Impact of 3-D topography on surface radiation budget over the Tibetan Plateau

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Title:	Impact of 3-D topography on surface radiation budget over the Tibetan Plateau
Authors:	Lee, WL (Lee, Wei-Liang) Liou, KN (Liou, K.N.) Wang, CC (Wang, Chia-chi)
Contributors:	Dept Atmospher Sci
Keywords:	GENERAL-CIRCULATION MODEL TERRAIN
Date:	2013-07
Issue Date:	2014-02-25 14:28:37 (UTC+8)
Abstract:	The 3-D complex topography effect on the surface solar radiative budget over the Tibetan Plateau is investigated by means of a parameterization approach on the basis of "exact" 3-D Monte Carlo photon tracing simulations, which use 90 m topography data as building blocks. Using a demonstrative grid size of 10 x 10 km(2), we show that differences in downward surface solar fluxes for a clear sky without aerosols between the 3-D model and the conventional plane-parallel radiative transfer scheme are substantial, on the order of 200 W/m(2) at shaded or sunward slopes. Deviations in the reflected fluxes of the direct solar beam amount to about +100 W/m(2) over snow-covered areas, which would lead to an enhanced snowmelt if the 3-D topography effects had been accounted for in current climate models. We further demonstrate that the entire Tibetan Plateau would receive more solar flux by about 14 W/m(2), if its 3-D mountain structure was included in the calculations, which would result in larger sensible and latent heat transfer from the surface to the atmosphere.
Relation:	THEORETICAL AND APPLIED CLIMATOLOGY Volume: 113 Issue: 1-2 Pages: 95-103
Appears in Collections:	[Department of Atmospheric Sciences & Graduate Institute of Earth Science / Atmospheric Science ] journal articles

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