象山湾大气中CH4和CO2时空分布及其同位素组成特征

李雪; 段晓勇; 印萍; 高飞; 曹珂; 田元; 李梅娜; 刘晓凤; 吕胜华

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中国环境科学 ›› 2023, Vol. 43 ›› Issue (10) : 5062-5069.

大气污染与控制

象山湾大气中CH₄和CO₂时空分布及其同位素组成特征

李雪^1,2,3, 段晓勇^1,3, 印萍^1,3, 高飞^1,3, 曹珂^1,3, 田元^1,3, 李梅娜^1,3, 刘晓凤⁴, 吕胜华^1,3

作者信息 +

Spatial and temporal variation and isotopic composition of CH₄ and CO₂ in Xiangshan Bay

LI Xue^1,2,3, DUAN Xiao-yong^1,3, YIN Ping^1,3, GAO Fei^1,3, CAO Ke^1,3, TIAN Yuan^1,3, LI Mei-na^1,3, LIU Xiao-feng⁴, Lü Sheng-hua^1,3

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摘要

海湾区域的温室气体排放对于全球变暖具有重要影响，因此本研究选取中国东部典型海湾-象山湾作为研究对象，通过对CH₄和CO₂的浓度与同位素的时空变化特征分析来揭示海岸带对全球气候变化的影响.象山湾海域低层大气中CH₄浓度变化范围为（1.72~2.17）×10^-6，平均浓度为1.82×10^-6；δ¹³C_CH₄的变化范围为-60.69‰~-41.10‰，平均值为-50.261‰；CO₂浓度变化范围为（410.3~640.3）×10^-6，平均浓度为433.294×10^-6；δ¹³C_CO₂的变化范围为-16.79‰~-2.33‰，平均值为-6.83‰.CH₄含量整体上呈湾内大于湾外、从陆地向海方向逐渐减少的趋势，表明近浅海区域是大气甲烷的源；而CO₂含量变化湾内整体呈现偏低的趋势，证明是CO₂的汇.CH₄和CO₂的浓度变化受人为因素影响较大，建筑用地和林地、耕地区域温室气体明显偏高；相反，光滩和水产养殖区域温室气体的浓度较低.同时CH₄和CO₂的浓度昼夜变化基本一致，均呈现夜间大于白天的趋势，且同位素组成与其浓度呈负相关.CH₄和CO₂的浓度昼夜变化受温度、潮汐作用、大气源汇强度等影响显著.

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.

导出引用

李雪, 段晓勇, 印萍, 高飞, 曹珂, 田元, 李梅娜, 刘晓凤, 吕胜华. 象山湾大气中CH₄和CO₂时空分布及其同位素组成特征[J]. 中国环境科学. 2023, 43(10): 5062-5069

LI Xue, DUAN Xiao-yong, YIN Ping, GAO Fei, CAO Ke, TIAN Yuan, LI Mei-na, LIU Xiao-feng, Lü Sheng-hua. Spatial and temporal variation and isotopic composition of CH₄ and CO₂ in Xiangshan Bay[J]. China Environmental Science. 2023, 43(10): 5062-5069

中图分类号： X51

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