摘要
通过对北京市市区内大于10 000 m2的10个湖泊上空0.5 m处甲烷浓度的季度观测,研究了北京市城市湖泊上空甲烷的浓度水平,并对其中4个典型的湖泊进行了每月1~2次的观测,分析了城市湖泊上空甲烷浓度的连续变化特征。结果表明湖泊上空甲烷浓度年平均值为2.337±0.431 mL/m3,高于全球均值和其他相关研究人员对北京市上空监测的结果。湖泊上空甲烷浓度季节之间的差异性显著(P<0.01),夏季的甲烷浓度较高(2.758±0.516mL/m3),秋季和春季相对较低。4个典型湖泊上空甲烷浓度连续变化具有一定的规律,大都在7-8月份达到甲烷浓度的高峰期,3月初融冰时都会有小幅增加;位于市中心的什刹海上空甲烷浓度相对较高。这表明了北京市内湖泊是甲烷排放的一个重要源头,同时也反映了北京作为一特大城市,其湖泊上空甲烷浓度受人类活动影响的特征。
The concentrations of methane were determined quarterly from the ten urban lakes greater than 10 000 m 2 in Beijing.And the continuous monitoring was carried out in four typical lakes.The results showed that the methane concentrations was higher than that of the global average and those from the urban lakes of Beijing.And the annual average concentration was 2.337±0.431 mL/m 3,which was higher than other monitoring results in Beijing atmospherice.Throughout the year the methane concentration between seasons...
出处
《城市环境与城市生态》
CAS
CSCD
2009年第6期1-5,共5页
Urban Environment & Urban Ecology
基金
中国科学院知识创新重要方向性项目(KZCX2-YW-422)
科技部国家重点实验室专项经费(SKLURE2008-1-01)
关键词
城市湖泊
甲烷浓度
季节特征
urban lake
the methane concentration
seasonal variation characteristic