DOI: 10.1002/jgrd.50416
论文题名: Diagnosing evaporative fraction over land from boundary-layer clouds
作者: Gentine P. ; Ferguson C.R. ; Holtslag A.A.M.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 15 起始页码: 8185
结束页码: 8196
语种: 英语
英文关键词: Boundary layer
; Bowen Ratio
; Data Assimilation
; Evaporative Fraction
; Shallow Cumulus
; Surface Energy Budget
Scopus关键词: Boundary layers
; Interfacial energy
; Bowen ratio
; Data assimilation
; Evaporative fraction
; Shallow cumulus
; Surface energy budget
; Clouds
; Bowen ratio
; convective boundary layer
; convective cloud
; cumulus
; data assimilation
; energy budget
; evaporation
; fractionation
; surface energy
; troposphere
; Great Plains
; Netherlands
; West Africa
英文摘要: The potential use of continental fair-weather shallow cumuli as a way to retrieve the daily surface evaporative fraction over land is evaluated in convective conditions. The proposed method utilizes the fact that both the timing of cloud occurrence and the cloud-base height at the time of occurrence provide strong constraints on the surface energy balance and evaporative fraction. The retrieval is especially reliable in the presence of relatively stable and humid-free troposphere profiles. The advantage of the method is that it provides a more direct estimate of the surface evaporative fraction than indirect estimation based on inversion of a highly parameterized land-surface model. In addition, the evaporative fraction is obtained at a scale of a few kilometers, which is more pertinent for weather and climate studies. The retrieval strategy is tested and validated for three contrasting climates: the U.S. southern Great Plains, West Africa, and the Netherlands. We suggest that the use of satellite observations of shallow cumuli can help constrain the retrieval of the surface evaporative fraction within a data assimilation scheme/reanalysis. Key Points Onset of cumulus provides indicator of evaporative fraction. Cumulus are direct observables of surface energy partitioning Strategy requires less parameterization than inversion of land surface model. ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63434
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Earth and Environmental Engineering, Columbia University, New York NY 10027, United States; Department of Hydrology and Water Resources Engineering, Institute of Industrial Science, University of Tokyo, Tokyo, Japan; Meteorology and Air Quality Section, Wageningen University, Wageningen, Netherlands
Recommended Citation:
Gentine P.,Ferguson C.R.,Holtslag A.A.M.. Diagnosing evaporative fraction over land from boundary-layer clouds[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(15)