基于IASI的中国NH<sub>3</sub>浓度及排放时空分布特征分析

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Abstract Based on the NH₃ column concentration data inverted by the infrared atmospheric sounding interferometer (IASI), the NH₃ emissions in China from 2008 to 2016 were estimated using an emission flux box model and dynamic NH₃ lifetimes. Then, the spatial distribution and long-term trends of NH₃ concentrations and emissions in China were analyzed by combining land cover types, population density and population growth in China. The results indicated that the average column concentration, the emission flux density, and the emissions of NH₃ in China from 2008 to 2016 were 6.81×10¹⁵molec/cm², 1.43g/m², and 10.09 Tg, respectively. The concentrations of NH₃ in Shandong and Henan provinces increased the fastest, with average annual growth rates of 1.47×10¹⁵ and 1.23×10¹⁵molec/(cm²·a), respectively. The high concentration and high emission intensity mainly appeared in North China, central Xinjiang and the Sichuan basin, showing a decreasing trend from center to periphery, which is basically consistent with the distribution of China's arable land and high-population-density areas. The overall NH₃ emissions in China showed an upward trend, increasing from 9.33 Tg in 2008 to 13.96 Tg in 2016, and increased from 4.96% to 24.88% of the global emissions. During this period, the northwestern and northern regions of China contributed 47.50% of the total emissions, while the Tibetan Plateau region accounted for only 2.65%. The NH₃ concentration in China has the seasonal characteristic of "high in summer and low in winter", and each season accounts for 28.96%, 49.84%, 13.02% and 8.17% of the total annual concentration, respectively, which indicates that the contribution of frequent agricultural activities and fertilizer application to NH₃ concentration in spring and summer cannot be ignored. The NH₃ concentrations and emissions show significant spatiotemporal differences in China, thus preparation of air pollution control plans for different periods of time and regions will be more effective in reducing NH₃ emissions.

Key words： NH₃ emissions infrared atmospheric sounding interferometer (IASI) NH₃ lifetime PM_2.5 pollution spatial and temporal distribution

Received: 11 October 2023

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	WEN Peng-fan
	ZHANG Chun-kang
	YANG Qing-hua
	YANG Zheng-xiongfeng
	LI Guo-qing

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WEN Peng-fan,ZHANG Chun-kang,YANG Qing-hua等. Characterization of spatial and temporal distribution of NH₃ concentrations and emissions in China based on IASI observations[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(6): 3040-3051.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I6/3040

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