遵义臭氧时空变化特征及与气象条件的关系

Ozone in Zunyi: Spatio-temporal Variation Characteristics and the Relationship with Meteorological Conditions

为了研究云贵高原城市遵义O3分布特征及与气象条件的关系,通过对遵义市城区2014—2017年连续4年环境监测站和气象站观测数据的分析。结果表明:(1)遵义市O3浓度超标率较之前增长较快;(2)遵义市O3浓度基本呈现夏、秋季高,春、冬季低的季节特征,O3-8h浓度最高月份一般出现在5月,峰值为52.71μg/m3,谷值出现在11月为26.18μg/m3。这与夏、秋季平均日照时间长、平均气温高有很大的关系;(3)遵义市O3浓度日变化曲线呈单峰型分布,白天浓度明显高于夜间,峰值一般出现在16:00左右;(4)城市大气污染主要源自局地排放和化学转化,太阳辐射、气温、风速、日照和相对湿度是影响城区O3浓度的主要气象因素,复杂地形下降水量和气压对O3浓度传输能力影响相对较弱。

The paper aims to study the distribution characteristics of O3 in Zunyi of Yun-Gui plateau and their relationships with meteorological conditions.We analyzed the data from environment monitoring stations and weather stations in Zunyi during 2014-2017.The results showed that:(1)the concentration of O3 in Zunyi fast exceeded the previous growth rate than before;(2)the concentration of O3 in Zunyi was higher in summer and autumn,and lower in spring and winter;the highest concentration of O3 was in May,the peak value of O3 was in November(52.71μg/m3),and the valley value was 26.18μg/m3;this was closely related to the long average sunshine and the high average temperature in summer and autumn;(3)the day variation curve of O3 concentration in Zunyi showed a single peak distribution,the concentration at daytime was obviously higher than that at night,and the peak value generally appeared at about 16:00;(4)urban air pollution mainly came from local emissions,and chemical transformation,solar radiation,air temperature,wind speed,sunshine and relative humidity were the main meteorological factors affecting the concentration of O3 in urban area,and the influence of the precipitation amount in complex terrain and air pressure on the transport capacity of O3 concentration were relatively weak.