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    Atlantic Multidecadal Variability as a Modulator of Precipitation Variability in the Southwest United States

    Source: Journal of Climate:;2018:;volume 031:;issue 014::page 5525
    Author:
    Lee, Dong Eun
    ,
    Ting, Mingfang
    ,
    Vigaud, Nicolas
    ,
    Kushnir, Yochanan
    ,
    Barnston, Anthony G.
    DOI: 10.1175/JCLI-D-17-0372.1
    Publisher: American Meteorological Society
    Abstract: AbstractTwo independent atmospheric general circulation models reveal that the positive (negative) phase of Atlantic multidecadal variability (AMV) can reduce (amplify) the variance of the shorter time-scale (e.g., ENSO related) precipitation fluctuations in the United States, especially in the Southwest, as well as decrease (increase) the long-term seasonal mean precipitation for the cold season. The variance is modulated because of changes in 1) dry day frequency and 2) maximum daily rainfall intensity. With positive AMV forcing, the upper-level warming originating from the increased precipitation over the tropical Atlantic Ocean changes the mean vertical thermal structure over the United States continent to a profile less favorable for rain-inducing upward motions. In addition, a northerly low-level dry advection associated with the local overturning leaves less available column moisture for condensation and precipitation. The opposite conditions occur during cold AMV periods.
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      Atlantic Multidecadal Variability as a Modulator of Precipitation Variability in the Southwest United States

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4262119
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    contributor authorLee, Dong Eun
    contributor authorTing, Mingfang
    contributor authorVigaud, Nicolas
    contributor authorKushnir, Yochanan
    contributor authorBarnston, Anthony G.
    date accessioned2019-09-19T10:09:08Z
    date available2019-09-19T10:09:08Z
    date copyright4/23/2018 12:00:00 AM
    date issued2018
    identifier otherjcli-d-17-0372.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4262119
    description abstractAbstractTwo independent atmospheric general circulation models reveal that the positive (negative) phase of Atlantic multidecadal variability (AMV) can reduce (amplify) the variance of the shorter time-scale (e.g., ENSO related) precipitation fluctuations in the United States, especially in the Southwest, as well as decrease (increase) the long-term seasonal mean precipitation for the cold season. The variance is modulated because of changes in 1) dry day frequency and 2) maximum daily rainfall intensity. With positive AMV forcing, the upper-level warming originating from the increased precipitation over the tropical Atlantic Ocean changes the mean vertical thermal structure over the United States continent to a profile less favorable for rain-inducing upward motions. In addition, a northerly low-level dry advection associated with the local overturning leaves less available column moisture for condensation and precipitation. The opposite conditions occur during cold AMV periods.
    publisherAmerican Meteorological Society
    titleAtlantic Multidecadal Variability as a Modulator of Precipitation Variability in the Southwest United States
    typeJournal Paper
    journal volume31
    journal issue14
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-17-0372.1
    journal fristpage5525
    journal lastpage5542
    treeJournal of Climate:;2018:;volume 031:;issue 014
    contenttypeFulltext
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