北京地区大气氨时空变化特征

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Abstract Considering the variables in meteorological characterizations including wind direction, wind speed, temperature and relative humidity, a three-year and one-year online observation of ammonia was conducted at Beijing urban sites and Shangdianzi background station separately, for analyzing the temporal and spatial changes of NH₃ concentration and influencing factors in Beijing. The average annual NH₃ concentration in Beijing urban was (32.5±20.8)×10^-9V/V, which was significantly higher than that in background station[(11.6±10.3)×10^-9V/V] and many major cities and regions both in China and foreign countries. The seasonal variation characteristics exhibited that the average concentrations of NH₃ were higher in summer than those of in winter, with giving (34.1±6.8)×10^-9V/V and (11.1±2.2)×10^-9V/V in summer, and (19.7±9.3)×10^-9V/V and (2.4±0.6)×10^-9V/V in winter, in terms of Beijing urban and background area, respectively. Moreover, the effect of meteorological factors on daily variation of NH₃ is significant. In spring, the peak value of NH₃ concentration in urban appeared at 15:00, which was earlier than that at 20:00 in background area under the influence of southwest wind. In contrast, the time for reaching highest concentration in urban area delayed in winter and was slightly later than that of background area, with cresting at 23:00 and 20:00 respectively. During summer, the NH₃ concentration in urban area peaked at 7:00, whereas dual crest value of NH₃ concentration in background area occurred twice at 09:00 and 22:00. In autumn, urban and background area had presented the same diurnal variation with peaking approximately at 22:00. The southwest wind was the main reason that leads to the changes of NH₃ concentration in the background area, where the concentration rise remarkably with the increase of southwest wind speed in spring and summer. However, concentration weighted trajectory analysis (CWT) drove that surrounding areas involving Beijing, Tianjin, Hebei and northern Henan contributed to the varying concentrations in Beijing urban areas, were the main sources of NH₃ affecting Beijing urban areas and background stations.

Key words： NH₃ Shangdianzi background station regional transportation hybrid single-particle Lagrangian integrated trajectory (HYSPLIT) model concentration weighted trajectory(CWT)

Received: 28 January 2021

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	Articles by authors
	LIU Xiang-xue
	PU Wei-wei
	MA Zhi-qiang
	LIN Wei-li
	HAN Ting-ting
	LI Ying-ruo
	ZHOU Li-yan
	SHI Qing-feng

Cite this article:

LIU Xiang-xue,PU Wei-wei,MA Zhi-qiang等. Study on the temporal and spatial variation of atmospheric ammonia in Beijing[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(8): 3473-3483.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I8/3473

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