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    Warm Winter Storms in Central Chile

    Source: Journal of Hydrometeorology:;2013:;Volume( 014 ):;issue: 005::page 1515
    Author:
    Garreaud, R.
    DOI: 10.1175/JHM-D-12-0135.1
    Publisher: American Meteorological Society
    Abstract: entral Chile is a densely populated region along the west coast of subtropical South America (30°?36°S), limited to the east by the Andes. Precipitation is concentrated in austral winter, mostly associated with the passage of cold fronts. The freezing level over central Chile is typically between 1500 and 2500 m when precipitation is present. In about a third of the cases, however, precipitation occurs accompanied by warm temperatures and freezing levels above 3000 m, leading to a sizeable increment in the pluvial area of Andean basins and setting the stage for hydrometeorological hazards. Here, warm winter storms in central Chile are studied, including a statistical description of their occurrence and an estimate of their hydrological impacts. Remote-sensed data and high-resolution reanalysis are used to explore the synoptic-scale environment of a typical case, generalized later by a compositing analysis. The structure of warm storms is also contrasted with that of the more recurrent cold cases. Precipitation during warm events occurs in the warm sector of a slow-moving cold front because of the intense moisture flux against the mountains in connection with a land-falling atmospheric river. This is in turn driven by a strong zonal jet aloft and reduced mechanical blocking upstream of the Andes. On a broader scale, a key element is the presence of a slowly moving anticyclone over the south Pacific, fostering advection of cold air into midlatitudes. The intense and persistent zonal jet stretches a moist-air corridor from the central Pacific to the west coast of South America.
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      Warm Winter Storms in Central Chile

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    contributor authorGarreaud, R.
    date accessioned2017-06-09T17:14:55Z
    date available2017-06-09T17:14:55Z
    date copyright2013/10/01
    date issued2013
    identifier issn1525-755X
    identifier otherams-81801.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4224843
    description abstractentral Chile is a densely populated region along the west coast of subtropical South America (30°?36°S), limited to the east by the Andes. Precipitation is concentrated in austral winter, mostly associated with the passage of cold fronts. The freezing level over central Chile is typically between 1500 and 2500 m when precipitation is present. In about a third of the cases, however, precipitation occurs accompanied by warm temperatures and freezing levels above 3000 m, leading to a sizeable increment in the pluvial area of Andean basins and setting the stage for hydrometeorological hazards. Here, warm winter storms in central Chile are studied, including a statistical description of their occurrence and an estimate of their hydrological impacts. Remote-sensed data and high-resolution reanalysis are used to explore the synoptic-scale environment of a typical case, generalized later by a compositing analysis. The structure of warm storms is also contrasted with that of the more recurrent cold cases. Precipitation during warm events occurs in the warm sector of a slow-moving cold front because of the intense moisture flux against the mountains in connection with a land-falling atmospheric river. This is in turn driven by a strong zonal jet aloft and reduced mechanical blocking upstream of the Andes. On a broader scale, a key element is the presence of a slowly moving anticyclone over the south Pacific, fostering advection of cold air into midlatitudes. The intense and persistent zonal jet stretches a moist-air corridor from the central Pacific to the west coast of South America.
    publisherAmerican Meteorological Society
    titleWarm Winter Storms in Central Chile
    typeJournal Paper
    journal volume14
    journal issue5
    journal titleJournal of Hydrometeorology
    identifier doi10.1175/JHM-D-12-0135.1
    journal fristpage1515
    journal lastpage1534
    treeJournal of Hydrometeorology:;2013:;Volume( 014 ):;issue: 005
    contenttypeFulltext
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