Influence of Weather Types on Summer Ozone Pollution Process in Tianjin
Based on the pollutant monitoring data and meteorological data of Tianjin in summer 2022,the O3 pollution status was discussed.The subjective weather classification method was used to classify and compare the weather types in the same period,and the influence of weather types on O3 concentration was analyzed.The characteristics and variations of O3 pollution under major weather types were explored by using the backward trajectory tracking method.The results showed that O3 pollution was prone to occur in Tianjin when the surface was controlled by low pressure system and the high altitude was affected by southwest and south airflow.The temperature was high and the wind was low under this weather type.When moisture absorption growth of particulate matter,synergistic pollution of O3 and PM2.5 would caused by external transport and local generation.When the surface was controlled by pressure balanced system and the high altitude was affected by convergent airflow,the high concentrations of O3 and PM2.5 were low and the duration of the pollution process was short due to the pollution was mainly generated locally.High concentrations of O3 was not easy to appear when the surface was controlled by high pressure system and the high altitude was affected by north airflow.Under the premise of relatively stable pollution emission,the change of weather types was the main reason affected the O3 concentration.
NETL
NSTL
万方数据
