Stratospheric influence on surface ozone pollution in China.

ABSTRACT: Events of stratospheric intrusions to the surface (SITS) can lead to severe ozone (O₃) pollution. Still, to what extent SITS events impact surface O₃ on a national scale over years remains a long-lasting question, mainly due to difficulty of resolving three key SITS metrics: frequency, duration and intensity. Here, we identify 27,616 SITS events over China during 2015-2022 based on spatiotemporally dense surface measurements of O₃ and carbon monoxide, two effective indicators of SITS. An overview of the three metrics is presented, illustrating large influences of SITS on surface O₃ in China. We find that SITS events occur preferentially in high-elevation regions, while those in plain regions are more intense. SITS enhances surface O₃ b

SUBMITTER: Chen Z 

PROVIDER: S-EPMC11093980 | biostudies-literature | 2024 May

REPOSITORIES: biostudies-literature