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Vertical variations of CO2/CH4 in winter based on observations at high-rise buildings in Shanghai |
CHEN Long-long1, XIAO Wei1, YANG Fan2, SHAN Meng3, WANG Jun1, HU Ning1, LI Ruo-nan1, CHENG Kai1 |
1. Yale-NUIST Center on Atmospheric Environment, Key Laboratory of Ecosystem Carbon Source and Sink of China Meteorological Administration, Nanjing University of Information Science & Technology, Nanjing 210044, China; 2. Environmental Monitoring Station of Pudong New District, Shanghai 200135, China; 3. Zhejiang Lin'an Atmospheric Background National Observation and Research Station, Hangzhou 311307, China |
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Abstract In this paper, three portable greenhouse gas analyzers were used to continuously observe the atmospheric CO2 and CH4 concentrations at the heights of 255 and 500m at Shanghai Tower and 25m at Pudong New Area Environmental Monitoring Station from 6 December 2021 to 31 March 2022. The results indicated that: (1) the diurnal variabilities of the greenhouse gases at different heights in the city were different, with low value in daytime and high value at night for the 25m height, but opposite for the 255 and 500m heights. The CO2 and CH4 concentrations at each height were affected obviously by atmospheric boundary layer height, suggesting that vertical observation in cities must consider the variability of atmospheric boundary layer. (2) The vertical difference of the CO2 and CH4 concentrations were affected by anthropogenic activities and meteorological conditions, which can trace local and regional contributions. (3) The CO2 and CH4 concentrations were significantly correlated at each height (25, 255, 500m), and the correlation was weaker at greater height due to the interference of more emission and weak homology. The vertical observation of urban greenhouse gas concentration provided unique information that cannot be obtained from the horizontal observation. Therefore, three-dimensional greenhouse gas monitoring in cities was required to capture the change of atmospheric greenhouse gas concentration and to serve the urban carbon emission reduction policy.
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Received: 18 January 2024
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Corresponding Authors:
肖薇,教授,wei.xiao@nuist.edu.cn;杨帆,高级工程师,wukong6106@163.com
E-mail: wei.xiao@nuist.edu.cn;wukong6106@163.com
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