Abstract:Abstract. Using a multistep nitrite-coated filter-pack system for sampling, we determined the seasonal variations in the triple oxygen isotopic composition (Δ17O) of tropospheric ozone (O3) in the terminal positions (Δ17Oterm(O3)) in the cities Nagoya and Niigata (Japan) in the eastern Asia region to quantify the mixing ratio of stratospheric O3 within the total tropospheric O3 supplied by stratosphere–troposphere transport (STT). In Nagoya, diurnal variations have also been studied. Both the average Δ17Oterm(… Show more
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