A generalized layered radiative transfer model in the vegetation canopy

被引:9
作者
Dai, QD [1 ]
Sun, SF [1 ]
机构
[1] Chinese Acad Sci, State Key Lab Numer Modeling Atmospher Sci & Geop, Inst Atmospher Phys, Beijing 100029, Peoples R China
关键词
generalized model of radiation transfer; non-uniform canopy; distributions of leaf angle and radiation angle; optical properties of adaxial and abaxial leaves;
D O I
10.1007/s00376-006-0243-7
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
In this paper, a generalized layered model for radiation transfer in canopy with high vertical resolution is developed. Differing from the two-stream approximate radiation transfer model commonly used in the land surface models, the generalized model takes into account the effect of complicated canopy morphology and inhomogeneous optical properties of leaves on radiation transfer within the canopy. In the model, the total leaf area index (LAI) of the canopy is divided into many layers. At a given layer, the influences of diffuse radiation angle distributions and leaf angle distributions on radiation transfer within the canopy are considered. The derivation of equations serving the model are described in detail, and these can deal with various diffuse radiation transfers in quite broad categories of canopy with quite inhomogeneous vertical structures and uneven leaves with substantially different optical properties of adaxial and abaxial faces of the leaves. The model is used to simulate the radiation transfer for canopies with horizontal leaves to validate the generalized model. Results from the model axe compared with those from the two-stream scheme, and differences between these two models are discussed.
引用
收藏
页码:243 / 257
页数:15
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