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    Role of Terrestrial Hydrologic Memory in Modulating ENSO Impacts in North America

    Source: Journal of Climate:;2002:;volume( 015 ):;issue: 024::page 3569
    Author:
    Chen, Ji
    ,
    Kumar, Praveen
    DOI: 10.1175/1520-0442(2003)015<3569:ROTHMI>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Relationships among the terrestrial hydrologic processes over the North American continent associated with the El Niño?Southern Oscillation (ENSO) are investigated using a large-area basin-scale land surface model driven by the European Centre for Medium-Range Weather Forecasts Re-Analyses 15-yr (1979?93) dataset. The modeling approach allows for the study of the relationships of ENSO with several hydrologic variables simultaneously, such as soil water storage, basin runoff, snow-water equivalent, and precipitation. The cross-correlation coefficients between terrestrial variables and the ENSO index are computed. The runoff from the northern part of North America was found to be most often negatively correlated with ENSO, and there are four distinct coherent regions over the continent where the runoff anomalies are positively correlated. The terrestrial systems have a delayed response to the ENSO signal, as compared to the precipitation, and the delay may range from a month to a season or longer. The shorter and longer delays are typically associated with rainfall runoff, and snow accumulation and melt processes, respectively. The soil moisture storage plays a very vital role in delaying the effects of the climate variability on the terrestrial hydrologic processes and in extending the influences of the El Niño or La Niña events on the terrestrial climate.
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      Role of Terrestrial Hydrologic Memory in Modulating ENSO Impacts in North America

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4202789
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    contributor authorChen, Ji
    contributor authorKumar, Praveen
    date accessioned2017-06-09T16:08:44Z
    date available2017-06-09T16:08:44Z
    date copyright2002/12/01
    date issued2002
    identifier issn0894-8755
    identifier otherams-6195.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4202789
    description abstractRelationships among the terrestrial hydrologic processes over the North American continent associated with the El Niño?Southern Oscillation (ENSO) are investigated using a large-area basin-scale land surface model driven by the European Centre for Medium-Range Weather Forecasts Re-Analyses 15-yr (1979?93) dataset. The modeling approach allows for the study of the relationships of ENSO with several hydrologic variables simultaneously, such as soil water storage, basin runoff, snow-water equivalent, and precipitation. The cross-correlation coefficients between terrestrial variables and the ENSO index are computed. The runoff from the northern part of North America was found to be most often negatively correlated with ENSO, and there are four distinct coherent regions over the continent where the runoff anomalies are positively correlated. The terrestrial systems have a delayed response to the ENSO signal, as compared to the precipitation, and the delay may range from a month to a season or longer. The shorter and longer delays are typically associated with rainfall runoff, and snow accumulation and melt processes, respectively. The soil moisture storage plays a very vital role in delaying the effects of the climate variability on the terrestrial hydrologic processes and in extending the influences of the El Niño or La Niña events on the terrestrial climate.
    publisherAmerican Meteorological Society
    titleRole of Terrestrial Hydrologic Memory in Modulating ENSO Impacts in North America
    typeJournal Paper
    journal volume15
    journal issue24
    journal titleJournal of Climate
    identifier doi10.1175/1520-0442(2003)015<3569:ROTHMI>2.0.CO;2
    journal fristpage3569
    journal lastpage3585
    treeJournal of Climate:;2002:;volume( 015 ):;issue: 024
    contenttypeFulltext
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