DOI: 10.1175/JCLI-D-14-00255.1
Scopus记录号: 2-s2.0-84907584686
论文题名: An analytical model for tropical relative humidity
作者: Romps D.M.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 19 起始页码: 7432
结束页码: 7449
语种: 英语
Scopus关键词: Convective-scale process
; Atmospheric humidity
; air temperature
; analytical method
; climate modeling
; global climate
; precipitation (climatology)
; relative humidity
; water vapor
英文摘要: An analytical model is derived for tropical relative humidity using only the Clausius-Clapeyron relation, hydrostatic balance, and a bulk-plume water budget. This theory is constructed for radiative-convective equilibriumand compared against a cloud-resolving model. With some reinterpretation of variables, it can be applied more generally to the entire tropics. Given four variables-pressure, temperature, and the fractional entrainment and detrainment rates-the equations predict the relative humidity (RH) andthe temperature lapse rate analytically.TheRHis a simple ratio involving the fractional detrainment rate and the water-vapor lapse rate. When integrated upward in height, the equations give profiles of RH and temperature for a convecting atmosphere. The theory explains the magnitude of RH and the "C" shape of the tropospheric RH profile. It also predicts that RH is an invariant function of temperature as the atmosphere warms, and this behavior matches what has been seen in global climate models and what is demonstrated here with cloud-resolving simulations. Extending the theory to include the evaporation of hydrometeors, a lower bound is derived for the precipitation efficiency (PE) at each height: PE > 1 - RH. In a cloud-resolving simulation, this constraint is obeyed with the PE profile taking the shape of an inverted C shape. © 2014 American Meteorological Society. 资助项目: NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51444
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth and Planetary Science, University of California, Berkeley, CA, United States; Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States
Recommended Citation:
Romps D.M.. An analytical model for tropical relative humidity[J]. Journal of Climate,2014-01-01,27(19)