2015-2019年贵港市臭氧污染特征及其与气象要素的关系

为研究贵港市O₃(臭氧)污染特征及其与气象要素的关系,对2015—2019年贵港市国家空气自动监测站和同期贵港国家气象观测站逐日、逐时气象资料进行了研究和分析。结果表明:近5a来贵港市O₃污染日趋严重;O₃污染存在明显的季节变化,秋>夏>春>冬;O₃浓度日变化特征呈单峰型,8:00出现谷值,15:00—16:00出现峰值;O₃浓度变化与气温、日照时数呈正相关,与相对湿度负相关,当日照时数大于8h、相对湿度40%~70%时易出现高浓度O₃;不同季节出现O₃浓度高值时的风向不尽相同。

Characteristics of ozone pollution and its relationship with meteorological factors in Guigang City from 2015 to 2019

In order to study the characteristics of O₃pollution in Guigang City and its relationship with meteorological elements,the daily and hourly meteorological observation data of Guigang national air automatic monitoring station and Guigang national meteorological observation station during 2015-2019 were analyzed.The results showed that O₃pollution in Guigang City had become more and more serious in the past 5 years;O₃pollution had obvious seasonal changes,pollution was the most serious in autumn,followed by summer,spring and winter.The daily variation of O₃concentration was a single peak,with a valley at 8am and a peak at 3pm-4pm.The change of O₃concentration was positively correlated with temperature and sunshine hours,and negatively correlated with relative humidity.When sunshine hours were greater than 8 hours and relative humidity was 40%~70%,high concentration of O₃was likely to occur.The wind direction was different in different seasons when O₃concentration was high.