合肥和邢台近地面臭氧浓度日变化个例分析

Case Analysis on Diurnal Change of Ozone Concentration of Near Surface in Hefei and Xingtai

近地面臭氧污染日趋严重,对人类健康和动植物生长有显著危害.对合肥和邢台两地近地面臭氧结果进行了对比分析。2003~2004年期间合肥地区臭氧浓度日变化呈现较明显的早、中、晚"三峰型"结构;2016年5~6月观测期间邢台臭氧日变化主要呈现早、中"双峰"型结构。合肥臭氧观测站周围被树木环绕、水库包围,植物释放的挥发性有机物引发的光化学反应不容忽视;陆地和水面之间形成的湖陆风下沉气流是形成早晚次峰的主要原因。邢台属于复合型污染地区,臭氧浓度分析应综合考虑污染源、臭氧前体物成分、气象条件、地理位置等因素。合肥地区数据研究表明,强太阳辐射、温度较高、相对湿度较低的天气有利于臭氧生成。

The ozone pollution near surface is becoming a severe problem recently, which can damage human health, plants and the ecological environment seriously. The ＂triple-peak＂ model is discovered in the experiment of the diurnal variation of ozone concentration in Hefei, Anhui, China during 2003 and 2004. Meanwhile,the ＂double-peak＂ model is showed in Xingtai,Hebei, China during the experiment from May to June in 2016. The site of ozone observation in Hefei is surrounded by trees and reservoir, so the chemical reaction caused by the volatile organic compounds produced by the plants cannot be ignored. Moreover, the breeze downdraft between land and water is also a main cause for the formation of ＂peak in morning and evening＂in Hefei. Xingtai belongs to the heavy pollution area, the sources of ozone should be considered more comprehensively with the pollution sources, ozone precursor composition, meteorological actors, the geographical location, and so on. The correlation analysis shows that the strong sun radiation, high temperature and low relative humidity promote ozone formation.