合肥地表臭氧变化特征及气象要素影响分析

Analysis on variation characteristics of surface ozone and influence of meteorological elements in Hefei

利用2014–2020年O_(3)浓度监测资料和同期自动气象站气象数据,研究了合肥地表O_(3)浓度的日变化和月变化规律,分析了温度、湿度、风速等气象要素对O_(3)浓度的影响。研究结果表明:合肥地区O_(3)浓度具有典型的单峰型日变化特征,通常在15:00左右达到峰值,在07:00左右降至日最低值;最大8 h滑动平均值(O_(3)-8h)月均浓度变化呈“M”型,一般在6月和8月达到全年最高,在1月和12月降为最低;O_(3)-8h月均最高值是最低值的2.8~3.7倍,平均为3.1倍;受气象要素影响, O_(3)浓度年变化规律与温度基本一致,与湿度的变化趋势关系不明显。

Based on the monitoring data of O_(3) concentration from 2014 to 2020 and the meteorological data of automatic meteorological station in the same period, the daily and monthly variation rules of O_(3) concentration on the surface of Hefei, China are studied, and the influence of temperature, humidity, wind speed and other meteorological factors on O_(3) concentration is analyzed. The results show that O_(3) concentration in Hefei area has typical unimodal diurnal variation characteristics, which usually reaches the peak at about 15:00 and drops to the lowest daily value at about 07:00. The variation of monthly average of the maximum 8 h moving average of O_(3) concentration(O_(3)-8h)shows an “M” type, which generally reaches the highest level in June and August, and falls to the lowest level in January and December, the monthly maximum value of O_(3)-8h was 2.8~3.7 times of the minimum value, and the average value was 3.1 times. Affected by meteorological factors, the annual variation rule of O_(3)concentration is basically the same as that of temperature, but has no obvious relationship with the variation trend of humidity.