2016—2020年武汉各行政区臭氧浓度的时空分布规律

Spatiotemporal distribution of ozone concentration in different districts of Wuhan during 2016-2020

基于中国环境监测总站和武汉市环保局的污染物小时均值数据,统计武汉市22个监测点臭氧浓度,分析臭氧浓度及污染状况的时空分布状况,结果表明:2016—2020年武汉地区臭氧浓度具有明显的时间变化规律,年际变化呈现上升的趋势;在年内变化上呈现冬季低、夏季高的特点;在臭氧浓度月均值变化中多呈现不规则的“M”状双峰型变化趋势,少数呈倒“V”状的单峰型,还有极少数的多峰型;臭氧浓度空间分布规律为从市中心到远城区依次降低.出现空间异质性是主城区臭氧前体污染物排放源集中,再加上夏季城市的热岛效应,增加了臭氧的浓度.

Based on the hourly mean value data of pollutants from China Environmental Monitoring Station and Wuhan Environmental Protection Bureau,the ozone concentration of 22 monitoring sites in Wuhan was analyzed,and the spatial and temporal distribution of ozone concentration and pollution status was analyzed.The results were as follows,during the study period,the annual variation of ozone concentration in Wuhan showed an upward trend.The seasonal variation of the year was low in winter and high in summer.Most of the monthly mean ozone concentration showed irregular“M”double-peak pattern,a few showed inverted“V”single-peak pattern,and a few showed multi-peak pattern.The spatial distribution of ozone concentration decreased from the downtown to the far urban area.The emergence of spatial heterogeneity was due to the concentration of ozone precursor pollutant emission sources in the main urban areas,coupled with the urban heat island effect in summer,increasing the concentration of ozone.