刘树华,黄子琛,刘立超. 1996. 半干旱区植被覆盖度对边界层气候热力影响的数值模拟[J]. 气象学报, 54(3):303-311, doi:10.11676/qxxb1996.031
半干旱区植被覆盖度对边界层气候热力影响的数值模拟
NUMERICAL SIMULATION OF THE INFLUENCE OF VEGETATION COVER ON BOUNDARY LAYER CLIMATE IN SEMIARID REGION
投稿时间:1994-03-10  修订日期:1995-05-08
DOI:10.11676/qxxb1996.031
中文关键词:  植被覆盖度  边界层气候  数值模拟
英文关键词:Vegetation cover factor  Boundary layer climate  Numerical simulation
基金项目:
作者单位
刘树华 北京大学地球物理系, 北京, 100871 
黄子琛 中国科学院兰州沙漠研究所, 兰州, 730000 
刘立超 中国科学院兰州沙漠研究所, 兰州, 730000 
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中文摘要:
      在陆-气相互作用的中小尺度系统研究中,水平非均匀下垫面的强迫作用是主要的物理过程。本文利用能量闭合二维陆面过程与大气边界层耦合模式,研究了我国西北半干旱地区(38°N,105°E)夏季下垫面物理特征的变化对区域边界层气候的影响。结果表明:土壤湿度、植被覆盖度对局地环流和区域边界层气候的形成起着决定性的作用。模拟结果揭示了在半干旱地区大面积植树造林、提高植被覆盖度,可涵养土壤水分,改善局地生态环境,是人工持续改造干旱、半干旱荒漠地区局地气候的重要途径。
英文摘要:
      A two-dimensional mesoscale land surface process and atmospheric boundary layer coupled model including a detailed representation of the planetary boundary layer,the soil and the vegetation were presented for studying the influence of the variation of vegetation cover on the soil physical properties and boundary layer climate in the semiarid region of North West China (around 38°N,105°E).Through heat balance equations the soil surface and vegetation surface were merged in a coupled system,in which vegetation was considered as a horizontally uniform layer,soil was divided into 13 layers and the horizontal differences of vegetation cover is a decisive factor to boundary layer climate. It can be used to forecast the radiation,heat and water fluxes in atmosphere.
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