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    Influence of the Pacific Decadal Oscillation on Winter Precipitation and Drought during Years of Neutral ENSO in the Western United States

    Source: Weather and Forecasting:;2007:;volume( 022 ):;issue: 001::page 116
    Author:
    Goodrich, Gregory B.
    DOI: 10.1175/WAF983.1
    Publisher: American Meteorological Society
    Abstract: The influence of the Pacific decadal oscillation (PDO) on important hydroclimatic variables during years of neutral ENSO for 84 climate divisions in the western United States is analyzed from 1925 to 1998. When the 34 neutral ENSO years are split by cold (12 yr) and warm (22 yr) PDOs, the resulting winter precipitation patterns are spatially similar to those that occur during years of La Niña?cold PDO and, to a lesser extent, years of El Niño?warm PDO, respectively, although the characteristic ENSO dipole is not evident. The PDO influence is similar when the winter Palmer drought severity index is analyzed, although the core area of influence moves from the Southwest to the northern Rockies. Correlations between Niño-3.4 SSTs and the hydroclimatic variables reverse sign when the neutral ENSO years are split by PDO phase. The greatest difference between correlations occurs in the characteristic dipole between the Pacific Northwest and the desert Southwest. Since seasonal forecast guidance based on ENSO conditions in the tropical Pacific often yields a forecast of ?equal chances? during years of neutral ENSO, forecasters may be able to improve their forecasts for the southwestern United States depending on if the PDO is known to be in the cold (drier than normal) or warm (wetter than normal) phase. However, this can be difficult to implement considering the current uncertainty of the phase of the PDO.
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      Influence of the Pacific Decadal Oscillation on Winter Precipitation and Drought during Years of Neutral ENSO in the Western United States

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4231365
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    contributor authorGoodrich, Gregory B.
    date accessioned2017-06-09T17:35:19Z
    date available2017-06-09T17:35:19Z
    date copyright2007/02/01
    date issued2007
    identifier issn0882-8156
    identifier otherams-87671.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4231365
    description abstractThe influence of the Pacific decadal oscillation (PDO) on important hydroclimatic variables during years of neutral ENSO for 84 climate divisions in the western United States is analyzed from 1925 to 1998. When the 34 neutral ENSO years are split by cold (12 yr) and warm (22 yr) PDOs, the resulting winter precipitation patterns are spatially similar to those that occur during years of La Niña?cold PDO and, to a lesser extent, years of El Niño?warm PDO, respectively, although the characteristic ENSO dipole is not evident. The PDO influence is similar when the winter Palmer drought severity index is analyzed, although the core area of influence moves from the Southwest to the northern Rockies. Correlations between Niño-3.4 SSTs and the hydroclimatic variables reverse sign when the neutral ENSO years are split by PDO phase. The greatest difference between correlations occurs in the characteristic dipole between the Pacific Northwest and the desert Southwest. Since seasonal forecast guidance based on ENSO conditions in the tropical Pacific often yields a forecast of ?equal chances? during years of neutral ENSO, forecasters may be able to improve their forecasts for the southwestern United States depending on if the PDO is known to be in the cold (drier than normal) or warm (wetter than normal) phase. However, this can be difficult to implement considering the current uncertainty of the phase of the PDO.
    publisherAmerican Meteorological Society
    titleInfluence of the Pacific Decadal Oscillation on Winter Precipitation and Drought during Years of Neutral ENSO in the Western United States
    typeJournal Paper
    journal volume22
    journal issue1
    journal titleWeather and Forecasting
    identifier doi10.1175/WAF983.1
    journal fristpage116
    journal lastpage124
    treeWeather and Forecasting:;2007:;volume( 022 ):;issue: 001
    contenttypeFulltext
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