globalchange  > 气候变化事实与影响
DOI: 10.1175/JCLI-D-12-00457.1
Scopus记录号: 2-s2.0-84880264239
论文题名:
Contributions of individual atmospheric diabatic heating processes to the generation of available potential energy
作者: Romanski J.; Rossow W.B.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期:12
起始页码: 4244
结束页码: 4263
语种: 英语
Scopus关键词: Diabatic heating ; Energy budget/balance ; Intertropical convergence zone ; Large-scale dynamics ; Northern Hemispheres ; Southern Hemisphere ; Spatial and temporal distribution ; Temporal and spatial ; Feedback ; Potential energy ; Precipitation (meteorology) ; Heating ; climate feedback ; diabatic process ; eddy ; energy balance ; energy budget ; intertropical convergence zone ; Northern Hemisphere ; potential energy ; radiative forcing ; satellite data ; sensible heat flux ; Southern Hemisphere ; spatial resolution ; troposphere ; winter ; zonal flow
英文摘要: The 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 obtainGz 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. © 2013 American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51867
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作者单位: Center for Climate Systems Research, Columbia University, New York, NY, United States; City College of New York, City University of New York, New York, NY, United States

Recommended Citation:
Romanski J.,Rossow W.B.. Contributions of individual atmospheric diabatic heating processes to the generation of available potential energy[J]. Journal of Climate,2013-01-01,26(12)
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