北京城市大气CO_2浓度变化特征及影响因素  

Characteristics of Atmospheric CO_2 Variations and Some Affecting Factors in Urban Area of Beijing

作　　者：王长科[1] 王跃思[1] 刘广仁[1] 

机构地区：[1]中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室,北京100029

出　　处：《环境科学》2003年第4期13-17,共5页Environmental Science

基　　金：中国科学院知识创新工程重大项目 (KZCX1 SW 0 1 0 1B)

摘　　要：北京大气CO2 浓度日变化强烈 ,全年北京时间 1 5 :0 0时前后为全天最低值 ,最高值则出现在夜间 ,日变化幅度为 2 3 2～ 3 9 0 μmol·mol- 1,夏季和秋季日变化幅度比冬季和春季大 .北京城区大气CO2 浓度季节变化明显 ,最大值出现在冬季 ,月平均浓度为 42 1 5～ 441 0 μmol·mol- 1;最小值则在夏季 ,月平均浓度 3 67 4～ 3 71 6μmol·mol- 1.北京CO2 浓度的季节变化幅度明显高于附近的华北兴隆区域站和瓦里关山大陆本底站等的相应值 ,其原因是北京CO2 浓度季节变化主要受人为取暖活动控制 ,同时植被的季节变化也起一定作用 .1 993～ 1 995年北京大气CO2 浓度上升较快 ,平均增长率为 3 7%·a- 1,1 995年平均浓度达到最高 ,为 40 9 7± 2 5 9μmol·mol- 1。The diurnal variation of the atmospheric CO 2 at the urban area in Beijing displayed a very clear cycle, generally with the lowest value being recorded at about 15:00 local time and the highest in the nighttime. The differences between the maximums and the minimums ranged from 23 2 to 39 0μmol·mol -1 in the four seasons and the ones of summer and fall were bigger than that of winter and spring. It showed a large seasonal cycle with a maximum in winter, from 421 5 to 441 0μmol·mol -1 , and a minimum in summer, between 367 4 and 371 6μmol·mol -1 . The peak to peak amplitude of atmospheric CO 2 in Beijing, controlled mostly by the anthropogenic activities and seasonal variation of vegetation, was higher than that in Xinglong Station, Hebei Province and China Global Atmosphere Watch Baseline Observatory (Waliguan). The concentration of atmospheric CO 2 in Beijing increased rapidly at a mean growth rate of 3 7%·a -1 from 1993 to 1995. After displaying a peak of 409 7±25 9μmol·mol -1 in 1995, it decreased slowly.

关 键 词：大气CO2 温室气体 城市环境 北京 

分 类 号：X131[环境科学与工程—环境科学]