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    Atmospheric Energetics over the Tropical Pacific during the ENSO Cycle

    Source: Journal of Climate:;2017:;volume( 030 ):;issue: 010::page 3635
    Author:
    Dong, Di;Li, Jianping;Huyan, Lidou;Xue, Jiaqing
    DOI: 10.1175/JCLI-D-16-0480.1
    Publisher: American Meteorological Society
    Abstract: AbstractThe atmospheric perturbation potential energy (PPE) over the tropical Pacific is calculated and analyzed in a composite ENSO cycle. The PPE over the tropical Pacific troposphere increases during El Niño and decreases during La Niña, displaying two centers symmetrical about the equator and delaying the central?eastern Pacific SST anomaly by two months. Generated from atmospheric diabatic heating, the smaller part of PPE in the lower troposphere varies synchronously with the central?eastern Pacific SST through sensible heating, while the larger part of PPE lies in the mid- and upper troposphere and lags the central?eastern Pacific SST about one season because of latent heat release. As the tropical Pacific PPE peaks during the boreal late winter in an El Niño event, two anticyclones form in the upper troposphere as a result of the Gill model response. More PPE is converted to atmospheric kinetic energy (KE) above the central?western Pacific, but less over the eastern Pacific, leading to intensified Hadley circulations over the central?western Pacific and weakened Hadley circulations over the eastern Pacific. The strengthened Hadley circulations cause surface easterly wind bursts through KE convergence in the western equatorial Pacific, which may trigger a La Niña event. The reverse situation occurs during La Niña. Thus, the response of the Hadley circulations in the central?western Pacific provides a negative feedback during the ENSO cycle.
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      Atmospheric Energetics over the Tropical Pacific during the ENSO Cycle

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    contributor authorDong, Di;Li, Jianping;Huyan, Lidou;Xue, Jiaqing
    date accessioned2018-01-03T11:00:44Z
    date available2018-01-03T11:00:44Z
    date copyright2/8/2017 12:00:00 AM
    date issued2017
    identifier otherjcli-d-16-0480.1.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4246010
    description abstractAbstractThe atmospheric perturbation potential energy (PPE) over the tropical Pacific is calculated and analyzed in a composite ENSO cycle. The PPE over the tropical Pacific troposphere increases during El Niño and decreases during La Niña, displaying two centers symmetrical about the equator and delaying the central?eastern Pacific SST anomaly by two months. Generated from atmospheric diabatic heating, the smaller part of PPE in the lower troposphere varies synchronously with the central?eastern Pacific SST through sensible heating, while the larger part of PPE lies in the mid- and upper troposphere and lags the central?eastern Pacific SST about one season because of latent heat release. As the tropical Pacific PPE peaks during the boreal late winter in an El Niño event, two anticyclones form in the upper troposphere as a result of the Gill model response. More PPE is converted to atmospheric kinetic energy (KE) above the central?western Pacific, but less over the eastern Pacific, leading to intensified Hadley circulations over the central?western Pacific and weakened Hadley circulations over the eastern Pacific. The strengthened Hadley circulations cause surface easterly wind bursts through KE convergence in the western equatorial Pacific, which may trigger a La Niña event. The reverse situation occurs during La Niña. Thus, the response of the Hadley circulations in the central?western Pacific provides a negative feedback during the ENSO cycle.
    publisherAmerican Meteorological Society
    titleAtmospheric Energetics over the Tropical Pacific during the ENSO Cycle
    typeJournal Paper
    journal volume30
    journal issue10
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-16-0480.1
    journal fristpage3635
    journal lastpage3654
    treeJournal of Climate:;2017:;volume( 030 ):;issue: 010
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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