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    Atmospheric Rivers as Drought Busters on the U.S. West Coast

    Source: Journal of Hydrometeorology:;2013:;Volume( 014 ):;issue: 006::page 1721
    Author:
    Dettinger, Michael D.
    DOI: 10.1175/JHM-D-13-02.1
    Publisher: American Meteorological Society
    Abstract: tmospheric rivers (ARs) have, in recent years, been recognized as the cause of the large majority of major floods in rivers all along the U.S. West Coast and as the source of 30%?50% of all precipitation in the same region. The present study surveys the frequency with which ARs have played a critical role as a common cause of the end of droughts on the West Coast. This question was based on the observation that, in most cases, droughts end abruptly as a result of the arrival of an especially wet month or, more exactly, a few very large storms. This observation is documented using both Palmer Drought Severity Index and 6-month Standardized Precipitation Index measures of drought occurrence for climate divisions across the conterminous United States from 1895 to 2010. When the individual storm sequences that contributed most to the wet months that broke historical West Coast droughts from 1950 to 2010 were evaluated, 33%?74% of droughts were broken by the arrival of landfalling AR storms. In the Pacific Northwest, 60%?74% of all persistent drought endings have been brought about by the arrival of AR storms. In California, about 33%?40% of all persistent drought endings have been brought about by landfalling AR storms, with more localized low pressure systems responsible for many of the remaining drought breaks.
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      Atmospheric Rivers as Drought Busters on the U.S. West Coast

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    contributor authorDettinger, Michael D.
    date accessioned2017-06-09T17:15:33Z
    date available2017-06-09T17:15:33Z
    date copyright2013/12/01
    date issued2013
    identifier issn1525-755X
    identifier otherams-81980.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4225042
    description abstracttmospheric rivers (ARs) have, in recent years, been recognized as the cause of the large majority of major floods in rivers all along the U.S. West Coast and as the source of 30%?50% of all precipitation in the same region. The present study surveys the frequency with which ARs have played a critical role as a common cause of the end of droughts on the West Coast. This question was based on the observation that, in most cases, droughts end abruptly as a result of the arrival of an especially wet month or, more exactly, a few very large storms. This observation is documented using both Palmer Drought Severity Index and 6-month Standardized Precipitation Index measures of drought occurrence for climate divisions across the conterminous United States from 1895 to 2010. When the individual storm sequences that contributed most to the wet months that broke historical West Coast droughts from 1950 to 2010 were evaluated, 33%?74% of droughts were broken by the arrival of landfalling AR storms. In the Pacific Northwest, 60%?74% of all persistent drought endings have been brought about by the arrival of AR storms. In California, about 33%?40% of all persistent drought endings have been brought about by landfalling AR storms, with more localized low pressure systems responsible for many of the remaining drought breaks.
    publisherAmerican Meteorological Society
    titleAtmospheric Rivers as Drought Busters on the U.S. West Coast
    typeJournal Paper
    journal volume14
    journal issue6
    journal titleJournal of Hydrometeorology
    identifier doi10.1175/JHM-D-13-02.1
    journal fristpage1721
    journal lastpage1732
    treeJournal of Hydrometeorology:;2013:;Volume( 014 ):;issue: 006
    contenttypeFulltext
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