Abstract:The whole air samples at ground level and in the layer between 900m and 3100m over Beijing City were collected in August 2007. Up to 50 volatile organic compounds (VOCs) species were quantified by using GC-FID/MS. Vertical profiles of VOCs and their chemical speciation were analyzed and influence of local emissions and regional transport on the measured VOCs was studied. VOCs concentration decreased significantly with the increase of altitude. The different vertical patterns of VOCs species were due to their atmospheric chemical reactivities, while atmospheric diffusion and long range transport might also affect the vertical distribution of VOCs. By investigating the backward trajectories and the variation of the relative abundance of long-lived VOCs species, the airborne VOCs were found to be mainly from the diffusion of local emissions, and also influenced by the plume transported from eastern and southern regions, e.g. Tianjin and Langfang cities, under some conditions.
王思源, 邵敏, 王玮. 北京市大气中VOCs垂直分布的航测研究[J]. 中国环境科学, 2009, 29(7): 679-684.
WANG Si-Yuan, SHAO Min, WANG Wei. The measurement of vertical distribution of airborne VOCs mixing ratios in Beijing. . CHINA ENVIRONMENTAL SCIENCECE, 2009, 29(7): 679-684.