Effects of Coordinate Rotation on Turbulent Flux Measurements during Wintertime Haze Pollution in Beijing, China  

作　　者：GUO Xiao-Feng 

机构地区：[1]State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics,Chinese Academy of Sciences

出　　处：《Atmospheric and Oceanic Science Letters》2015年第2期67-71,共5页大气和海洋科学快报（英文版）

基　　金：funded by the National Basic Research Program of China(Grant No.2014CB447900);National High Technology Research and Development Program(Grant No.2014AA06A512);Ministry of Environmental Protection of China through its Special Funds for Scientific Research on Public Welfare(Grant No.201409001)

摘　　要：Eddy-covariance observations from the Beijing 325-m meteorological tower are used to evaluate the effects of coordinate rotation on the turbulent exchange of momentum and scalars during wintertime haze pollution(January-February 2013). Two techniques are used in the present evaluation; namely, the natural wind coordinate(NWC) and the planar fit coordinate(PFC), with the latter being applied by means of two methods for linear regression(i.e., overall and sector-wise). The different techniques show a general agreement in both turbulent fluxes and transport efficiencies, especially evident at the lower, 140-m level above the ground(compared to the higher, 280-m level), perhaps implying that the selection of a technique for coordinate rotation(NWC or PFC) is less of a concern for a sufficiently low level, despite the complexities of urban terrain. Additionally, sector-wise regression is a recommended approach for practical application of the PFC in a complex urban environment subjected to particulate pollution, because this method is found to produce a better correlation between the mean vertical velocity at the 140- and 280-m heights.Eddy-covariance observations from the Bei- jing 325-m meteorological tower are used to evaluate the effects of coordinate rotation on the turbulent exchange of momentum and scalars during wintertime haze pollution （January-February 2013）. Two techniques are used in the present evaluation; namely, the natural wind coordinate （NWC） and the planar fit coordinate （PFC）, with the latter being applied by means of two methods for linear regres- sion （i.e., overall and sector-wise）. The different tech- niques show a general agreement in both turbulent fluxes and transport efficiencies, especially evident at the lower, 140-m level above the ground （compared to the higher, 280-m level）, perhaps implying that the selection of a technique for coordinate rotation （NWC or PFC） is less of a concern for a sufficiently low level, despite the com- plexities of urban terrain. Additionally, sector-wise re- gression is a recommended approach for practical appli- cation of the PFC in a complex urban environment sub- jected to particulate pollution, because this method is found to produce a better correlation between the mean vertical velocity at the 140- and 280-m heights.

关 键 词：coordinate rotation eddy-covariance method particulate air pollution turbulent exchange urban environment 

分 类 号：P412[天文地球—大气科学及气象学] X51[环境科学与工程—环境工程]