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In situ measurements of the vertical structure of ozone were made in Changchun (43.53°N, 125.13°E), China in the summers of 2010-13. Analysis of the 89 validated ozone profiles shows the variation of ozone concentration in the upper troposphere and lower stratosphere (UTLS) caused by cut-off lows (COLs). During the COL events, an increase of the ozone concentration and a lower height of the tropopause are observed. [Source: Advances in Atmospheric Sciences]
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