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Abnormally low ozone (O 3 ) mixing ratios were observed by electrochemical concentration cell (ECC) ozonesondes in the upper troposphere over subtropical East Asia in spring 2004, a season when high tropospheric O 3 is usually observed in the region. Low O 3 with a lowest mixing ratio of 13ppbv, less than a fourth of the respective seasonal average of 60–100ppbv, was observed...
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