动力传输和地表排放对北京地区对流层臭氧长期变化的影响

Impact of Dynamic Transmission and Surface Emission on Ozone Change in Troposphere over Beijing

利用2003—2013年北京地区臭氧探空资料和多种再分析资料,结合CAM-chem模式模拟分析了北京地区对流层臭氧的长期变化趋势及影响因子。结果表明:近11 a来,北京地区对流层臭氧整体呈明显增加趋势,对流层臭氧总量每年增加约0.98 DU,且地表排放对该地区对流层臭氧增加的贡献相比动力过程更大。其中,由平流层向下输送造成的对流层臭氧总量每年增加约为0.13×10^(-3)~0.17×10^(-3)Tg,对北京地区对流层臭氧总量的增加贡献约20%;由水平输送造成的臭氧增加每年约为0.06×10^(-3)Tg,对臭氧总量增加贡献约10%;而由地表排放造成的对流层臭氧增加约占该地区对流层臭氧总增加量的60%。

Based on the ozone sounding data from the south suburb of Beijing radiosonde station,multiple reanalysis data and the simulation of CAM-chem model,the change trend of ozone and its influencing factors in troposphere over Beijing were investigated during 2003-2013.The results indicated that the ozone in troposphere over Beijing increased significantly during 2003-2013,and the total ozone in whole troposphere increased approximately 0.98 DU per year.The contribution of surface emission such as CO,NO X to the increase of ozone in troposphere over Beijing was larger than the dynamic transmission.The increases of ozone in troposphere were approximately 0.13×10-3 to 0.17×10-3 Tg per year due to the downward transport from stratosphere,and the increase was about 0.06×10-3 Tg per year due to the horizontal transport,which accounted for about 20%and 10%of the total increment of ozone in troposphere over Beijing,respectively.However,the increase of ozone caused by the surface emissions contributed about 60%to the total increment in troposphere over Beijing.