Dipole‐Like Responses in Near‐Surface Ozone Induced by Mid‐Latitude Cut‐Off Lows Over East Asia: A 40‐Year Simulated Climatology

Midlatitude cut‐off lows (COLs) strongly influence weather, climate, and regional ozone (O 3 ) variability, yet their seasonal impacts on near‐surface O 3 and underlying mechanisms remain inadequately understood. A 40‐year climatological analysis reveals a dipole‐like pattern in COL‐induced near‐surface O 3 changes, most evident during spring and summer, featuring positive anomalies in the south and negative anomalies near the center. Specifically, spring O 3 responses arise from a co‐regulated mechanism in which suppressed tropospheric photochemistry reduces central O 3 levels, while intensified stratospheric intrusion enhances O 3 in southern regions. Differently, the summer dipole is primarily shaped by spatially differentiated tropospheric processes, with central inhibited and southern promoted photochemistry. Horizontal redistribution further reinforces the dipole structure by cyclonically transporting O 3 from the western to the eastern sectors. These multi‐process synergistic responses highlight the complexity of atmospheric environmental perturbations under synoptic‐scale forcing and provide insights for addressing the compound risks of extreme weather and air‐quality degradation.