摘要
北京大气中可形成气溶胶的有机污染物增加迅速 ,并有明显的季节变化、日变化和空间变化。其中含量最高增长也最快的是BTXE ,1 995～ 1 998年增长率为 2 0 % /a,1 998～ 1 999年增长率突增为 1 2 8% /a,但CFCs增长速率有所减慢。BTXE冬季出现峰值 ,夏季出现谷值 ,峰值比谷值高 3～ 5倍 ;CFCs夏季出现明显峰值 ,但变化幅度比BTXE相对小。晴风天气与阴雾天气有相反的日变化形式 ,阴雾天大气的BTXE含量比晴风天的高2～ 3倍。北京城乡结合部的三、四环路地区污染物含量最高 ,天安门、中关村和石景山区大气污染程度相近。
The concentrations of organic pollutants are increasing dramatically, with significant seasonal, daily and spatial variation Among them, BTXE have the highest value of concentration and increasing rate From 1995 to 1998, the average increasing rate of BTXE was 20%/a There was a sharply increasing from 1998 to 1999, although with a slow-down at the rate of CFCs For BTXE, its peak value appears in winter, about 3～5 times more than its valley values which appears in summer With the significant peak value in summer, the variation of CFCs is comparatively less than that of BTXE Daily variation pattern in clear weather is different from that in foggy weather The average concentration of BTXE in foggy weather is 2～3 times more than that in clear day At the edge of the urban areas in Beijing, the concentrations of organic pollutants around the 3rd and the 4th Ring Road areas is the highest, while the pollution levels in Tian′anmen Square (political center) and Zhongguancun (science city) are almost the same as Shijingshan (industrial area)
出处
《气候与环境研究》
CSCD
2000年第1期13-19,共7页
Climatic and Environmental Research
基金
中国科学院大气物理研究所所长重点基金项目!98-2 0 9的资助
