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List of Abstracts 82induced transport and precipitation changes and their implications for atmospheric pollutant distributions. Inthe future climate, convective mass flux out of the boundary layer weakens (-13%), reducing the freetropospheric COt and increasing surface COt. This finding supports prior emphasis on the need for tighteremission regulations to achieve a desired air quality improvement as climate warms. Meanwhile, convectiondeepens, increasing COt near the tropopause. Stronger stratospheric-tropospheric air mass exchange (+30%)increases the pollutants in the lower stratosphere. These changes in vertical transport largely control thepollutant redistribution (the large scale overturning circulation changes little with