[Characteristics of Ozone Concentration in Shanghai and Its Associated Atmospheric Circulation Background During Summer Half-years from 2006 to 2021].

It is of great importance to scientifically evaluate the impact of weather and climate conditions on the occurrence of O pollution in order to improve the accuracy of O pollution forecasts， as well as to reasonably control and reduce the adverse effects of O pollution. The characteristics of O concentration and climate background were analyzed based on daily O concentration data， meteorological factors， and NCEP/NCER reanalysis data from 2006 to 2021 in Shanghai. In addition， the differences in atmospheric circulation situations during years with anomalous O concentrations were compared and diagnosed from the perspective of climatology.