DOI: 10.1002/jgrd.50819
论文题名: On the relationship between cloud contact time and precipitation susceptibility to aerosol
作者: Feingold G. ; McComiskey A. ; Rosenfeld D. ; Sorooshian A.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 18 起始页码: 10544
结束页码: 10554
语种: 英语
英文关键词: aerosol
; clouds
; precipitation
; susceptibility
Scopus关键词: Aerosols
; C (programming language)
; Clouds
; Large eddy simulation
; Liquids
; Magnetic susceptibility
; Precipitation (chemical)
; Autoconversion
; Dependent process
; Drop concentrations
; Liquid water paths
; Model framework
; Non-monotonic function
; Primary response
; Qualitative behavior
; Rain
; aerosol
; climate modeling
; cloud
; coalescence
; large eddy simulation
; parameterization
; precipitation (climatology)
; qualitative analysis
; rainfall
; trajectory
英文摘要: The extent to which the rain rate from shallow, liquid-phase clouds is microphysically influenced by aerosol, and therefore drop concentration N d perturbations, is addressed through analysis of the precipitation susceptibility, So . Previously published work, based on both models and observations, disagrees on the qualitative behavior of So with respect to variables such as liquid water path L or the ratio between accretion and autoconversion rates. Two primary responses have emerged: (i) So decreases monotonically with increasing L and (ii) So increases with L, reaches a maximum, and decreases thereafter. Here we use a variety of modeling frameworks ranging from box models of (size-resolved) collision-coalescence, to trajectory ensembles based on large eddy simulation to explore the role of time available for collision-coalescence tc in determining the So response. The analysis shows that an increase in tc shifts the balance of rain production from autoconversion (a Nd -dependent process) to accretion (roughly independent of N d ), all else (e.g., L) equal. Thus, with increasing cloud contact time, warm rain production becomes progressively less sensitive to aerosol, all else equal. When the time available for collision-coalescence is a limiting factor, So increases with increasing L whereas when there is ample time available, So decreases with increasing L. The analysis therefore explains the differences between extant studies in terms of an important precipitation-controlling parameter, namely the integrated liquid water history over the course of an air parcel's contact with a cloud. Key PointsTime-integrated liquid water determines precipitation susceptibility to aerosolRain susceptibility to aerosol is a non-monotonic function of liquid water ©2013. American Geophysical Union. All Rights Reserved. 资助项目: N00014-10-1-0811
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63311
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: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, CO 80305, United States; Cooperative Institute for Research in Environmental Sciences, NOAA Earth System Research Laboratory, Boulder, CO, United States; Institute of Earth Science, Hebrew University, Jerusalem, Israel; Department of Chemical and Environmental Engineering, University of Arizona, Tucson, AZ, United States; Department of Atmospheric Sciences, University of Arizona, Tucson, AZ, United States
Recommended Citation:
Feingold G.,McComiskey A.,Rosenfeld D.,et al. On the relationship between cloud contact time and precipitation susceptibility to aerosol[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(18)