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    The Influence of Large-Scale Flow on Fall Precipitation Systems in the Great Lakes Basin

    Source: Journal of Climate:;2002:;volume( 015 ):;issue: 014::page 1943
    Author:
    Grover, Emily K.
    ,
    Sousounis, Peter J.
    DOI: 10.1175/1520-0442(2002)015<1943:TIOLSF>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: A synoptic climatology is presented of the precipitation mechanisms that affect the Great Lakes Basin. The focus is on fall because increasing precipitation in this season has contributed to record high lake levels since the 1960s and because the causes can be synoptically evaluated. Precipitation events were identified for the period 1935?95 from NOAA Daily Weather Maps. Precipitation days were classified as one of nine types. Trends in the precipitation classifications, 24-h precipitation totals, and the frequency and intensity of precipitation days and events were analyzed. It was found that the precipitation increased 15% over the basin and 35% at Grand Rapids, Michigan, from 1935?65 to 1966?95. The increased precipitation was driven by an increase in the amount of precipitation per day (from low pressure systems and warm, stationary, and occluded fronts) and an increase in the frequency of precipitation days (from troughs and cold, warm, stationary, and occluded fronts). All classifications except for isolated convection contributed to the increase. Increases from warm, stationary, and occluded fronts contributed the most. Analysis of precipitation mechanisms and large-scale circulation features for two 10-yr periods from 1950 to 1959 and from 1980 to 1989 revealed that higher precipitation amounts were associated with a more zonal flow pattern that existed over the United States during 1980?89. This pattern was accompanied by more baroclinicity and moisture over the Rockies, a stronger upper-troposphere subtropical jet, and stronger low-level flow from the Gulf of Mexico. These features allowed a greater number of southern systems with more moisture to influence the region. Specifically, the increased frequency of low pressure systems approaching from the south(west) and their associated more rapid deepening rates allowed more precipitation from warm, stationary, and occluded fronts. The similarities in the synoptic precipitation classifications and precipitation amounts between the two 10-yr periods and the two 30-yr periods examined suggest that more meridional flow was present for much of the 1935?65 period and that more zonal flow was present for much of the 1966?95 period.
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      The Influence of Large-Scale Flow on Fall Precipitation Systems in the Great Lakes Basin

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4201412
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    contributor authorGrover, Emily K.
    contributor authorSousounis, Peter J.
    date accessioned2017-06-09T16:05:31Z
    date available2017-06-09T16:05:31Z
    date copyright2002/07/01
    date issued2002
    identifier issn0894-8755
    identifier otherams-6071.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4201412
    description abstractA synoptic climatology is presented of the precipitation mechanisms that affect the Great Lakes Basin. The focus is on fall because increasing precipitation in this season has contributed to record high lake levels since the 1960s and because the causes can be synoptically evaluated. Precipitation events were identified for the period 1935?95 from NOAA Daily Weather Maps. Precipitation days were classified as one of nine types. Trends in the precipitation classifications, 24-h precipitation totals, and the frequency and intensity of precipitation days and events were analyzed. It was found that the precipitation increased 15% over the basin and 35% at Grand Rapids, Michigan, from 1935?65 to 1966?95. The increased precipitation was driven by an increase in the amount of precipitation per day (from low pressure systems and warm, stationary, and occluded fronts) and an increase in the frequency of precipitation days (from troughs and cold, warm, stationary, and occluded fronts). All classifications except for isolated convection contributed to the increase. Increases from warm, stationary, and occluded fronts contributed the most. Analysis of precipitation mechanisms and large-scale circulation features for two 10-yr periods from 1950 to 1959 and from 1980 to 1989 revealed that higher precipitation amounts were associated with a more zonal flow pattern that existed over the United States during 1980?89. This pattern was accompanied by more baroclinicity and moisture over the Rockies, a stronger upper-troposphere subtropical jet, and stronger low-level flow from the Gulf of Mexico. These features allowed a greater number of southern systems with more moisture to influence the region. Specifically, the increased frequency of low pressure systems approaching from the south(west) and their associated more rapid deepening rates allowed more precipitation from warm, stationary, and occluded fronts. The similarities in the synoptic precipitation classifications and precipitation amounts between the two 10-yr periods and the two 30-yr periods examined suggest that more meridional flow was present for much of the 1935?65 period and that more zonal flow was present for much of the 1966?95 period.
    publisherAmerican Meteorological Society
    titleThe Influence of Large-Scale Flow on Fall Precipitation Systems in the Great Lakes Basin
    typeJournal Paper
    journal volume15
    journal issue14
    journal titleJournal of Climate
    identifier doi10.1175/1520-0442(2002)015<1943:TIOLSF>2.0.CO;2
    journal fristpage1943
    journal lastpage1956
    treeJournal of Climate:;2002:;volume( 015 ):;issue: 014
    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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