基于TanSat的中国大陆CO<sub>2</sub>浓度监测及驱动因子分析

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Abstract Based on XCO₂, the column-averaged dry-air mole fraction of CO₂, observed by TanSat from March 2017 to March 2018, the accuracy and reliability of this dataset were comprehensively verified and validated against NASA's OCO-2 satellite observations and CT and TCCON ground measurements in China's mainland. XCO₂ characteristics in five main regions were analyzed, and driving effects of natural and socioeconomic factors on atmospheric CO₂ concentration were investigated by using Pearson correlation analysis and Geodetector method. The results demonstrate a good consistency between TanSat and OCO-2 observations only with a minor difference between (-3~3)×10^-6. In general, XCO₂ concentration fluctuates regularly with seasons. In summer obvious regional distinctions were detected. XCO₂ concentration in south China was at a higher level and greater than 403×10^-6 due to intense human influence. Compared with other regions, in north China, a lower average XCO₂ concentration (<401×10^-6) was observed due to intense vegetation photosynthesis herein. Whereas XCO₂ trend in west China was relatively flat. NDVI is the major natural factor affecting XCO₂ concentration and presents a significant linear negative correlation with TanSat observations (r=-0.658, P<0.05). While fossil fuel burning had the strongest explanatory power for XCO₂ spatial heterogeneity, and its interaction with various natural factors had much greater effect than each single factor. However, interaction between fossil fuel burning and rainfall would be the most influential one with a q value of 0.495.

Key words： TanSat accuracy verification correlation analysis geodetector concentration monitoring driving factor analysis

Received: 28 March 2023

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X511

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	LI Kai-xuan
	YANG Li-ping
	ZHANG Jing
	REN Jie
	WANG Yu

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LI Kai-xuan,YANG Li-ping,ZHANG Jing等. Monitoring and driving factors analysis of CO₂ concentration in China's mainland based on TanSat[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(11): 5645-5654.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I11/5645

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