Comparison of characteristics of ozone vertical distribution above Lin' an, Kunming, and Hong Kong during Spring 2001

Abstract

The ozone experiment at three sites (LinAn, KunMing and Hong Kong) was simultaneously conducted for the first time in China during March-April 2001. Based on the ozone data obtained by this experiment and the ozone sounding data of Hong Kong from 1994 to 2000, we analyzed and compared the characteristics of ozone vertical distribution above these three sites. The results show that there exist different and general characteristics among the three sites ozone vertical distributions. The main difference of the three sites ozone vertical distributions is as follows: both the maximum ozone partial pressure and its altitude are different; the ozone concentration at 10 - 16 km height of Lin'an is much higher than that of Kunming and Hong Kong; there exists one high ozone concentration layer over the Hong Kong and Kunming, but Hong Kong is more obvious; in the upper troposphere there is no lower ozone distribution over Lin' an. Based on the NCEP analyzed data, the atmospheric circulations of March 2001 reveals that the different atmospheric circulations can lead to the different ozone vertical distribution above these three sites.