海南五指山大气气态总汞含量变化特征  

Variation Characteristics of Total Gaseous Mercury at Wuzhi Mountain( Wuzhishan) Background Station in Hainan

作　　者：雷育涛[1] 刘明[1] 陈来国[1] 谢东海[2] 林道征 赵明江 张毅强[1] 孙家仁[1] 

机构地区：[1]环境保护部华南环境科学研究所,城市生态环境研究中心,广州510655 [2]海南省环境科学研究院,海口571126 [3]五指山市环境资源监测站,五指山572200

出　　处：《环境科学》2015年第3期817-823,共7页Environmental Science

基　　金：环境保护公益性行业科研专项(200809011);国家自然科学基金项目(41105082)

摘　　要：利用高时间分辨率自动测汞仪(Tekran 2537B)于2011-05~2012-05对五指山大气气态总汞(TGM)进行了连续1 a的观测.结果表明,五指山TGM含量为(1.58±0.71)ng·m-3,与全球大气汞背景值相当,表明五指山大气几乎没有受到明显的大气汞污染.TGM的月变化特征表现为2011年6~8月和2012年3~5月TGM含量较低,2011年9月~次年1月含量较高,热带季风是影响TGM月变化的主要因素.五指山TGM具有明显的日变化特征,小时均值最低值出现在09:00,峰值出现在19:00,白天TGM浓度低于晚上.日变化受汞长距离迁移和本地气象条件的共同影响.后向轨迹分析结果表明大气汞从中国大陆的长距离迁移为五指山TGM浓度升高的主要原因.Total gaseous mercury( TGM) was continuously monitored at Wuzhi mountain( Wuzhishan) using the high-resolution automatic atmospheric mercury vapor analyzer( Tekran 2537B) from May 2011 to May 2012. The annual geometric mean TGM concentration was( 1. 58 ± 0. 71) ng·m- 3,suggesting that the atmosphere was not obviously polluted. The TGM level at Wu Zhi mountain remained low from June to August in 2011 and from March to May in 2012,while higher values were observed from September in 2011 to January in 2012. Tropical monsoons played an important role in the monthly variation of TGM. TGM concentrations showed a clear diurnal trend with the minimum concentration occurring at 09: 00 AM and the peak concentration at 19: 00 PM due to the combined impact of the long-range transport of atmospheric mercury and local meteorological conditions. The temporal trend of TGM highlighted the impact of long-range transport from the mainland of China on the distribution of TGM in ambient air at Wuzhi mountain by the results of backward trajectory analysis using HYSPLIT.

关 键 词：大气气态总汞 五指山 月变化 日变化 后向轨迹 

分 类 号：X51[环境科学与工程—环境工程]