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    An Observed Tropical Oceanic Radiative–Convective Cloud Feedback

    Source: Journal of Climate:;2009:;volume( 023 ):;issue: 008::page 2065
    Author:
    Lebsock, Matthew D.
    ,
    Kummerow, Christian
    ,
    Stephens, Graeme L.
    DOI: 10.1175/2009JCLI3091.1
    Publisher: American Meteorological Society
    Abstract: Anomalies of precipitation, cloud, thermodynamic, and radiation variables are analyzed on the large spatial scale defined by the tropical oceans. In particular, relationships between the mean tropical oceanic precipitation anomaly and radiative anomalies are examined. It is found that tropical mean precipitation is well correlated with cloud properties and radiative fields. In particular, the tropical mean precipitation anomaly is positively correlated with the top of the atmosphere reflected shortwave anomaly and negatively correlated with the emitted longwave anomaly. The tropical mean relationships are found to primarily result from a coherent oscillation of precipitation and the area of high-level cloudiness. The correlations manifest themselves radiatively as a modest decrease in net downwelling radiation at the top of the atmosphere, and a redistribution of energy from the surface to the atmosphere through reduced solar radiation to the surface and decreased longwave emission to space. Integrated over the tropical oceanic domain, the anomalous atmospheric column radiative heating is found to be about 10% of the magnitude of the anomalous latent heating. The temporal signature of the radiative heating is observed in the column mean temperature that indicates a coherent phase-lagged oscillation between atmospheric stability and convection. These relationships are identified as a radiative?convective cloud feedback that is observed on intraseasonal time scales in the tropical atmosphere.
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      An Observed Tropical Oceanic Radiative–Convective Cloud Feedback

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4210505
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    contributor authorLebsock, Matthew D.
    contributor authorKummerow, Christian
    contributor authorStephens, Graeme L.
    date accessioned2017-06-09T16:29:45Z
    date available2017-06-09T16:29:45Z
    date copyright2010/04/01
    date issued2009
    identifier issn0894-8755
    identifier otherams-68897.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4210505
    description abstractAnomalies of precipitation, cloud, thermodynamic, and radiation variables are analyzed on the large spatial scale defined by the tropical oceans. In particular, relationships between the mean tropical oceanic precipitation anomaly and radiative anomalies are examined. It is found that tropical mean precipitation is well correlated with cloud properties and radiative fields. In particular, the tropical mean precipitation anomaly is positively correlated with the top of the atmosphere reflected shortwave anomaly and negatively correlated with the emitted longwave anomaly. The tropical mean relationships are found to primarily result from a coherent oscillation of precipitation and the area of high-level cloudiness. The correlations manifest themselves radiatively as a modest decrease in net downwelling radiation at the top of the atmosphere, and a redistribution of energy from the surface to the atmosphere through reduced solar radiation to the surface and decreased longwave emission to space. Integrated over the tropical oceanic domain, the anomalous atmospheric column radiative heating is found to be about 10% of the magnitude of the anomalous latent heating. The temporal signature of the radiative heating is observed in the column mean temperature that indicates a coherent phase-lagged oscillation between atmospheric stability and convection. These relationships are identified as a radiative?convective cloud feedback that is observed on intraseasonal time scales in the tropical atmosphere.
    publisherAmerican Meteorological Society
    titleAn Observed Tropical Oceanic Radiative–Convective Cloud Feedback
    typeJournal Paper
    journal volume23
    journal issue8
    journal titleJournal of Climate
    identifier doi10.1175/2009JCLI3091.1
    journal fristpage2065
    journal lastpage2078
    treeJournal of Climate:;2009:;volume( 023 ):;issue: 008
    contenttypeFulltext
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