刘和平,桑建国,刘树华. 1999. 森林冠层边界层湍流传输的观测和数值模拟[J]. 气象学报, 57(6):715-728, doi:10.11676/qxxb1999.069
森林冠层边界层湍流传输的观测和数值模拟
OBSERVING AND NUMERICAL MODELLING OF DISPERSIVE TRANSFER IN FOREST CANOPY BOUNDARY LAYER
投稿时间:1997-08-28  修订日期:1998-07-06
DOI:10.11676/qxxb1999.069
中文关键词:  森林冠层  动量、热量和水汽传输  非局地湍流扩散  数值模拟
英文关键词:Canopy  Momentum  heat and water vapor transfer  Nonlocal dispersive Flux  Numerical model
基金项目:国家自然科学基金,49575251
作者单位
刘和平 北京大学地球物理系, 北京 100871 
桑建国 北京大学地球物理系, 北京 100871 
刘树华 北京大学地球物理系, 北京 100871 
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中文摘要:
      文中分析和模拟了森林冠层上下动量、热量和水汽传输的特征。结果表明:冠层对动量的吸收十分明显,非局地扩散通量在冠层上下的动量传输中起着很大的作用;白天在冠层下层结稳定,但冠层下观测的感热通量向上传输;夜晚冠层下层结不稳定,但冠层下观测的感热通量向下传输,白天和晚上都出现了热量的反梯度传输现象,从而证明在热量输送中,非局地扩散通量不可忽视。同时对冠层上下的水汽交换特征的分析表明:非局地扩散通量是冠层内水汽向冠层上传输的主要机制。
英文摘要:
      A micrometeorological model was developed to simulate momentum,heat and water vapor transfer within and above forests.Simple Biosphere Model (SiB) was also used for providing such parameters as the evapotranspiration rate of the vegetations.In processing dispersive transport term in momentum equation.first order closure scheme by Li (1985) was used after modification according to analysis of physical processes.After that,the modified method was also used for calculating various dispersive terms which appeared in the other equations.The vegetation canopy was devided into several layers according to the leaf area density.The evapotranspiration rate of vegetation and its latent heat were considered in water vapor conservative equation and heat equation respectively.Absorbed net radiations by different layers were different within the canopy because of various leaf area density.
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