冬季降雪过程对城市大气气态汞污染的影响(4)

冬季降雪过程对城市大气气态汞污染的影响

508 生态环境学报 第19卷第3期（2010年3月）

出现在上午6—9时，其变化趋势与相对湿度基本一致；降雪期间的气态总汞变化趋势无明显规律性。

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Influence of snowing event on gaseous mercury concentration

in urban atmosphere

TONG Yindong, ZHANG Wei, HU Dan, WANG Xuejun

Ministry of Education Laboratory of Earth Surface Processes//College of Urban and Environmental Sciences, Peking University, Beijing 100871, China

Abstract: An intensive field monitoring campaign was conducted for measurement of total gaseous mercury (TGM) in Beijing urban area during the snow period, 2009. Results show the mean concentration of TGM within 96 hours after the first snowing event is about 70% of the concentrations during dry days. The impact of meteorological factors on TGM concentration, including air pressure, wind speed, gust speed, temperature and relatively humidity, were analyzed. Results indicate that the meteorological influences on TGM were mainly caused by wind speed (r= -0.527), gust wind speed (r= -0.574) during the snow period; while during dry days, influences were caused by wind speed (r= -0.691), gust wind speed(r= -0.726) and relatively humidity(r= 0.692). During dry days, the TGM in the mid-night and early morning was much higher, and the daily variation showed a similar trend with the relative hu-midity; while during snow days, no clear variation pattern was observed.

Key words: snowfall; total gaseous mercury (TGM); meteorological factors; daily variation

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