中国北部沙漠及周边地区土壤NOx排放通量的估算

doi:10.13866/j.azr.2025.05.05

Abstract

Abstract:

Previous studies have demonstrated that notable amounts of nitrogen oxides (NO_X) are emitted from desert surfaces, and these emissions likely play a crucial role in the atmospheric reactive nitrogen cycle within the desert regions. However, quantitative assessments of NO_X emissions in these regions are scarce, which limits our understanding of the environmental consequences thereof. This study aimed to quantify the soil NO_X emission fluxes in the deserts and surrounding areas of Northern China to provide a basis for understanding the ecological benefits of desert NO_X emissions. Based on the law of conservation of mass, we utilized NO₂ vertical column density (NO₂VCD) data from the Tropospheric Monitoring Instrument (TROPOMI) onboard the Sentinel-5P satellite for the deserts and surrounding areas of Northern China. The study quantified the soil NO_X emission fluxes by subtracting the effects of atmospheric horizontal transport, diffusion, chemical transformation, deposition, and anthropogenic emissions of regional NO_X. The results revealed the following: (1) The mean soil NO_X emission flux in the deserts and surrounding areas of Northern China is 17.6 ng·m^-2·s^-1, ranging from 0 to 85 ng·m^-2·s^-1. Lower emission fluxes were predominantly observed in the central regions of the desert, whereas the Gobi surrounding the desert exhibited higher emission fluxes. (2) Among the different desert areas studied, the Badain Jaran Desert and surrounding areas have a mean emission flux of 13.1 ng·m^-2·s^-1, which is significantly lower than the 26.0 ng·m^-2·s^-1 emission flux observed in the Tengger Desert and surrounding areas (P<0.0001). This study provides a robust estimation of the soil NO_X emission fluxes in the deserts and surrounding areas of Northern China, thereby enhancing our understanding of how desert ecosystems contribute to atmospheric chemistry and laying a solid foundation for future research in desert atmospheric chemistry.

Key words: desert air, ozone, top-down approach, surface-atmosphere exchange

ZHOU Fei, WANG Changyan, WANG Fang, WU Qiaoli, SU Xiaoli, ZHANG Daizhou, WU Feng. Estimation of soil NO_X emissions in the deserts and surrounding areas of Northern China[J].Arid Zone Research, 2025, 42(5): 820-828.

Figures/Tables 5

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Fig. 3

Tab. 1

Tab. 2

References 46

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区域		整个区域	沙地	戈壁	草地	盐碱地
巴丹吉林沙漠及周边区域	平均值/（ng·m^-2·s^-1）	13.1	11.2	15.6	16.2	20.3
	最大值/（ng·m^-2·s^-1）	51.6	47.5	51.6	49.8	45.2
	最小值/（ng·m^-2·s^-1）	0.0	0.0	0.1	0.2	7.2
腾格里沙漠及周边区域	平均值/（ng·m^-2·s^-1）	26.0	25.1	35.4	23.7	27.5
	最大值/（ng·m^-2·s^-1）	84.5	84.5	79.1	50.3	60.2
	最小值/（ng·m^-2·s^-1）	0.4	0.7	4.2	0.4	1.9

生态系统	变化范围/（ng N·m^-2·s^-1）	平均值/（ng N·m^-2·s^-1）	文献
沙漠及其周边区域
中国北部	0~29.2	6.0	本研究
莫哈维沙漠	干土：0~5.5 湿土：0~160.0	-	McCalley和Sparks（2009）^[12]
莫哈维沙漠	干土：0~5.5 湿土：0~160.0	-	McCalley和Sparks（2009）^[12]
奇瓦瓦沙漠	干土：0~0.3 湿土：0.3~97.0	-	Hartley和Schlesinger（2000）^[11]
奇瓦瓦沙漠	干土：0~0.3 湿土：0.3~97.0	-	Hartley和Schlesinger（2000）^[11]
森林
温带森林	0~0.6	0.3	Davidson和Kingerlee（1997）^[16]
热带森林	0.1~1.4	0.6
草地
温带草原	0~5.7	3.8
热带稀树草原	0.3~32.0	9.8

Estimation of soil NO_X emissions in the deserts and surrounding areas of Northern China

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Estimation of soil NOX emissions in the deserts and surrounding areas of Northern China

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Estimation of soil NO_X emissions in the deserts and surrounding areas of Northern China