海南岛臭氧污染时空特征及其成因分析

Research Advances in the spatio-temporal distribution and causes of ozone pollution in Hainan Province

近年来,海南岛臭氧污染特征及其来源分析和防治工作引起了普遍重视。海南岛城市臭氧(ozone,O3)浓度较稳定,但O3污染超标事件还是时有发生。从最大8 h滑动平均O3浓度(O3-8h)和超标天数上看,其分布特征呈现海南岛北部和西部偏高,中部、东部和南部偏低;其月变化表现为“双峰型”,最大值出现在10月份。人为排放的氮氧化合物(NOX)和挥发性有机物(VOCS)是海南岛O3污染产生的重要前体物;高温、低湿、低风速和有利风向会造成O3浓度升高;气候变化也会在一定程度上影响着海南岛O3污染的变化。

In recent years the concentration of urban ozone(O3)in Hainan Province has been stable relatively,but O3 pollution events have occurred frequently,and its source and characteristics have attracted the attention of government and local people.In this context the researches on O3 pollution in Hainan over the years from 2015 to 2020 were reviewed.The review showed that the running 8 h average O3 concentration(O3-8h)and the number of days exceeding the standard are higher in northern and western Hainan than in middle,eastern and southern Hainan,and their monthly variation is bimodal,with the maximum value appearing in October.Man-made emissions of nitrogen oxides(NOX)and volatile organic compounds(VOCS)are very important for formation of O3 that generates O3 pollution in Hainan Province.In addition,high temperature,low humidity,low wind speed and favorable wind direction will lead to elevation of O3 concentration,and climate change will also affect O3 pollution in Hainan Province.