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    Trend in Northern Hemisphere Winter Atmospheric Circulation during the Last Half of the Twentieth Century

    Source: Journal of Climate:;2004:;volume( 017 ):;issue: 019::page 3745
    Author:
    Lu, Jian
    ,
    Greatbatch, Richard J.
    ,
    Peterson, K. Andrew
    DOI: 10.1175/1520-0442(2004)017<3745:TINHWA>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: During the last half century, the trend in the Northern Hemisphere tropospheric circulation has been associated with a deepening of both the Aleutian and Icelandic lows, a pattern akin to the ?Cold Ocean Warm Land? (COWL) pattern. A simplified dynamical model is used to show that the observed simultaneous deepening trend in both the Aleutian and Icelandic lows can be largely explained as a hemispheric planetary wave response to tropical diabatic forcing in the Indo?Pacific region. In the model, the extratropical storm tracks play a role in modulating the wave train, tending to enhance (weaken) the anomalous Icelandic (Aleutian) low in the North Atlantic (North Pacific) sector. The model results also suggest two ways in which the circulation trend over the North Atlantic sector could have been influenced by tropical forcing: one a direct, linear planetary wave response from the eastern tropical Pacific and the other an indirect response of the North Atlantic storm track to tropical forcing over the western Indo?Pacific region. The possible role of tropical SST warming and anthropogenic forcing is also discussed.
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      Trend in Northern Hemisphere Winter Atmospheric Circulation during the Last Half of the Twentieth Century

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4208700
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    contributor authorLu, Jian
    contributor authorGreatbatch, Richard J.
    contributor authorPeterson, K. Andrew
    date accessioned2017-06-09T16:24:19Z
    date available2017-06-09T16:24:19Z
    date copyright2004/10/01
    date issued2004
    identifier issn0894-8755
    identifier otherams-6727.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4208700
    description abstractDuring the last half century, the trend in the Northern Hemisphere tropospheric circulation has been associated with a deepening of both the Aleutian and Icelandic lows, a pattern akin to the ?Cold Ocean Warm Land? (COWL) pattern. A simplified dynamical model is used to show that the observed simultaneous deepening trend in both the Aleutian and Icelandic lows can be largely explained as a hemispheric planetary wave response to tropical diabatic forcing in the Indo?Pacific region. In the model, the extratropical storm tracks play a role in modulating the wave train, tending to enhance (weaken) the anomalous Icelandic (Aleutian) low in the North Atlantic (North Pacific) sector. The model results also suggest two ways in which the circulation trend over the North Atlantic sector could have been influenced by tropical forcing: one a direct, linear planetary wave response from the eastern tropical Pacific and the other an indirect response of the North Atlantic storm track to tropical forcing over the western Indo?Pacific region. The possible role of tropical SST warming and anthropogenic forcing is also discussed.
    publisherAmerican Meteorological Society
    titleTrend in Northern Hemisphere Winter Atmospheric Circulation during the Last Half of the Twentieth Century
    typeJournal Paper
    journal volume17
    journal issue19
    journal titleJournal of Climate
    identifier doi10.1175/1520-0442(2004)017<3745:TINHWA>2.0.CO;2
    journal fristpage3745
    journal lastpage3760
    treeJournal of Climate:;2004:;volume( 017 ):;issue: 019
    contenttypeFulltext
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