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    Simulation of the Atmospheric Circulation Using the NCAR Global Circulation Model with Ice Age Boundary Conditions

    Source: Journal of Applied Meteorology:;1974:;volume( 013 ):;issue: 003::page 305
    Author:
    Williams, Jill
    ,
    Barry, R. G.
    ,
    Washington, W. M.
    DOI: 10.1175/1520-0450(1974)013<0305:SOTACU>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The NCAR global circulation model has been used to simulate global atmospheric conditions using boundary conditions representing those of the present day and those of the Würm/Wisconsin glacial maximum at about 20,000 years ago, for January and July cases. The mean zonal wind strength in the July ice age case in the middle latitudes of the Northern Hemisphere was comparable with present winter conditions. Also in the ice age cases, the upper westerlies were not apparently displaced south of the Laurentide ice sheet. The Icelandic and Aleutian lows in January were displaced 10° southward, the Siberian high remained unchanged from the control situation, and a new low center was found over eastern Europe and the European USSR. In July high pressure developed over most of Asia. Maps of cyclone frequency in a 30-day period showed the influence of major ice sheets and sea ice in displacing zones of cyclone activity southward in January. Frequent cyclones occurred over central North America and there was a continuation of cyclone activity in the North Atlantic and from eastern Europe into Asia. There was virtually no cyclonic activity near the Laurentide ice sheet in July. Cloud cover and precipitation were also analyzed. Changes in precipitation for the glacial maximum cases are mainly quantitative rather than affecting its spatial distribution. The zonal averages show small changes for the Southern Hemisphere. In the Northern Hemisphere precipitation was decreased slightly in winter with most pronounced effects between 0?10N and 55?70N. The summer shows a dramatic reduction of precipitation north of 10N. There is broad agreement between these paleo-climatological reconstructions and those of other studies using different models.
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      Simulation of the Atmospheric Circulation Using the NCAR Global Circulation Model with Ice Age Boundary Conditions

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4230878
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    • Journal of Applied Meteorology

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    contributor authorWilliams, Jill
    contributor authorBarry, R. G.
    contributor authorWashington, W. M.
    date accessioned2017-06-09T17:33:41Z
    date available2017-06-09T17:33:41Z
    date copyright1974/04/01
    date issued1974
    identifier issn0021-8952
    identifier otherams-8723.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4230878
    description abstractThe NCAR global circulation model has been used to simulate global atmospheric conditions using boundary conditions representing those of the present day and those of the Würm/Wisconsin glacial maximum at about 20,000 years ago, for January and July cases. The mean zonal wind strength in the July ice age case in the middle latitudes of the Northern Hemisphere was comparable with present winter conditions. Also in the ice age cases, the upper westerlies were not apparently displaced south of the Laurentide ice sheet. The Icelandic and Aleutian lows in January were displaced 10° southward, the Siberian high remained unchanged from the control situation, and a new low center was found over eastern Europe and the European USSR. In July high pressure developed over most of Asia. Maps of cyclone frequency in a 30-day period showed the influence of major ice sheets and sea ice in displacing zones of cyclone activity southward in January. Frequent cyclones occurred over central North America and there was a continuation of cyclone activity in the North Atlantic and from eastern Europe into Asia. There was virtually no cyclonic activity near the Laurentide ice sheet in July. Cloud cover and precipitation were also analyzed. Changes in precipitation for the glacial maximum cases are mainly quantitative rather than affecting its spatial distribution. The zonal averages show small changes for the Southern Hemisphere. In the Northern Hemisphere precipitation was decreased slightly in winter with most pronounced effects between 0?10N and 55?70N. The summer shows a dramatic reduction of precipitation north of 10N. There is broad agreement between these paleo-climatological reconstructions and those of other studies using different models.
    publisherAmerican Meteorological Society
    titleSimulation of the Atmospheric Circulation Using the NCAR Global Circulation Model with Ice Age Boundary Conditions
    typeJournal Paper
    journal volume13
    journal issue3
    journal titleJournal of Applied Meteorology
    identifier doi10.1175/1520-0450(1974)013<0305:SOTACU>2.0.CO;2
    journal fristpage305
    journal lastpage317
    treeJournal of Applied Meteorology:;1974:;volume( 013 ):;issue: 003
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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