摘要
利用2018—2021年浙江省臭氧监测数据对ERA5臭氧再分析资料的适用性进行初步评估,结果显示其在4—9月晴天条件下的适用性较好,在此基础上研究了4—9月宁波市臭氧浓度水平和垂直分布特征,为臭氧预报准确率提高和污染精准防控提供理论依据。结果表明,1000 hPa华东地区及海上臭氧质量混合比呈北高南低。4—5月、9月宁波北部地区东北风和南部地区偏东风均利于海上高浓度臭氧向陆地传输。垂直方向上臭氧浓度基本从低层向高层递增,各层纬向分布相对平稳,100μg/kg分界线保持在500~600 hPa,经向分布呈现北高南低,越往低层差异越明显,6—7月27~31.5°N臭氧质量混合比相差最大有14μg/kg左右。大尺度下沉气流的天气形势均利于臭氧向下传输,其作用效果是夏季台风外围下沉气流>春季脊区>夏季副热带高压,平流层向对流层输送现象易造成近地面臭氧污染。
A preliminarily assessment on the applicability of ERA5 reanalysis data of ozone was carried out by using the ozone data observed from 2018 to 2021 in Zhejiang.The results showed that the ERA5 ozone reanalysis data had good applicability under sunny days from April to September.On this basis,the horizontal and vertical distribution characteristics of ozone concentration in Ningbo from April to September were studied,so as to provide a theoretical basis for improving the accuracy of ozone forecasting and precise pollution prevention and control.The mass mixing ratio of ozone at 1000 hPa in East China and the sea is greater in the north and less in the south.From April to May and in September,the northeast wind in the north of Ningbo and the east wind in the south of Ningbo were conducive to the transmission of high-concentration ozone from the sea to the land.The latitudinal distribution of ozone concentration was relatively stable,and the boundary of 100μg/kg was maintained at 500-600 hPa.The latitudinal distribution was greater in the north than in the south,and the difference was more obvious in the lower altitudes.The maximum difference of ozone mass mixing ratio was about 14μg/kg from June to July.The weather conditions of large-scale downdraft are conducive to ozone transmission,and the effect is as follows:downdraft outside typhoon in summer>ridge area in spring>subtropical high in summer.The ground-level ozone pollution is easily caused by transport from stratosphere to troposphere.
作者
徐璐
胡晓
许岳庭
胡波
郑艳
XU Lu;HU Xiao;XU Yue-ting;HU Bo;ZHENG Yan(Meteorological Bureau of Zhenhai District,Ningbo,Ningbo,Zhejiang 315202,China;Meteorological Bureau of Haishu District,Ningbo,Ningbo,Zhejiang 315194,China;Ningbo Meteorological Bureau,Ningbo,Zhejiang 315012,China)
出处
《四川环境》
2025年第2期36-45,共10页
Sichuan Environment
基金
宁波市自然科学基金项目(2023J235)
宁波市气象科技计划重点项目(NBQX2023004A)
宁波市气象科技计划项目(NBQX2022006B)。
