贵阳市近地面臭氧浓度变化及时空分布特征

Characteristics of the near surface ozone concentration and the spatial and temporal distribution in Guiyang

运用2013-2017年贵阳市10个环境空气自动监测站O3的监测数据,分析全市及各区县近地面O3浓度年度、季节变化和日变化特征,对其浓度影响因子进行分析。结果表明:贵阳市及各区县近地面O3年均浓度2013-2016年逐年升高,2017年略有下降,呈现出春季>夏季>秋季>冬季的特点,O3月均浓度在4月和5月达到最大值,最小值出现在11月。从各区县看,贵阳市郊区的花溪区、观山湖区和乌当区的O3年均浓度较高,中心城区南明区和云岩区相对较低,经开区最低。O3浓度呈明显“单峰型”日变化特征,出现峰值的时刻在各季节也有所不同,最大峰值出现在15时左右,最低值在08时左右出现。O3浓度与NO、NO2、NOx、相对湿度呈明显负相关,与温度、风速呈正相关。

Based on the observation data of O 3 in 10 air automatic monitoring sites of Guiyang from 2013 to 2017, the yearly, seasonal, and daily variation and affecting factors of O 3 concentration near the surface in Guiyang and its districts and counties were analyzed. Results showed that, the average yearly O 3 concentration near the ground in Guiyang City and its districts and counties increased year by year from 2013 to 2016 , and decreased in 2017,showing the characteristics of O 3 concentration in spring > summer > autumn > winter, the maximum occurred in April and May, and the minimum appeared in November. From the spatial distribution, the concentration of O 3 in Huaxi District, Guanshanhu District and Wudang District is relatively higher, which are in the suburbs of Guiyang, while that in Nanming District and Yunyan District in the urban center is relatively lower, and that in Jingkai District is the lowest. The O 3 concentration showed a distinct "unimodal" daily variation. The peak appeared at different times in each season. The peak appeared at around 15 o'clock and the lowest value appeared around 08:00.The concentration of O 3 was significantly negatively correlated with NO, NO 2, NOx and relative humidity, and positively correlated with temperature and wind speed.