新疆乌鲁木齐市大气中气态元素汞的浓度及变化特征分析

Analysis of the Concentration and Variation Characteristics of Gaseous Element Mercury in the Atmosphere in Urumqi,Xinjiang

于2021年11月—2022年9月对乌鲁木齐市不同区域气态元素汞(GEM)的浓度进行实时监测,对周边燃煤锅炉进行抽测,并结合激光雷达探测技术进一步探究乌鲁木齐市冬季和夏季大气污染物的垂直分布情况,综合分析乌鲁木齐市GEM浓度的时间和空间变化特征。结果显示,乌鲁木齐市GEM质量浓度为1.56~10.70 ng/m^(3),平均质量浓度为(4.45±1.38)ng/m^(3),高于北半球背景值浓度;冬季GEM质量浓度高于夏季,具有显著的季节变化特征;日变化特征表现为夜间GEM质量浓度高于白天。研究结果为后期乌鲁木齐市制定有效的环境保护措施和推动可持续发展提供科学依据。

From November 2021 to September 2022,the atmospheric gaseous elemental mercury(GEM)concentrations in different regions of Urumqi had been monitoring for one week per quarter,meanwhile the surrounding coal-fired boilers were sampled,and the vertical distribution of pollutants in winter and summer in Urumqi was further explored by Lidar detection technology,and the temporal and spatial variation characteristics of atmospheric GEM concentrations in Urumqi were comprehensively analyzed.The results showed that the average concentrations of GEM in the atmosphere was 4.45±1.38 ng/m^(3),which was higher than the background concentrations in the Northern Hemisphere,and the atmospheric GEM concentrations in winter was higher than that in summer,with significant seasonal variation characteristics,and the diurnal variation characteristic showed that the GEM concentrations of the atmosphere in the night were higher than those in the daytime.In this paper,the atmospheric GEM concentrations in Urumqi were monitored for the first time,which provides scientific support for the furture control of atmospheric mercury in Urumqi.