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    Tropical and Extratropical Interaction and Its Impact on Extended-Range Forecasting. Part I: The Impact of Sea Surface Temperature Anomalies

    Source: Monthly Weather Review:;1994:;volume( 122 ):;issue: 002::page 274
    Author:
    Mo, Kingtse C.
    ,
    Wang, X. L.
    ,
    Tracton, M. S.
    DOI: 10.1175/1520-0493(1994)122<0274:TAEIAI>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The impact of the sea surface temperature (SST) anomalies on predictions in the extratropics has been studied by comparing circulation changes in general circulation model experiments generated with observed and climatological sea surface temperatures for warm and cold Southern Oscillation events. The small samples may be insufficient for drawing firm conclusions, but results suggest that the linkage between tropical and extratropical circulations in the model resembles observed relationships. As the atmosphere responds to the warm (cold) tropical SSTs, the convection in the Pacific intensifies (diminishes). The enhanced (suppressed) convection in the tropics enhances (suppresses) the local Hadley circulation and changes the position and strength of the divergent outflow. This in turn changes the position, shape, and strength of the upper-level subtropical jet streams. After the jets move to their new positions, synoptic eddies organize themselves at the exit regions of the jets. The response time for the upper-level streamfunction in the tropics is about 10 days, but the changes in the position of the subtropical jets occur after 15?20 days. The largest impact on predictions is located in the tropics and downstream in the Pacific-North America and the Pacific-South America regions.
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      Tropical and Extratropical Interaction and Its Impact on Extended-Range Forecasting. Part I: The Impact of Sea Surface Temperature Anomalies

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4203217
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    contributor authorMo, Kingtse C.
    contributor authorWang, X. L.
    contributor authorTracton, M. S.
    date accessioned2017-06-09T16:09:47Z
    date available2017-06-09T16:09:47Z
    date copyright1994/02/01
    date issued1994
    identifier issn0027-0644
    identifier otherams-62336.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4203217
    description abstractThe impact of the sea surface temperature (SST) anomalies on predictions in the extratropics has been studied by comparing circulation changes in general circulation model experiments generated with observed and climatological sea surface temperatures for warm and cold Southern Oscillation events. The small samples may be insufficient for drawing firm conclusions, but results suggest that the linkage between tropical and extratropical circulations in the model resembles observed relationships. As the atmosphere responds to the warm (cold) tropical SSTs, the convection in the Pacific intensifies (diminishes). The enhanced (suppressed) convection in the tropics enhances (suppresses) the local Hadley circulation and changes the position and strength of the divergent outflow. This in turn changes the position, shape, and strength of the upper-level subtropical jet streams. After the jets move to their new positions, synoptic eddies organize themselves at the exit regions of the jets. The response time for the upper-level streamfunction in the tropics is about 10 days, but the changes in the position of the subtropical jets occur after 15?20 days. The largest impact on predictions is located in the tropics and downstream in the Pacific-North America and the Pacific-South America regions.
    publisherAmerican Meteorological Society
    titleTropical and Extratropical Interaction and Its Impact on Extended-Range Forecasting. Part I: The Impact of Sea Surface Temperature Anomalies
    typeJournal Paper
    journal volume122
    journal issue2
    journal titleMonthly Weather Review
    identifier doi10.1175/1520-0493(1994)122<0274:TAEIAI>2.0.CO;2
    journal fristpage274
    journal lastpage290
    treeMonthly Weather Review:;1994:;volume( 122 ):;issue: 002
    contenttypeFulltext
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