北京大气CH_4、CO_2、TOC日变化规律及垂直分布的自动连续观测  

Auto-measurement of the diurnal variation anduprightness distributing of atmospheric CH_4,CO_2,TOC in Beijing

作　　者：何新星[1] 王跃思[1] 刘广仁[1] 孙扬[1] 

机构地区：[1]中国科学院大气物理研究所,北京100083

出　　处：《中国环境监测》2005年第3期62-66,共5页Environmental Monitoring in China

基　　金：国家自然科学基金项目(40222202);中国科学院全国优秀博士学位论文专项资金

摘　　要：提出了一种能自动连续监测CH4、CO2、TOC日变化及垂直分布的系统,利用该系统监测了2002年冬季CH4、CO2、TOC垂直分布的日变化的变化趋势。结果发现,距地面高度增加,受湍流扩散的影响,CH4、CO2、TOC浓度降低。冬季CH4浓度的日变化呈现明显的单峰周期变化,CO2日变化呈双峰形分布,TOC日变化没有明显的特征,其日变化受机动车尾气排放的影响很大。根据2002年冬季CO2浓度与2000年以前的对比结果发现,北京市冬季燃煤排放的污染物已处于一个相对稳定期,而随着北京市机动车保有量迅速增加,尾气排放成为影响某些大气微量气体日变化的主要因素。The method of continuous measurement of atmospheric CH_4/CO_2/TOC is introduced; also the results of the diurnal variation and uprightness distributing of atmospheric CH_4/CO_2/TOC in Beijing are presented. From the results it is known that the concentration of the three gases reduced with the increase of the height, influenced by the overflow of the atmosphere. In the winter of 2002 in Beijing, one peak of CH_4 concentration and two peaks of CO_2 occur. The diurnal variation of TOC was great influenced by vehicle exhaust. Contrasting the concentration of CO_2 in the year 2002 and before 2000, the contamination exhausted by coal burning was stabilization in Beijing. With the increased of vehicle, the vehicle exhaust become the main factor influencing the diurnal variation of some trace gases in atmosphere.

关 键 词：自动监测 CH4、CO2、TOC 垂直分布 日变化 尾气排放 

分 类 号：X823[环境科学与工程—环境工程]