Role of the Tibetan Plateau Thermal Forcing in Shaping the Intra‐Seasonal Oscillation of Ozone Pollution in Eastern China

Abstract Meteorological changes exert a significant impact on ozone (O 3 ) pollution. However, as a key forcing driver on meteorological changes in downstream eastern China (EC), the Tibetan Plateau (TP) is seldom analyzed in connection with O 3 pollution over EC. In the present study, based on the observational O 3 and meteorological data over 2015–2021, the role of the TP thermal forcing in shaping the intra‐seasonal oscillation (ISO) of O 3 pollution in EC is investigated for the season of East Asian summer monsoon (EASM). The ISO of O 3 pollution during EASM is identified with the maximum daily 8‐hr averaged (MDA8) O 3 concentrations in a bimodal pattern in South China (SC), the middle and lower reaches of the Yangtze River (MLYR), and the North China Plain (NCP), and a unimodal pattern in northeastern China. The first O 3 peak in SC, MLYR, and NCP coincides with the northward advance of EASM, whereas the second peak occurs in reverse order with the southward retreat of EASM. The TP thermal forcing with the location and intensity shifts regulates the ISO of O 3 pollution through the impact on the advance and retreat of the EASM, which alters the regional cloud cover and downward solar radiation in EC, affecting the O 3 production change in the ISO of EASM. The simulation experiments of the global climate model CESM2 further verify the role of TP thermal forcing in shaping the ISO pattern of O 3 pollution in EC. This study revealing the TP's modulation on the ISO of O 3 pollution in EC provides a new perspective for understanding the environment and climate changes over the downstream region.