冬季黄、渤海气态元素汞的分布及其来源分析

本研究采用2019年12月9日－12月19日黄、渤海连续在线监测的气态元素汞（GEM）浓度数据，分析了GEM的空间分布、来源及其影响因素。研究结果表明，GEM的平均浓度为（1.92±0.69）ng/m3，变化范围为0.80～4.17 ng/m3。GEM浓度空间差异明显，渤海的浓度高于黄海，最高浓度和最低浓度都出现在山东半岛南部海域。受污染事件及华北地区较高汞排放量的影响，气团携带了华北地区的污染物，近海GEM浓度升高，而来自西伯利亚冷气团中的GEM浓度较低。西向风时更易出现高浓度GEM，GEM浓度与风速呈显著负相关关系（r=?0.217，P<0.01），与气温呈显著正相关关系（r=0.417，P<0.01）。冬季，黄、渤海GEM浓度主要受陆地污染气团的影响。

Distribution and source analysis of gaseous element mercury in the Yellow Sea and Bohai Sea in winter

This study used the continuous online monitoring of gaseous element mercury (GEM) concentration data in the Yellow and Bohai Sea from December 9th to 19th 2019 to analyze the spatial distribution, source and influencing factors of GEM. The results showed that the average concentration of GEM was (1.92±0.69) ng/m3, and the variation range was 0.80～4.17 ng/m3. The spatial difference was obvious. The concentration of GEM in the Bohai Sea was higher than that in the Yellow Sea, but both the highest and lowest concentrations occurred in the southern sea area of the Shandong Peninsula. Affected by pollution event and high mercury emission in North China, the air mass carried the pollutants in North China, leading to an increase in the concentration of GEM offshore.The air masses from Siberia had lower GEM concentrations. High concentration of GEM was more likely to occur in westward wind. GEM concentration was significantly negatively correlated with wind speed (r=?0.217, P<0.01), and positively correlated with temperature (r=0.417, P<0.01). In winter, the concentration of GEM in the Yellow and Bohai Seas was mainly affected by onshore polluted air masses.