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    The Changing Character of Twenty-First-Century Precipitation over the Western United States in the Variable-Resolution CESM

    Source: Journal of Climate:;2017:;volume( 030 ):;issue: 018::page 7555
    Author:
    Huang, Xingying;Ullrich, Paul A.
    DOI: 10.1175/JCLI-D-16-0673.1
    Publisher: American Meteorological Society
    Abstract: AbstractThe changing characters of precipitation frequency and intensity have been comprehensively investigated from the recent historical period to the end of the twenty-first century over the western United States. Variable-resolution Community Earth System Model (VR-CESM) ensemble simulations are applied with a fine grid resolution of ~0.25° over the study area. Simulations are forced with prescribed sea surface temperatures, sea ice extent, and greenhouse gas concentrations from the representative concentration pathway 8.5 (RCP8.5) scenario. VR-CESM is shown to be effective at accurately capturing the spatial patterns of the historical precipitation climatology. The results of VR-CESM output provide significantly regional details with crucial enhancement of precipitation representations over complex terrain. In the Intermountain West and U.S. Southwest, a statistically significant increase in mean precipitation and rainy days through midcentury is observed, although this trend is tempered by the end of the century in response to a decrease in relative humidity. Over the Pacific Northwest, extreme precipitation events are observed to increase significantly as a result of increased cool season integrated vapor transport associated with a moistening of the cool seasons and drying through the warm seasons. In particular, extreme precipitation in this region appears to increase more rapidly than would be predicted by the Clausius?Clapeyron relationship. No clear climate signal emerges in mean precipitation or extreme events in the majority of California, where the precipitation climatology is attributed to large interannual variabilities that are tied closely to ENSO patterns.
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      The Changing Character of Twenty-First-Century Precipitation over the Western United States in the Variable-Resolution CESM

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    contributor authorHuang, Xingying;Ullrich, Paul A.
    date accessioned2018-01-03T11:01:06Z
    date available2018-01-03T11:01:06Z
    date copyright7/3/2017 12:00:00 AM
    date issued2017
    identifier otherjcli-d-16-0673.1.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4246095
    description abstractAbstractThe changing characters of precipitation frequency and intensity have been comprehensively investigated from the recent historical period to the end of the twenty-first century over the western United States. Variable-resolution Community Earth System Model (VR-CESM) ensemble simulations are applied with a fine grid resolution of ~0.25° over the study area. Simulations are forced with prescribed sea surface temperatures, sea ice extent, and greenhouse gas concentrations from the representative concentration pathway 8.5 (RCP8.5) scenario. VR-CESM is shown to be effective at accurately capturing the spatial patterns of the historical precipitation climatology. The results of VR-CESM output provide significantly regional details with crucial enhancement of precipitation representations over complex terrain. In the Intermountain West and U.S. Southwest, a statistically significant increase in mean precipitation and rainy days through midcentury is observed, although this trend is tempered by the end of the century in response to a decrease in relative humidity. Over the Pacific Northwest, extreme precipitation events are observed to increase significantly as a result of increased cool season integrated vapor transport associated with a moistening of the cool seasons and drying through the warm seasons. In particular, extreme precipitation in this region appears to increase more rapidly than would be predicted by the Clausius?Clapeyron relationship. No clear climate signal emerges in mean precipitation or extreme events in the majority of California, where the precipitation climatology is attributed to large interannual variabilities that are tied closely to ENSO patterns.
    publisherAmerican Meteorological Society
    titleThe Changing Character of Twenty-First-Century Precipitation over the Western United States in the Variable-Resolution CESM
    typeJournal Paper
    journal volume30
    journal issue18
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-16-0673.1
    journal fristpage7555
    journal lastpage7575
    treeJournal of Climate:;2017:;volume( 030 ):;issue: 018
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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