there is a strengthening and/or westward shift of the South Atlantic anticyclone with an intensification of the southeast trade winds along the northeast coast.
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      Atmospheric Circulation Features Associated with Rainfall Variability over Southern Northeast Brazil

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4204855
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    • Monthly Weather Review

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    contributor authorChaves, Rosane Rodrigues
    contributor authorCavalcanti, Iracema Fonseca Albuquerque
    date accessioned2017-06-09T16:13:59Z
    date available2017-06-09T16:13:59Z
    date copyright2001/10/01
    date issued2001
    identifier issn0027-0644
    identifier otherams-63811.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4204855
    description abstractThe atmospheric circulation features associated with rainfall variability during the main rainy period of the region of southern Northeast Brazil (sNEB) are determined through principal components analysis and cluster analysis. Daily rainfall, NCEP reanalysis, and OLR data are used from 1979 to 1997. The analyses are performed considering a large area including South America and the Pacific and Atlantic Oceans and also considering a regional area over tropical South America. The influence of synoptic systems, as well as the phenomena associated with their variability, such as El Niño?Southern Oscillation (ENSO) and baroclinic waves over the Pacific Ocean and South America are discussed. Positive (negative) rainfall anomalies over sNEB are related to cold (warm) episodes in the tropical Pacific. On the intraseasonal timescale there are interrelationships among the South Atlantic convergence zone (SACZ), Bolivian high, and the northeast upper-cyclonic vortex. It is noted that rainy periods in sNEB are associated with a northward displacement of the SACZ, an upper-level cyclonic vortex situated over the Atlantic Ocean, intense convection over the eastern Amazon, and an eastward shift in the position of the Bolivian high. At low levels the flow is directed from the Amazon toward the sNEB and there is a shift of the South Atlantic subtropical anticyclone eastward with a weakening of the southeast trade winds over the northeast coast. The dry pattern is associated with a southward displacement of the SACZ, an upper-level cyclonic vortex either close to or over the continent, and a westward displacement of the Bolivian high. In this case, the low-level flow is directed from the Amazon to the south and there is a strengthening and/or westward shift of the South Atlantic anticyclone with an intensification of the southeast trade winds along the northeast coast.
    publisherAmerican Meteorological Society
    titleAtmospheric Circulation Features Associated with Rainfall Variability over Southern Northeast Brazil
    typeJournal Paper
    journal volume129
    journal issue10
    journal titleMonthly Weather Review
    identifier doi10.1175/1520-0493(2001)129<2614:ACFAWR>2.0.CO;2
    journal fristpage2614
    journal lastpage2626
    treeMonthly Weather Review:;2001:;volume( 129 ):;issue: 010
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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