武汉市臭氧时空分布及环境变量影响分析

Analysis of the temporal and spatial distribution of ozone and the influence of environmental variables in Wuhan

武汉是武汉城市群的核心城市,随着经济和城市化快速推进,臭氧污染日趋加重.为探究武汉市臭氧浓度时空分布及影响因素,以该市21个环境监测站点2016年至2018年臭氧观测数据及环境协变量数据为基础,使用时空地理加权回归模型和反距离权重插值法,对该区域臭氧浓度时空变化及其环境影响因素进行了分析.结果表明,武汉市夏半年臭氧平均浓度高于冬半年,而且6月和9月出现两个峰值,年变化呈“M”型;武汉市主城区臭氧浓度普遍低于远城区,并且逐渐形成远城区浓度高主城区浓度低的环状包围结构;气温、边界层高度、总云量、地表压强与臭氧分布有较强影响,因为环境变量的周期性变化导致臭氧浓度亦表现出年际周期性.夏季是武汉臭氧污染高发期,更应加强监管注意防护,尤其是远城区浓度高且污染高发区.

Wuhan is the core city of Wuhan city cluster.With the rapid development of economy and urbanization,ozone pollution is becoming increasingly serious.To explore the time and space distribution characteristics and influencing factors of ozone concentration in Wuhan City,based on the observation data of ozone from 21 environmental monitoring sites in Wuhan City from 2016 to 2018,using space-time geographically weighted regression model and inverse distance weighted interpolation method of ozone concentration changes of time and space in Wuhan City is analyzed,and the analysis of the effect of environmental factors on the time and space distribution.The results showed that the average ozone concentration in half a year in summer was about twice that in half a year in winter,and there were two peaks in June and September,and the annual variation was M type.The ozone concentration in the main urban area of Wuhan was generally lower than that in the far urban area.Air temperature,boundary layer height,total cloud cover,surface pressure and ozone distribution had a strong influence,because the periodic change of environmental variables lead to the annual periodicity of ozone concentration.Summer was a high incidence period of ozone pollution in Wuhan,so more attention should be paid to supervision and protection,especially in the far urban areas with high concentration and high pollution incidence.