DOI: 10.1175/JCLI-D-11-00561.1
Scopus记录号: 2-s2.0-84876089470
论文题名: An idealized prototype for large-scale land-atmosphere coupling
作者: Lintner B.R. ; Gentine P. ; Findell K.L. ; D'Andrea F. ; Sobel A.H. ; Salvucci G.D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 7 起始页码: 2379
结束页码: 2389
语种: 英语
Scopus关键词: Atmospheric columns
; Convective adjustments
; Land-atmosphere couplings
; Moisture advection
; Moisture conditions
; Moisture convergence
; Quantitative comparison
; Sensitivity measures
; Lasers
; Water supply
; Soil moisture
; air-soil interaction
; atmospheric convection
; evaporation
; moisture transfer
; precipitation (climatology)
; soil moisture
英文摘要: A process-based, semianalytic prototype model for understanding large-scale land-atmosphere coupling is developed here. The metric for quantifying the coupling is the sensitivity of precipitation P to soil moisture W, ΔP/ΔW. For a range of prototype parameters typical of conditions found over tropical or summertime continents, the sensitivity measure exhibits a broad minimum at intermediate soil moisture values. This minimum is attributed to a trade-off between evaporation (or evapotranspiration) E and large-scale moisture convergence across the range of soil moisture states. For water-limited, low soil moisture conditions, ΔP/ΔW is dominated by evaporative sensitivity ΔE/ΔW, reflecting high potential evaporation Ep arising from relatively warm surface conditions and a moisture-deficient atmospheric column under dry surface conditions. By contrast, under high soil moisture (or energy limited) conditions, ΔE/ΔW becomes slightly negative as Ep decreases. However, because convergence and precipitation increase strongly with decreasing (drying) moisture advection, while soil moisture slowly saturates, ΔP/ΔW is large. Variation of key parameters is shown to impact the magnitude of ΔP/ΔW, for example, increasing the time scale for deep convective adjustment lowers ΔP/ΔW at a givenW, especially on the moist side of the profile where convergence dominates. While the prototype's applicability for direct quantitative comparison with either observations or models is clearly limited, it nonetheless demonstrates how the complex interplay of surface turbulent and column radiative fluxes, deep convection, and horizontal and vertical moisture transport influences the coupling of the land surface and atmosphere that may be expected to occur in either more realistic models or observations. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51972
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Environmental Sciences, Rutgers, The State University of New Jersey, New Brunswick, NJ, United States; Department of Earth and Environmental Engineering, Columbia University, New York, NY, United States; Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States; Laboratoire de Météorologie Dynamique, École Normale Supéerieure, Paris, France; Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, United States; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Department of Earth and Environment, Boston University, Boston, MA, United States
Recommended Citation:
Lintner B.R.,Gentine P.,Findell K.L.,et al. An idealized prototype for large-scale land-atmosphere coupling[J]. Journal of Climate,2013-01-01,26(7)