五台山大气CO<sub>2</sub>本底浓度及源汇特征

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Abstract Based on the continuous CO₂ datasets from 2017 to 2020, observed at Wutaishan GHG station, the background concentration and source-sink characteristics of CO₂ in Wutai Mountain were studied by using the Moving Average Filtering (MAF) method and backward trajectory analysis. The results show that the atmospheric CO₂ concentrations were affected by regional or local sources/sinks, with the smaller hourly amplitude of background concentration (44.9×10^-6), compared to that of unselected CO₂ concentration (94.7×10^-6). The CO₂ background concentration had slowly increased from 2017 to 2020. Particularly, the proportion of rising concentration had decreased probably due to the weakened human activities. On the contrast, the variation in the absorption concentration was stable, inferring that the effect of terrestrial ecosystem on CO₂ concentration was relatively stable. The seasonal mean of CO₂ background concentration was the lowest in summer, secondly in autumn and winter, and the highest in spring. The diurnal variation in CO₂ background concentration was most obvious in summer, with the peak and valley value around 5:00a.m. and 16:00p.m., respectively; the diurnal variation fluctuated slightly in other seasons with amplitudes merely between 0.7×10^-6 and 1.8×10^-6. Compared to the background concentration, the CO₂ uplifting concentration differed remarkably from October to March, whereas the change in absorption concentration occurred from June to September, indicating impacts of anthropogenic emission and terrestrial ecosystem carbon absorption on CO₂ concentration. The diurnal variation in source-sink concentrations displayed a single peak structure, and the rising concentration was high during the day and low at night, and the reversion was just for the absorption concentration. In spring, autumn and winter, the southwest wind was mainly responsible for the significant CO₂ uplift, and CO₂ concentration could stay at a high level with an increase in wind speed; while, in summer,the northeast easterly wind obviously enhanced the observed values. Besides, in spring and summer, the wind speed between 2 and 4m/s was conducive to reduce the CO₂ absorption concentration. Evidently, the impact of long-range transport of air masses on the source-sink concentrations depend not only on the source strength of CO₂ in the pathway, but also on the spatial vertical transport path of the air masses.

Key words： Wutai Mountain greenhouse gases regional background source-sink characteristics

Received: 18 January 2022

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X511

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	LI Ying
	YAN Shi-ming
	WANG Shu-min
	ZHANG Feng-sheng
	YU Xiao-hong
	YANG Ai-qin
	YUE Jiang
	JIN Ze-hui

Cite this article:

LI Ying,YAN Shi-ming,WANG Shu-min等. Studies on background concentration and source-sink characteristics of CO₂ in Wutai Mountain[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(8): 3572-3583.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I8/3572

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