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Analysis of the impact of convective transport of tropospheric pollution on the composition of the upper troposphere and lower stratosphere (UTLS)

Recent modelling and measurement studies have shown that convective transport in the Asian monsoon region can provide a significant source of CO to the lower stratosphere. Correlations between species such as CO and O3 are useful diagnostics of stratosphere-troposphere exchange in the extratropical UTLS. We are using correlations between satellite observations of CO and O3 and assimilated data products to quantify stratosphere-troposphere exchange in the UTLS and to better constrain the influence of pollution from convective regions such as Asia on the composition of the UTLS region.