An integrated analysis of ozone and carbon monoxide over the western Pacific using satellite and aircraft measurements during the ACCLIP summer campaign 2022

We analyze in situ observations of ozone (O 3 ) and carbon monoxide (CO) from 29 research flights—profiling over South Korea and cruising over the western Pacific —and balloon soundings in South Korea and Taiwan. In the upper troposphere (UT), a twofold enhancement in CO was observed across the mid‐latitudes of the western Pacific, driven by large‐scale uplift and outflow associated with the Asian Summer Monsoon (ASM) system.

Observational evidence of enhanced UT O 3 in conjunction with its primary precursor, nitrogen dioxide (NO 2 ), was also presented. Satellite observations from the TROPOspheric Monitoring Instrument (TROPOMI) and Microwave Limb Sounder (MLS) were integrated with two selected flight cases to explore transport events and to provide broader spatial context. On July 31, the ASM anticyclone manifested in two distinct modes, South Asia High (SAH) and Western Pacific High (WPH).