北京城区大气CH_4浓度及其变化规律  

Variations of Atmospheric Methane in Urban Area of Beijing

作　　者：王长科[1] 王跃思[1] 刘广仁[1] 李晶[1] 王明星[1] 

机构地区：[1]中国科学院大气物理研究所

出　　处：《环境科学研究》2003年第6期43-45,共3页Research of Environmental Sciences

基　　金：中国科学院知识创新工程重大项目(KZCX1-SW-01)

摘　　要：研究表明:北京城区大气CH4浓度日变化总特征是白天浓度低,夜间浓度高;大气CH4浓度季节变化呈明显的双峰模态,分别在夏末和冬季各出现一个峰,冬季峰值主要是人为源造成的;1985—2000年,北京城区大气CH4摩尔分数平均值为(1883 4±73 0)nmol mol,年平均增长率为0 82%,均比全球平均水平高,但20世纪90年代的增长速率比80年代末期低。The diurnal variation of the atmospheric CH\-4 at the urban area in Beijing displayed a very clear cycle,generally with the lowest value being recorded in the daytime and the highest at night.It showed a large seasonal cycle with two peaks,one in later summer and the other in the winter.The peak in the winter was contributed mostly by anthropogenic methane sources.The concentration of atmospheric CH\-4 in Beijing increased rapidly at an annual rate of 0.82% from 1985 to 2000,with a mean of (1 883.4±73.0)nmol/mol.But the growth rate in the 1990s was lower than that in late 1980s.

关 键 词：大气CH4 温室气体 城市环境 北京 

分 类 号：X142[环境科学与工程—环境科学] X820.1