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

doi:10.13209/j.0479-8023.2022.021

Acta Scientiarum Naturalium Universitatis Pekinensis ›› 2022, Vol. 58 ›› Issue (3): 434-442.DOI: 10.13209/j.0479-8023.2022.021

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

GE Hongxing^1,2,†, WEI Zhuorui³, ZHANG Hongsheng³, KANG Ling⁴

1. Nanjing Research Institute of Electronics Technology, Nanjing 210039 2. Key Laboratory of IntelliSense Technology, China Electronics Technology Group Corporation, Nanjing 210039 3. Laboratory for Climate and Oceanic-Atmosphere Studies, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing 100871 4. State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871

Received:2021-04-23 Revised:2021-05-31 Online:2022-05-20 Published:2022-05-20
Contact: GE Hongxing, E-mail: ge_star(at)163.com

松弛涡旋累积法获取甲烷湍流通量的实验研究

葛红星^1,2,†, 卫茁睿³, 张宏升³, 康凌⁴

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

通讯作者: 葛红星, E-mail: ge_star(at)163.com
基金资助:
国家自然科学基金(92044301, 91837209, 41544216)和新疆维吾尔自治区高层次(柔性)人才引进项目(2018)资助

Abstract

Abstract:

Based on the data collected at the Atmospheric Turbulence and Atmospheric Environment Experimental 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 H_REA. The minimum dispersion of b for each scalar was reached with H_REA=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.

Key words: relaxed eddy accumulation method, methane, turbulent flux, proxy scalar

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, H_REA=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CH₄湍流通量。

关键词: 松弛涡旋累积法, 甲烷, 湍流通量, 代理变量

GE Hongxing, WEI Zhuorui, ZHANG Hongsheng, KANG Ling. Experimental Research of Methane Flux Measurement by the Relaxed Eddy Accumulation Method[J]. Acta Scientiarum Naturalium Universitatis Pekinensis, 2022, 58(3): 434-442.

葛红星, 卫茁睿, 张宏升, 康凌. 松弛涡旋累积法获取甲烷湍流通量的实验研究[J]. 北京大学学报自然科学版, 2022, 58(3): 434-442.

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URL: https://xbna.pku.edu.cn/EN/10.13209/j.0479-8023.2022.021

https://xbna.pku.edu.cn/EN/Y2022/V58/I3/434

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

松弛涡旋累积法获取甲烷湍流通量的实验研究

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