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    Impact of Tropical SST on Stratospheric Planetary Waves in the Southern Hemisphere

    Source: Journal of Climate:;2012:;volume( 025 ):;issue: 014::page 5030
    Author:
    Lin, Pu
    ,
    Fu, Qiang
    ,
    Hartmann, Dennis L.
    DOI: 10.1175/JCLI-D-11-00378.1
    Publisher: American Meteorological Society
    Abstract: he impact of tropical sea surface temperature (SST) on stratospheric planetary waves in the Southern Hemisphere (SH) is investigated in austral spring using observed SST and reanalysis data for the past three decades. Maximum covariance analysis indicates that the tropical SST and the SH stratospheric planetary wave activity are primarily coupled through two modes. The leading two modes show the La Niña?like and the central-Pacific El Niño?like SST anomalies in their positive polarities, respectively, which each are related to enhanced stratospheric planetary wave activity. These two modes also introduce phase shifts to the stratospheric stationary planetary waves: a westward shift is seen for La Niña and an eastward shift for warm SST anomalies is seen in the central Pacific. The Eliassen?Palm fluxes associated with the two modes indicate that the anomalous stratospheric wave activity originates in the troposphere and propagates upward over the mid?high latitudes, so that the linkages between tropical SST and extratropical tropospheric circulation appear to play a key role. Furthermore, the observed circulation anomaly patterns for the two modes change rapidly from spring to summer, consistent with a sharp seasonal transition in the SH basic state. Similar SST and circulation anomaly patterns associated with the two modes are simulated in chemistry?climate models.
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      Impact of Tropical SST on Stratospheric Planetary Waves in the Southern Hemisphere

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    contributor authorLin, Pu
    contributor authorFu, Qiang
    contributor authorHartmann, Dennis L.
    date accessioned2017-06-09T17:04:52Z
    date available2017-06-09T17:04:52Z
    date copyright2012/07/01
    date issued2012
    identifier issn0894-8755
    identifier otherams-79078.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4221818
    description abstracthe impact of tropical sea surface temperature (SST) on stratospheric planetary waves in the Southern Hemisphere (SH) is investigated in austral spring using observed SST and reanalysis data for the past three decades. Maximum covariance analysis indicates that the tropical SST and the SH stratospheric planetary wave activity are primarily coupled through two modes. The leading two modes show the La Niña?like and the central-Pacific El Niño?like SST anomalies in their positive polarities, respectively, which each are related to enhanced stratospheric planetary wave activity. These two modes also introduce phase shifts to the stratospheric stationary planetary waves: a westward shift is seen for La Niña and an eastward shift for warm SST anomalies is seen in the central Pacific. The Eliassen?Palm fluxes associated with the two modes indicate that the anomalous stratospheric wave activity originates in the troposphere and propagates upward over the mid?high latitudes, so that the linkages between tropical SST and extratropical tropospheric circulation appear to play a key role. Furthermore, the observed circulation anomaly patterns for the two modes change rapidly from spring to summer, consistent with a sharp seasonal transition in the SH basic state. Similar SST and circulation anomaly patterns associated with the two modes are simulated in chemistry?climate models.
    publisherAmerican Meteorological Society
    titleImpact of Tropical SST on Stratospheric Planetary Waves in the Southern Hemisphere
    typeJournal Paper
    journal volume25
    journal issue14
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-11-00378.1
    journal fristpage5030
    journal lastpage5046
    treeJournal of Climate:;2012:;volume( 025 ):;issue: 014
    contenttypeFulltext
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