气象因素对泰山顶大气中苯系物浓度的影响分析

Effect of meteorological factors on atmospheric BTEX on the top of Mount Tai

利用SUMMA罐容器捕集法-气相色谱质谱法对2015年6月到7月采集的泰山气象站大气样品进行处理分析,与不同背景的其他站做浓度比对,统计该站点同期不同天气条件下的变化情况,以探究泰山顶部气象因素对苯系物浓度的影响。结果表明:泰山苯系物平均浓度为9.71μg/m 3,跟其他背景站点相比处于中低水平;雾天苯系物浓度明显高于晴天,与气象扩散条件有关;受光照条件影响,夜间污染物浓度高于白天。对苯系物浓度较高的7月14日、24日做48小时后推气流轨迹的分析发现,位于东北、东南部工业城市的污染物随着气团移动通过自由对流层远距离输送方式到达泰山,是导致该日泰山顶部苯系物浓度偏高的主要原因。

Atmospheric samples were collected by using SUMMA canisters on the top of Mountain Tai from June to July,2015.The samples were treated and analyzed by GC-MS,and then compared with samples collected at other meteorological stations.The changes of atmospheric BTEX on the top of Mountain Tai under different meteorological conditions were recorded,and the influence of meteorological factors on atmospheric BTEX was analyzed.The results showed that the average concentration of BTEX on the top of Mountain Tai was 9.71μg/m 3,which was at the mid-low-level compared with other meteorological stations.The concentration of BTEX in foggy days was much higher than that in sunny days,which was affected by the weather condition unfavorable to air diffusion.The concentration of BTEX at night was higher than that in the day,which was related to sunlight.The BTEX back trajectory analysis of July 14 and July 24 showed that the air masses from the polluted industrial cities in the northeastern and southeastern China might have resulted in the increase of BTEX on the top of Mountain Tai.