DOI: 10.1175/JCLI-D-13-00654.1
Scopus记录号: 2-s2.0-84919683157
论文题名: Radiative-convective equilibrium over a land surface
作者: Rochetin N. ; Lintner B.R. ; Findell K.L. ; Sobel A.H. ; Gentine P.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 23 起始页码: 8611
结束页码: 8629
语种: 英语
Scopus关键词: Heat flux
; Moisture
; Rain
; Surface measurement
; General circulation model
; Initial temperatures
; Internal variability
; Land surface modeling
; Multiple equilibrium
; Radiative-convective equilibrium
; Surface precipitation
; Vertical temperature profile
; Atmospheric temperature
; diurnal variation
; general circulation model
; heat flux
; land surface
; radiative forcing
; surface temperature
; temperature profile
; water content
英文摘要: Radiative-convective equilibrium (RCE) describes an idealized state of the atmosphere in which the vertical temperature profile is determined by a balance between radiative and convective fluxes. While RCE has been applied extensively over oceans, its application over the land surface has been limited. The present study explores the properties of RCE over land using an atmospheric single-column model (SCM) from the Laboratoire de Météorologie Dynamique-Zoom, version 5B (LMDZ5B) general circulation model coupled in temperature and moisture to a land surface model using a simplified bucket model with finite moisture capacity. Given the presence of a large-amplitude diurnal heat flux cycle, the resultant RCE exhibits multiple equilibria when conditions are neither strictly water nor energy limited. By varying top-of-atmosphere insolation (through changes in latitude), total system water content, and initial temperature conditions the sensitivity of the land RCE states is assessed, with particular emphasis on the role of clouds. Based on this analysis, it appears that a necessary condition for the model to exhibit multiple equilibria is the presence of low-level clouds coupled to the diurnal cycle of radiation. In addition the simulated surface precipitation rate varies nonmonotonically with latitude as a result of a tradeoff between in-cloud rain rate and subcloud rain reevaporation, thus underscoring the importance of subcloud layer processes and unsaturated downdrafts. It is shown that clouds, especially at low levels, are key elements of the internal variability of the coupled land-atmosphere system through their feedback on radiation. © 2014 American Meteorological Society. 资助项目: AGS, Division of Atmospheric and Geospace Sciences
; NSF, Division of Atmospheric and Geospace Sciences
; AGS, Division of Atmospheric and Geospace Sciences
; NSF, Division of Atmospheric and Geospace Sciences
; DOE, Division of Atmospheric and Geospace Sciences
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51424
Appears in Collections: 气候变化事实与影响
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作者单位: Columbia University, New York, NY, United States; Rutgers, The State University of New Jersey, New Brunswick, NJ, United States; Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States
Recommended Citation:
Rochetin N.,Lintner B.R.,Findell K.L.,et al. Radiative-convective equilibrium over a land surface[J]. Journal of Climate,2014-01-01,27(23)