DOI: 10.1175/2011JCLI4234.1
Scopus记录号: 2-s2.0-84862093734
论文题名: Atmospheric entropy. Part I: Climate dissipation structure
作者: Li J. ; Chylek P.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 9 起始页码: 3173
结束页码: 3190
语种: 英语
Scopus关键词: Balance equations
; Climate
; Diabatic heating
; Entropy production
; Extratropics
; Higher latitudes
; Large-scale eddies
; Lower stratosphere
; Midlatitudes
; Northern Hemispheres
; Polar Regions
; Surface entropies
; Thermal structure
; Total entropy
; Western Atlantic
; Western Pacific
; Upper atmosphere
; Entropy
; atmospheric moisture
; atmospheric sink
; boundary layer
; climate conditions
; diabatic process
; eddy
; entropy
; heating
; Northern Hemisphere
; thermal structure
; Atlantic Ocean
; Atlantic Ocean (West)
; Pacific Ocean
; Pacific Ocean (Northwest)
; Pacific Ocean (West)
英文摘要: Atmospheric entropy and its association with climate dissipation are investigated. The balance equation for entropy is derived through the mean and transient thermal and moisture equations. The entropy production contains the internal and external parts. The external entropy production, due to small-scale diabatic heating, can be evaluated by the surface entropy flux. Using NCEP data from 1998 to 2007, it is found that the surface entropy flux is much larger in the tropics than in the extratropics. In the December-February (DJF) Northern Hemisphere, there are two strong positive centers of boundary layer supply of entropy: one is in the northwestern Pacific and the other is in the western Atlantic. The external entropy production, due to large-scale eddy flow, can be evaluated by the convergence of eddy entropy flow. It is found that the large-scale eddy entropy flow is divergent in the midlatitudes and convergent in the higher latitudes. The internal entropy production shows the dissipation to the orderly thermal structure. For the internal entropy production due to a large-scale eddy, it is shown that in the Northern Hemisphere during DJF there are three maxima, located in the western Pacific, western Atlantic, and northern polar regions. This illustrates the dissipation of the highly organized thermal structure in such regions. An interesting finding is that the large-scale eddy internal entropy production is negative in the lower stratosphere. It is found that the long-time-averaged global mean of the internal entropy production is 0.037 49 W m -2 K -1. By including the entropy sink from radiation, the total entropy production is close to balance. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52401
Appears in Collections: 气候变化事实与影响
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作者单位: Canadian Centre for Climate Modelling and Analysis, Science and Technology Branch, Environment Canada, University of Victoria, Victoria, BC, Canada; Space and Remote Sensing Sciences, Los Alamos National Laboratory, Los Alamos, NM, United States
Recommended Citation:
Li J.,Chylek P.. Atmospheric entropy. Part I: Climate dissipation structure[J]. Journal of Climate,2012-01-01,25(9)