复杂地形湍流观测特征及通量代表性分析

北京大学学报（自然科学版）

复杂地形湍流观测特征及通量代表性分析

王雪¹,蔡旭晖¹,康凌²,张宏升³,陈家宜¹

1. 北京大学环境科学与工程学院环境科学系, 北京 100871; 2. 北京大学环境模拟与污染控制国家重点联合实验室, 北京 100871; 3. 北京大学物理学院大气与海洋科学系, 北京 100871;

收稿日期:2009-10-14 出版日期:2010-11-20 发布日期:2010-11-20

Assessment of Turbulence State and Analysis of Flux Footprint over Complex Terrain

WANG Xue¹, CAI Xuhu¹, KANG Ling², ZHANG Hongsheng³, CHEN Jiayi¹

1. Department of Environmental Sciences, College of Environmental Sciences and Engineering, Peking University, Beijing 100871; 2. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871; 3. Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing 100871;

Received:2009-10-14 Online:2010-11-20 Published:2010-11-20

摘要/Abstract

摘要： 利用2006年湖南小墨山地区冬夏两个采样时段的湍流观测数据, 对当地湍流发展混合或扰动情况进行讨论。整体湍流特征量σ_{u, w}/u_*观测值与相似性函数计算值差别较大, 且与来流方向无明显关系, 表明当地湍流受扰动强、发展混合差。结合印痕计算进行的湍流通量观测空间代表性分析发现, 当地观测结果主要代表测点周边山地和平原两种地形的情况。冬季印痕主要分布于北方平原地区, 山地影响平均仅为 21%, 而夏季的印痕源区主要为南方的山地, 约占54%。

关键词: 涡动相关法, 复杂地形, 湍流扰动, 数据质量, 印痕

Abstract: The authors used the observed turbulence data in wintertime and summertime of 2006 in Xiaomo Mountain, Hunan Province to study the state of local turbulence. The difference between the observed σ_{u, w}/u_* and the results calculated from similarity function was large, and there was not clear relationship between σ_{u, w}/u_* with wind directions. It is suggested that the local turbulence was generally not developed completely and was easily disturbed. By using a footprint model, it is found that the flux measurements in Xiaomo Mountain were representative of two types of topography: plain region and hilly region. In winter, the northern plain regions played a major role in the overall footprint sources, and the contribution of hilly area only accounted for 21% . While in summer, the influence of southern hilly area was large, with the contribution of 54% .

Key words: eddy covariance, complex terrain, turbulence disturbance, data quality assessment, footprint

中图分类号:

P404

王雪,蔡旭晖,康凌,张宏升,陈家宜. 复杂地形湍流观测特征及通量代表性分析[J]. 北京大学学报（自然科学版）.

WANG Xue,CAI Xuhu,KANG Ling,ZHANG Hongsheng,CHEN Jiayi. Assessment of Turbulence State and Analysis of Flux Footprint over Complex Terrain[J]. Acta Scientiarum Naturalium Universitatis Pekinensis.

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https://xbna.pku.edu.cn/CN/Y2010/V46/I6/965

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