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    Contributions of Individual Atmospheric Diabatic Heating Processes to the Generation of Available Potential Energy

    Source: Journal of Climate:;2013:;volume( 026 ):;issue: 012::page 4244
    Author:
    Romanski, Joy
    ,
    Rossow, William B.
    DOI: 10.1175/JCLI-D-12-00457.1
    Publisher: American Meteorological Society
    Abstract: he generation of zonal and eddy available potential energy (Gz and Ge) as formulated by Lorenz are computed on a global-, daily-, and synoptic-scale basis to consider the contribution of each diabatic heating component separately and in combination. Using global, mostly satellite-derived datasets for the diabatic heating components and the temperature enables us to obtain Gz and, especially, Ge from observations for the first time and at higher temporal and spatial resolution than previously possible. The role of clouds in maintaining G is investigated.The global annual mean Gz is 1.52 W m?2. Values reach a minimum of 0.63 W m?2 in the Northern Hemisphere during spring and a maximum of 2.27 W m?2 in the Southern Hemisphere during winter. The largest contributors to Gz are latent heating in the tropical upper troposphere, associated with the intertropical convergence zone in the summer hemisphere and surface sensible heat fluxes in the winter pole. Diabatic cooling by radiative fluxes (mostly longwave) generally destroys Gz.The value of Ge is negative and is about an order of magnitude smaller than Gz, with a global annual mean of ?0.29 W m?2. However, the small value of Ge results from the cancellation of the contributions from the individual diabatic heating terms, which are actually roughly similar in magnitude to their Gz contributions.The results presented herein suggest that the large-scale dynamics of the atmosphere organize the spatial and temporal distribution of clouds and precipitation in such a way as to increase the energy available to drive the circulation, a kind of positive feedback.
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      Contributions of Individual Atmospheric Diabatic Heating Processes to the Generation of Available Potential Energy

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    contributor authorRomanski, Joy
    contributor authorRossow, William B.
    date accessioned2017-06-09T17:07:02Z
    date available2017-06-09T17:07:02Z
    date copyright2013/06/01
    date issued2013
    identifier issn0894-8755
    identifier otherams-79638.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4222440
    description abstracthe generation of zonal and eddy available potential energy (Gz and Ge) as formulated by Lorenz are computed on a global-, daily-, and synoptic-scale basis to consider the contribution of each diabatic heating component separately and in combination. Using global, mostly satellite-derived datasets for the diabatic heating components and the temperature enables us to obtain Gz and, especially, Ge from observations for the first time and at higher temporal and spatial resolution than previously possible. The role of clouds in maintaining G is investigated.The global annual mean Gz is 1.52 W m?2. Values reach a minimum of 0.63 W m?2 in the Northern Hemisphere during spring and a maximum of 2.27 W m?2 in the Southern Hemisphere during winter. The largest contributors to Gz are latent heating in the tropical upper troposphere, associated with the intertropical convergence zone in the summer hemisphere and surface sensible heat fluxes in the winter pole. Diabatic cooling by radiative fluxes (mostly longwave) generally destroys Gz.The value of Ge is negative and is about an order of magnitude smaller than Gz, with a global annual mean of ?0.29 W m?2. However, the small value of Ge results from the cancellation of the contributions from the individual diabatic heating terms, which are actually roughly similar in magnitude to their Gz contributions.The results presented herein suggest that the large-scale dynamics of the atmosphere organize the spatial and temporal distribution of clouds and precipitation in such a way as to increase the energy available to drive the circulation, a kind of positive feedback.
    publisherAmerican Meteorological Society
    titleContributions of Individual Atmospheric Diabatic Heating Processes to the Generation of Available Potential Energy
    typeJournal Paper
    journal volume26
    journal issue12
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-12-00457.1
    journal fristpage4244
    journal lastpage4263
    treeJournal of Climate:;2013:;volume( 026 ):;issue: 012
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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