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    ENSO Impact on Kelvin Waves and Associated Tropical Convection

    Source: Journal of the Atmospheric Sciences:;2013:;Volume( 070 ):;issue: 011::page 3513
    Author:
    Yang, Gui-Ying
    ,
    Hoskins, Brian
    DOI: 10.1175/JAS-D-13-081.1
    Publisher: American Meteorological Society
    Abstract: he impact of El Niño?Southern Oscillation (ENSO) on atmospheric Kelvin waves and associated tropical convection is investigated using the ECMWF Re-Analysis, NOAA outgoing longwave radiation (OLR), and the analysis technique introduced in a previous study. It is found that the phase of ENSO has a substantial impact on Kelvin waves and associated convection over the equatorial central-eastern Pacific. El Niño (La Niña) events enhance (suppress) variability of the upper-tropospheric Kelvin wave and the associated convection there, in both extended boreal winter and summer.The mechanism of the impact is through changes in the ENSO-related thermal conditions and the ambient flow. In El Niño years, because of SST increase in the equatorial central-eastern Pacific, variability of eastward-moving convection, which is mainly associated with Kelvin waves, intensifies in the region. In addition, owing to the weakening of the equatorial eastern Pacific westerly duct in the upper troposphere in El Niño years, Kelvin waves amplify there. In La Niña years, the opposite occurs. However, the stronger westerly duct in La Niña winters allows more NH extratropical Rossby wave activity to propagate equatorward and force Kelvin waves around 200 hPa, partially offsetting the in situ weakening effect of the stronger westerlies on the waves. In general, in El Niño years Kelvin waves are more convectively and vertically coupled and propagate more upward into the lower stratosphere over the central-eastern Pacific.The ENSO impact in other regions is not clear, although in winter over the eastern Indian and western Pacific Oceans Kelvin waves and their associated convection are slightly weaker in El Niño than in La Niña years.
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      ENSO Impact on Kelvin Waves and Associated Tropical Convection

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4219503
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    • Journal of the Atmospheric Sciences

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    contributor authorYang, Gui-Ying
    contributor authorHoskins, Brian
    date accessioned2017-06-09T16:57:16Z
    date available2017-06-09T16:57:16Z
    date copyright2013/11/01
    date issued2013
    identifier issn0022-4928
    identifier otherams-76995.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4219503
    description abstracthe impact of El Niño?Southern Oscillation (ENSO) on atmospheric Kelvin waves and associated tropical convection is investigated using the ECMWF Re-Analysis, NOAA outgoing longwave radiation (OLR), and the analysis technique introduced in a previous study. It is found that the phase of ENSO has a substantial impact on Kelvin waves and associated convection over the equatorial central-eastern Pacific. El Niño (La Niña) events enhance (suppress) variability of the upper-tropospheric Kelvin wave and the associated convection there, in both extended boreal winter and summer.The mechanism of the impact is through changes in the ENSO-related thermal conditions and the ambient flow. In El Niño years, because of SST increase in the equatorial central-eastern Pacific, variability of eastward-moving convection, which is mainly associated with Kelvin waves, intensifies in the region. In addition, owing to the weakening of the equatorial eastern Pacific westerly duct in the upper troposphere in El Niño years, Kelvin waves amplify there. In La Niña years, the opposite occurs. However, the stronger westerly duct in La Niña winters allows more NH extratropical Rossby wave activity to propagate equatorward and force Kelvin waves around 200 hPa, partially offsetting the in situ weakening effect of the stronger westerlies on the waves. In general, in El Niño years Kelvin waves are more convectively and vertically coupled and propagate more upward into the lower stratosphere over the central-eastern Pacific.The ENSO impact in other regions is not clear, although in winter over the eastern Indian and western Pacific Oceans Kelvin waves and their associated convection are slightly weaker in El Niño than in La Niña years.
    publisherAmerican Meteorological Society
    titleENSO Impact on Kelvin Waves and Associated Tropical Convection
    typeJournal Paper
    journal volume70
    journal issue11
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-13-081.1
    journal fristpage3513
    journal lastpage3532
    treeJournal of the Atmospheric Sciences:;2013:;Volume( 070 ):;issue: 011
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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