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    Dominant Modes of Moisture Flux Anomalies over North America

    Source: Journal of Hydrometeorology:;2005:;Volume( 006 ):;issue: 002::page 194
    Author:
    Dominguez, Francina
    ,
    Kumar, Praveen
    DOI: 10.1175/JHM417.1
    Publisher: American Meteorological Society
    Abstract: This study investigates the principal modes of seasonal moisture flux transport over North America, analyzing their possible dependence on large-scale atmospheric circulation patterns. It uses 23 yr (1979?2001) of 6-hourly data from the NCEP?NCAR reanalysis I project. Complex empirical orthogonal function (complex-EOF) analysis is implemented on the vertically integrated and seasonally averaged moisture flux, to identify the dominant modes. For every season, the characteristic spatial pattern of the two most dominant modes is compared to the geopotential height anomaly field and precipitation anomaly field using correlation analysis. The two dominant winter modes capture the variability in the moisture flux field associated with extreme precipitation events over the western coast of the United States. The first winter mode captures 52% of the variability of the season and is related to the strong ENSO events of 1982/83 and 1997/98 (El Niño) and 1989 (La Niña). The second winter mode captures anomalous high moisture flux over the southwest related to the east Pacific teleconnection pattern. The intense moisture transport associated with high-precipitation events in the central United States (including the 1993 flood) is captured by summer mode 1, while the second mode of the summer season captures the moisture flux variability related to the 1983 and 1988 droughts. The results show that these summer flood and drought events are characterized by very different moisture flux anomalies and are not the positive and negative phases of a given mode. The use of complex-EOF analysis captures extreme hydrologic events as characteristic modes of interannual variability and allows a better understanding of the atmospheric circulation patterns associated with these events.
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      Dominant Modes of Moisture Flux Anomalies over North America

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    contributor authorDominguez, Francina
    contributor authorKumar, Praveen
    date accessioned2017-06-09T17:13:43Z
    date available2017-06-09T17:13:43Z
    date copyright2005/04/01
    date issued2005
    identifier issn1525-755X
    identifier otherams-81424.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4224426
    description abstractThis study investigates the principal modes of seasonal moisture flux transport over North America, analyzing their possible dependence on large-scale atmospheric circulation patterns. It uses 23 yr (1979?2001) of 6-hourly data from the NCEP?NCAR reanalysis I project. Complex empirical orthogonal function (complex-EOF) analysis is implemented on the vertically integrated and seasonally averaged moisture flux, to identify the dominant modes. For every season, the characteristic spatial pattern of the two most dominant modes is compared to the geopotential height anomaly field and precipitation anomaly field using correlation analysis. The two dominant winter modes capture the variability in the moisture flux field associated with extreme precipitation events over the western coast of the United States. The first winter mode captures 52% of the variability of the season and is related to the strong ENSO events of 1982/83 and 1997/98 (El Niño) and 1989 (La Niña). The second winter mode captures anomalous high moisture flux over the southwest related to the east Pacific teleconnection pattern. The intense moisture transport associated with high-precipitation events in the central United States (including the 1993 flood) is captured by summer mode 1, while the second mode of the summer season captures the moisture flux variability related to the 1983 and 1988 droughts. The results show that these summer flood and drought events are characterized by very different moisture flux anomalies and are not the positive and negative phases of a given mode. The use of complex-EOF analysis captures extreme hydrologic events as characteristic modes of interannual variability and allows a better understanding of the atmospheric circulation patterns associated with these events.
    publisherAmerican Meteorological Society
    titleDominant Modes of Moisture Flux Anomalies over North America
    typeJournal Paper
    journal volume6
    journal issue2
    journal titleJournal of Hydrometeorology
    identifier doi10.1175/JHM417.1
    journal fristpage194
    journal lastpage209
    treeJournal of Hydrometeorology:;2005:;Volume( 006 ):;issue: 002
    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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