河北省中南部对流层CH<sub>4</sub>时空分布特征的飞机探测研究

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Abstract Aiming to characterize the spatial and temporal distribution of tropospheric CH₄ in central and southern Hebei province, CH₄ analyzer and associated auxiliary equipment with high precision were mounted on the King-Air 350 and used to acquire the concentration of CH₄ over central and southern Hebei province (600m~5500m) during June and July in 2018. Seven sets of vertical profiles were obtained by four flights for CH₄ concentration during the observation period, which was the first time in our country. Results showed that the maximum and minimum concentration of CH₄ were 2038×10^-9 and 1884×10^-9, respectively, and the average concentration of CH₄ was (1915±90)×10^-9. The vertical profiles of CH₄ concentration of different flights were in good agreement with the increase of altitude. The CH₄ concentration first increased, then decreased, and after that remained almost constant. A clear dividing line was found under the top of the mixed layer (about 1000m). Concentration of CH₄ at the same level varied greatly blow this line, and the maximum difference between different flights was 124×10^-9. The vertical gradient of CH₄ concentration at the same flight was significantly affected by atmospheric junction. The change of vertical gradient of CH₄ concentration was not obvious when the vertical gradient of potential temperature was near zero. Above 1000m, the CH₄ concentration decreased exponentially with the increase of vertical height. At the same height level, a small change of CH₄ concentration was found as the variation deviation was within 5% of the average value. The CH₄ concentration at the same height level had the smallest amplitude and the difference value was less than 15×10^-9. The CH₄ concentration in the same height layer over Shijiazhuang was larger during the daytime than at night, and the difference grew larger with the decrease of height, indicating that the CH₄ emission source intensity in Shijiazhuang was greater in the day than at night.

Key words： central and southern Hebei troposphere CH₄ concentration spatial and temporal distribution aircraft observation

Received: 15 April 2019

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	YANG Yang
	DONG Xiao-bo
	MAI Rong
	Lü Feng
	WANG Wu-yi
	SUN Xiao-shen
	WANG Xiao-qing
	ZHU Hai-peng

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YANG Yang,DONG Xiao-bo,MAI Rong等. Temporal and spatial distribution of tropospheric CH₄ based on aircraft observation in central and southern Hebei Province[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(11): 4604-4610.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I11/4604

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