Averaging period effects on the turbulent flux and transport efficiency during haze pollution in Beijing, China

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• 作者：Xiaofeng Guo ; Ting Yang ; Yele Sun
• 刊名：Meteorology and Atmospheric Physics
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：127
• 期：4
• 页码：419-433
• 全文大小：2,055 KB
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• 作者单位：Xiaofeng Guo (1)
  Ting Yang (1)
  Yele Sun (1)
  
  1. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100083, People’s Republic of China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Meteorology and Climatology
  Atmospheric Protection, Air Quality Control and Air Pollution
  Climate Change
  Mathematical Applications in Environmental Science
  Terrestrial Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  
• 出版者：Springer Wien
• ISSN：1436-5065

文摘

Based on observations at the heights of 140 and 280?m on the Beijing 325-m meteorological tower, this study presents an assessment of the averaging period effects on eddy-covariance measurements of the momentum/scalar flux and transport efficiency during wintertime haze pollution. The study period, namely from January 6 to February 28 2013, is divided into different episodes of particulate pollution, as featured by varied amounts of the turbulent exchange and conditions of the atmospheric stability. Overall, turbulent fluxes of the momentum and scalars (heat, water vapor, and CO2) increase with the averaging period, namely from 5, 15, and 30 up to 60?min, an outcome most evident during the ‘transient-episodes (each lasting for 2-?days, i.e., preceded and followed by clean-air days with mean concentrations of PM1 less than 40?μg?m?). The conventional choice of 30?min is deemed to be appropriate for calculating the momentum flux and its transport efficiency. By comparison, scalar fluxes and their transport efficiencies appear more sensitive to the choice of an averaging period, particularly at the upper level (i.e., 280?m). It is presupposed that, for urban environments, calculating the momentum and scalar fluxes could invoke separate averaging periods, rather than relying on a single prescription (e.g., 30?min). Furthermore, certain characteristics of urban turbulence are found less sensitive to the choice of an averaging period, such as the relationship between the heat-to-momentum transport efficiency and the local stability parameter.