Abstract:

Ozone concentration characteristics of different functional areas in Shanghai were analyzed by using the data from 2006 to 2010 in Xujiahui,Chongming,Baoshan,Jinshan,and Pudong stations. The ozone data showed that ozone concentrations in Shanghai were low in central city and high in suburban areas; the higher concentrations of NOx in central city and heavy downtown areas suppressed the generation of ozone,which was the reason of the lower ozone concentration in central city. The results showed that the annual concentrations of ozone in 2006 were the lowest During 2006-2010,and the differences of annual variation of ozone concentrations in Xujiahui and Pudong stations were the most obvious,mainly due to the lower ozone concentrations in late spring and summer of 2006. Considering the weather conditions,wind speed,sunshine duration and ozone precursor (NOx and VOCs) concentrations,the lower concentrations of VOCs and the lower ratios of VOCs and NOx were the major reasons causing low ozone concentrations in the urban area of Shanghai in 2006.The concentrations of NOx and VOCs from April to August in 2006 were generally low. And the ratios of VOCs/NOx during typical ozone diurnal cycle in 2006 were quite small and average value was only 1.22,which was 65% lower than those in 2007 and 2008,while the ozone productivity in 2006 was also reduced 65% and 59%,respectively compared with in 2007 and 2008. The result derived from OZIPR also revealed that the lower concentrations of VOCs and the lower ratios of VOCs/NOx were the major reasons causing low ozone concentrations in 2006 in the urban area of Shanghai