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    Sensitivity of 30-Day Dynamical Forecasts to Continental Snow cover

    Source: Journal of Climate:;1988:;volume( 001 ):;issue: 007::page 739
    Author:
    Walsh, John E.
    ,
    Ross, Becky
    DOI: 10.1175/1520-0442(1988)001<0739:SODDFT>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Several series of 30-day simulations with a global simulation model are used to evaluate the sensitivities to continental snow cover over North America and Eurasia. The model is initialized with National Meteorological Center analyses for specific dates during the winter of 1976/77 through 1983/84, and snow cover in each case is prescribed according to 1) the distribution derived from observational data; and 2) the distribution containing a corresponding anomaly of the opposite sign. In ten pairs of midwinter forecasts, the major effect of extensive snow cover in eastern North America is a reduction of the near-surface air temperature in the vicinity of the snow anomaly. When snow cover is extensive, sea level pressures are somewhat lower and precipitation amounts somewhat higher offshore of the East Coast; sea level pressures are generally higher inland. In a set of six March cases, positive anomalies of Eurasian snow cover reduce the air temperatures by at least several degrees ceisius throughout the lower half of the troposphere in the region over and downstream of the snow anomaly. The positive Eurasian snow anomalies also produce systematically lower pressures and upper-air heights in the Aleutian region, higher pressures in the Asian Arctic, and lower pressures over western Europe and the extreme northeastern Atlantic. In the Eurasian experiments, the 30-day forecast pressures for the Eurasian hemisphere vary with snow coverage in a manner consistent with the observed pressure fields of the same months.
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      Sensitivity of 30-Day Dynamical Forecasts to Continental Snow cover

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    contributor authorWalsh, John E.
    contributor authorRoss, Becky
    date accessioned2017-06-09T15:07:55Z
    date available2017-06-09T15:07:55Z
    date copyright1988/07/01
    date issued1988
    identifier issn0894-8755
    identifier otherams-3522.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4173090
    description abstractSeveral series of 30-day simulations with a global simulation model are used to evaluate the sensitivities to continental snow cover over North America and Eurasia. The model is initialized with National Meteorological Center analyses for specific dates during the winter of 1976/77 through 1983/84, and snow cover in each case is prescribed according to 1) the distribution derived from observational data; and 2) the distribution containing a corresponding anomaly of the opposite sign. In ten pairs of midwinter forecasts, the major effect of extensive snow cover in eastern North America is a reduction of the near-surface air temperature in the vicinity of the snow anomaly. When snow cover is extensive, sea level pressures are somewhat lower and precipitation amounts somewhat higher offshore of the East Coast; sea level pressures are generally higher inland. In a set of six March cases, positive anomalies of Eurasian snow cover reduce the air temperatures by at least several degrees ceisius throughout the lower half of the troposphere in the region over and downstream of the snow anomaly. The positive Eurasian snow anomalies also produce systematically lower pressures and upper-air heights in the Aleutian region, higher pressures in the Asian Arctic, and lower pressures over western Europe and the extreme northeastern Atlantic. In the Eurasian experiments, the 30-day forecast pressures for the Eurasian hemisphere vary with snow coverage in a manner consistent with the observed pressure fields of the same months.
    publisherAmerican Meteorological Society
    titleSensitivity of 30-Day Dynamical Forecasts to Continental Snow cover
    typeJournal Paper
    journal volume1
    journal issue7
    journal titleJournal of Climate
    identifier doi10.1175/1520-0442(1988)001<0739:SODDFT>2.0.CO;2
    journal fristpage739
    journal lastpage754
    treeJournal of Climate:;1988:;volume( 001 ):;issue: 007
    contenttypeFulltext
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