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    Variations in Low Cloud Cover over the United States during the Second Half of the Twentieth Century

    Source: Journal of Climate:;2004:;volume( 017 ):;issue: 009::page 1883
    Author:
    Sun, Bomin
    ,
    Groisman, Pavel Ya
    DOI: 10.1175/1520-0442(2004)017<1883:VILCCO>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Several changes in U.S. observational practice [in particular, the introduction of the Automated Surface Observing System (ASOS) in the early 1990s] have led to a challenging heterogeneity of time series of most ground-based cloud observations. In this article, an attempt is made to preserve/restore the time series of average low cloud cover (LCC) over the country up to the year 2001 using cloud sky condition and cloud-base height information collected in the national archive data and to describe its spatial and temporal variability. The switch from human observations to ASOS can be bridged through the use of frequency of overcast/broken cloudiness. During the past 52 yr, the nationwide LCC appears to exhibit a significant increase but all of this increase occurred prior to the early 1980s and thereafter tends to decrease. This finding is consistent with similar changes in the frequency of days with precipitation. When the cloud-type information was still available (i.e., during the pre-ASOS period), it was found that the overall LCC increase was due to the increase in stratiform and cumulonimbus cloud occurrences while cumulus cloud frequency decreased.
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      Variations in Low Cloud Cover over the United States during the Second Half of the Twentieth Century

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4207244
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    contributor authorSun, Bomin
    contributor authorGroisman, Pavel Ya
    date accessioned2017-06-09T16:20:06Z
    date available2017-06-09T16:20:06Z
    date copyright2004/05/01
    date issued2004
    identifier issn0894-8755
    identifier otherams-6596.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4207244
    description abstractSeveral changes in U.S. observational practice [in particular, the introduction of the Automated Surface Observing System (ASOS) in the early 1990s] have led to a challenging heterogeneity of time series of most ground-based cloud observations. In this article, an attempt is made to preserve/restore the time series of average low cloud cover (LCC) over the country up to the year 2001 using cloud sky condition and cloud-base height information collected in the national archive data and to describe its spatial and temporal variability. The switch from human observations to ASOS can be bridged through the use of frequency of overcast/broken cloudiness. During the past 52 yr, the nationwide LCC appears to exhibit a significant increase but all of this increase occurred prior to the early 1980s and thereafter tends to decrease. This finding is consistent with similar changes in the frequency of days with precipitation. When the cloud-type information was still available (i.e., during the pre-ASOS period), it was found that the overall LCC increase was due to the increase in stratiform and cumulonimbus cloud occurrences while cumulus cloud frequency decreased.
    publisherAmerican Meteorological Society
    titleVariations in Low Cloud Cover over the United States during the Second Half of the Twentieth Century
    typeJournal Paper
    journal volume17
    journal issue9
    journal titleJournal of Climate
    identifier doi10.1175/1520-0442(2004)017<1883:VILCCO>2.0.CO;2
    journal fristpage1883
    journal lastpage1888
    treeJournal of Climate:;2004:;volume( 017 ):;issue: 009
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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