象山湾大气中CH<sub>4</sub>和CO<sub>2</sub>时空分布及其同位素组成特征

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Abstract Understanding the greenhouse gas emissions in the global Gulf region is of great significance for coping with global warming. Therefore, the Xiangshan Bay, a typical gulf, was selected to reveal the impact of coastal zone on global climate change, through analyzing the concentration changes of CH₄ and CO₂ and their relationship with meteorological elements in the bay. The data showed that the CH₄ concentrations in Xiangshan Bay area ranged from 1.72×10^-6to 2.17×10^-6, with an average concentration of 1.82×10^-6. The δ¹³C_CH₄ values range from -60.69‰ to -41.10‰, with an average value of -50.261‰. The concentrations of CO₂ range from 410.3×10^-6 to 640.883×10^-6, with an average concentration of 433.294×10^-6. The δ¹³C_CO₂ values range from -16.79‰ to -2.33‰, with an average value of -6.83‰. On the whole, the content of CH₄ in the bay was greater than that outside the bay, and gradually decreased from land to sea, indicating that the near shallow sea area was the source of atmospheric methane. The overall trend of CO₂ content variation in the bay was low, which indicates that it is the sink of CO₂. Combined with land use types, the changes of CH₄ and CO₂ concentrations were greatly affected by anthropic factors, and greenhouse gases were significantly higher in building land, forest land and cultivated land. In contrast, the concentrations of greenhouse gases were lower in the plain and aquaculture areas. At the same time, the diurnal variation of CH₄ and CO₂ concentrations was basically the same, showing a tendency of greater during daytime than that of at night, and the isotopic composition was negatively correlated with their concentrations. In terms of time distribution, the concentration of CH₄ and CO₂ is significantly affected by temperature, humidity, wind speed, tidal action, the strength of large air source and sink, and the pressure difference at the water-air interface.

Key words： Xiangshan Bay methane carbon dioxide concentration isotope

Received: 07 March 2023

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	LI Xue
	DUAN Xiao-yong
	YIN Ping
	GAO Fei
	CAO Ke
	TIAN Yuan
	LI Mei-na
	LIU Xiao-feng
	Lü Sheng-hua

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LI Xue,DUAN Xiao-yong,YIN Ping等. Spatial and temporal variation and isotopic composition of CH₄ and CO₂ in Xiangshan Bay[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(10): 5062-5069.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I10/5062

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