贾立,王介民,MassimoMenenti. 1999. 绿洲-沙漠复合地表条件下的局地和有效粗糙度[J]. 气象学报, 57(3):346-357, doi:10.11676/qxxb1999.033
绿洲-沙漠复合地表条件下的局地和有效粗糙度
THE LOCAL AND EFFECTIVE AERODYNAMIC ROUGHNESS LENGTH OF A COMPLEX LANDSCAPE OF OASIS AND DESERT
投稿时间:1997-08-22  修订日期:1998-06-11
DOI:10.11676/qxxb1999.033
中文关键词:  空气动力学粗糙度  有效值  局地值  粗糙元  应力分解
英文关键词:Local aerodynamic roughness length  Effective aerodynamic roughness length  Rough elements  Drag partition
基金项目:国家自然科学基金(49475244,49790020)
作者单位
贾立 中国科学院兰州高原大气物理研究所, 兰州, 730000 
王介民 中国科学院兰州高原大气物理研究所, 兰州, 730000 
MassimoMenenti DLO-Winand Staring Centre, The Wageningen 6700AC, Netherlands 
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中文摘要:
      地表空气动力学粗糙度是研究水平非均匀条件下陆面过程的基础,文中对黑河试验区各不同下垫面上地表空气动力学粗糙度进行了估算和分析,分别得到了地表空气动力学粗糙度z0m的有效值和局地值,发现各不同典型下垫面的局地z0m值明显不同,尤其在有作物存在时,绿洲的局地z0m值比沙漠、戈壁的值明显要大;而对同一测站,有效空气动力学粗糙度比局地空气动力学粗糙度值明显要大,运用应力分解理论对这种差异进行了解释,认为有效空气动力学粗糙度与复合表面的总应力有关,其代表了较大水平尺度内的表面和较高障碍物的综合作用,当涉及对陆表通量参数化问题时,必须首先确定水平尺度及相应的地表粗糙度参数。
英文摘要:
      Aerodynamic roughness length z0m is the basic parameter in research for land surface processes. In this paper, the values of aerodynamic roughness length z0m were estimated with different surface types in experiment field of Heihe river basin. It could be found that the values of z0m were rather different between different surfaces, ones in oasis were larger than in desert, especially during canopy growing. With measurements at different height, local and effective roughness length were obtained at same site. Effective roughness length were realistically larger than local ones due to the relationship between the horizontal extent of landscape elements and aerodynamic roughness parameters of total stress at increasing heights. It could be drawn that the horizontal scale thereby aerodynamic roughness length related to had to be determined when one concerned to the research on the parameterization on land surface processes.
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