干旱气象

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西北地区典型下垫面空气动力学阻抗估算方法改进及其验证

王丽娟1左洪超2杨启东3   

  1. 1. 中国气象局兰州干旱气象研究所,甘肃省干旱气候变化与减灾重点实验室,中国气象局干旱气候变化与减灾重点开放实验室,甘肃 兰州 730020;
    2. 兰州大学大气科学学院,甘肃 兰州 730000;
    3. 云南大学大气科学系,云南 昆明 650091
  • 出版日期:2013-12-14 发布日期:2013-12-14
  • 作者简介:王丽娟(1986 - ),女,四川广安人,硕士,助理工程师,主要从事陆面及卫星遥感研究. E - mail:wanglijuan01@126. com
  • 基金资助:

    兰州干旱气象研究所硕士科研启动项目(KYS2012SS03) 和中国科学院寒旱区陆面过程与气候变化重点实验室开放基金(LPCC201207)共同资助

Improvement and Validation of Aerodynamic Resistance About the Typical Underlying Surface in Northwest of China

WANG Lijuan1ZUO Hongchao2YANG Qidong3   

  1. 1. Key Laboratory of Arid Climatic Change and Reducing Disater of Gansu Province/Key Open Laboratory of Arid Climatic Change and Disaster Reduction of CMA/Institute of Arid Meteorology,CMA,Lanzhou 730020,China;
    2. College of Atmospheric Sciences,Lanzhou University,Lanzhou 730000,China;
    3. Department of Atmospheric Sciences,Yunnan University,Kunming 650091,China
  • Online:2013-12-14 Published:2013-12-14

摘要:

利用 2010 年古浪近地层野外观测试验取得的干旱区典型下垫面(荒滩、沙漠和农田)的观测资料,对常用的 3 种空气动力学阻抗算法———Verma - R 算法、Liu 算法、Thom 算法进行了适用性检验,并通过分离 Thom 算法中的动量和热量粗糙度对其进行改进(下称 Thom -2 算法)。对比不同下垫面空气动力学阻抗估算结果发现:在沙漠和荒滩下垫面,动力因素较热力因素影响大,空气动力学阻抗与风速的指数关系较农田下垫面明显;与其他 3 种算法相比,考虑了热量粗糙度的 Thom -2 算法在各种典型下垫面上的估算结果与观测值相比偏差最小,且在较为均匀的荒滩和沙漠下垫面上估算的空气动力学阻抗精度较农田高;通过比较 4 种算法估算干旱区不同典型下垫面空气动力学阻抗结果,说明干旱区空气动力学阻抗的估算应考虑热力粗糙度的影响。

关键词: 空气动力学阻抗, 古浪非均匀近地层野外观测试验, 风速, 非均匀下垫面

Abstract:

Based on the observed data of typical underlying surface (named as wasteland,desert and cropland,respectively) of the Gu-lang Heterogeneous Underlying Surface Layer Experiment (GHUSLE) in 2010,the applicability of three aerodynamic resistance algo-rithms (Verma - Ralgorithm,Liu algorithm and Thom algorithm,respectively) that used commonly was verified,and a modified algo-rithm was developed (named as Thom -2 algorithm in this paper),in which the momentum and heat roughness were separated by fur-ther thinking about the influence of the heat and momentum roughness in the Thom algorithm. Compared the estimated aerodynamic re-sistance of the different underlying surfaces by using the four algorithms,the dynamic factor was more important on wasteland and des-ert than thermodynamic factor about influence of aerodynamic resistance,and the exponentially relationship between aerodynamic resist-ance and wind speed was obviously better on wasteland and desert than that of cropland underlying surface. Compared with the observed data,the modified algorithm was the best one among the four algorithms for aerodynamic resistance estimating on the all typical underly-ing surfaces,and the result of modified algorithm had higher accuracy on the wasteland and desert underlying surfaces where were more uniform than that of cropland underlying surfaces. By comparing the result of the four algorithms on the three typical underlying sur-faces,the influence of heat roughness should be considered for the aerodynamic resistance estimating in arid areas.

Key words:  aerodynamic resistance, GHUSLE, wind speed, heterogeneous underlying surface

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