成都市O3浓度的时间变化特征及相关因子分析

摘要

The seasonal variation, daily variation, “weekend effect”and the “holiday effect” of ozone concentration in Chengdu, Sichuan province were analyzed to study the temporal distribution pattern and affecting factors of ozone, based on the monitoring data of ozone concentration at Renmin South Road station and meteorological data at Wenjiang station from January 1 to December 31, 2013. Results showed that, the ozone concentration in summer is significantly higher than other seasons like winter, the maximum occurred in August. Diurnal variation of ozone concentration showed obvious characteristic of one single peak, and attained its peak at 15:00 in summer and at 16:00 in winter. The “weekend effect” of ozone was observed that ozone concentration on weekend is higher than that on work days,the “holiday effect” was relatively complex due to the different meteorological conditions and human’ activities between different holidays. The diurnal average concentration of ozone is obvious negative correlated with NO、NO2、NOx and relative humidity,and is obvious positive correlated with wind speed and temperature.%为深入认知成都市O3浓度的时间变化规律及其影响因子,基于2013年1月1日—12月31日市区站点O3、NO、NO2、NOx的逐时监测资料以及成都市气象站的气象数据逐时观测资料,据此对O3的季变化、日变化、“周末效应”、“节假日效应”进行了讨论,并对其浓度影响因子进行分析。结果表明：成都市O3浓度季变化呈现明显夏高冬低的特征,浓度最大值出现在8月。 O3浓度日变化为单峰型,夏季峰值出现在15：00,冬季峰值出现在16：00。市区存在“周末效应”,即周末O3浓度总体比工作日高；“节假日效应”则表现出复杂多变性,受气象条件以及人为活动等多种随机因素的影响。 O3日平均浓度与NO、NO2、NOx、相对湿度呈明显负相关,与温度、风速呈明显正相关。