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Abstract

During Aug. 1st - Aug. 29th, 2022, 8 ozonesondes were successfully launched at Pengjia Islet, Taiwan (122°04’17” E, 25°37’46” N) to measure vertical ozone profiles up to 35 km. An ozone DIAL lidar was operated at Academia Sinica in Taipei City, Taiwan (25.040°N, 121.614°E, about 80 km southwest of Pengjia Islet) to continuously measure ozone profile up to 12 km. Ozonesondes launched by the CWB, Taiwan during 1992-2011 are also presented for comparison. The lowest ozone concentration usually occurred around cold point tropopause around 17.5km. The ozone concentration observed in Aug. 2022 in general was in the range of ozone observed during 1992-2011. Ｎo significant ozone abundance is observed in the UT/LS region. On Aug. 1st and 12th, significant low ozone episodes (about 0.5mPa and 0.8mPa) were found at 10km-16km and 9km-12km, respectively. These two ozone deficiencies might be owing to ozone quenching processes and HYSPLIT back-trajectory analysis indicated the air parcels passed northeast of the Philippines on 7/31 and south of Japan on 8/10, respectively. On the other hand, several weak ozone abundant/deficient episodes were noticed in ozonesonde and ozone DIAL measurements in the UTLS and the low troposphere regions. Ozone concentrations are also noticed to tend to be weakly negatively correlated with RH. HYSPLIT analysis shows most of the air parcels' back-trajectory near the south of Japan or northeast of the Philippines.