松弛涡旋累积法获取甲烷湍流通量的实验研究  

Experimental Research of Methane Flux Measurement by the Relaxed Eddy Accumulation Method

作　　者：葛红星 卫茁睿 张宏升[3] 康凌[4] GE Hongxing;WEI Zhuorui;ZHANG Hongsheng;KANG Ling(Nanjing Research Institute of Electronics Technology,Nanjing 210039;Key Laboratory of IntelliSense Technology,China Electronics Technology Group Corporation,Nanjing 210039;Laboratory for Climate and Oceanic-Atmosphere Studies,Department of Atmospheric and Oceanic Sciences,School of Physics,Peking University,Beijing 100871;State Key Joint Laboratory of Environmental Simulation and Pollution Control,College of Environmental Sciences and Engineering,Peking University,Beijing 100871)

机构地区：[1]南京电子技术研究所,南京210039 [2]中国电子科技集团公司智能感知技术重点实验室,南京210039 [3]北京大学物理学院大气与海洋科学系气候与海‒气实验室,北京100871 [4]环境模拟与污染控制国家重点联合实验室,北京大学环境科学与工程学院,北京100871

出　　处：《北京大学学报（自然科学版）》2022年第3期434-442,共9页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：国家自然科学基金(92044301,91837209,41544216);新疆维吾尔自治区高层次(柔性)人才引进项目(2018)资助。

摘　　要：基于2015年11月至2016年11月华东地区农田下垫面大气湍流和大气环境观测实验资料,采用松弛涡旋累积法(REA)获取农田下垫面甲烷(CH4)湍流通量,并与涡动相关法(EC)获取的甲烷通量进行对比验证。观测期内,REA法获取的温度、水汽、二氧化碳和甲烷湍流通量的经验系数分别为0.59,0.59,0.59和0.58。经验系数b的中位数随归一化采样阈值H_(REA)的增大而减小,HREA=0.8时各物理量的b值离散性最小。以温度T作为代理变量,用REA法获取的CH4湍流通量与EC法的结果具有较好的一致性,说明REA法适用于获取CH_(4)湍流通量。Based on the data collected at the Atmospheric Turbulence and Atmospheric Environment Experimen-tal Station in east China from November 2015 to November 2016,the methane flux over farmland was estimated using the relaxed eddy accumulation(REA)method.During the experiment,the empirical coefficients b of various scalars including temperature,water vapor,carbon dioxide and methane for the REA method were 0.59,0.59,0.59 and 0.58,respectively.The median of b decreased with the increase of the normalized sampling threshold HREA.The minimum dispersion of b for each scalar was reached with HREA=0.8.The methane flux obtained by the REA method with T as the proxy scalar was highly consistent with the flux obtained by the EC method,showing that the REA method was suitable for measuring methane flux.

关 键 词：松弛涡旋累积法 甲烷 湍流通量 代理变量 

分 类 号：P425.2[天文地球—大气科学及气象学]