合肥地表臭氧变化特征及气象要素影响分析

利用 2014–2020 年 O3 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 O3 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 O3 浓度的影响。研究结果表明: 合肥地区 O3 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 (O3-8h) 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; O3-8h 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, O3 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。

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

Based on the monitoring data of O3 concentration from 2014 to 2020 and the meteorological data of automatic meteorological station in the same period, the daily and monthly variation rules of O3 concentration on the surface of Hefei, China are studied, and the influence of temperature, humidity, wind speed and other meteorological factors on O3 concentration is analyzed. The results show that O3 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 O3 concentration (O3-8h) 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 O3-8h 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 O3 concentration is basically the same as that of temperature, but has no obvious relationship with the variation trend of humidity