Abstract
<p>We compare tropospheric nitrogen dioxide (NO<sub>2</sub>) in the United Kingdom Chemistry and Aerosol (UKCA) model v11.0 with satellite measurements from NASA Earth Observing System (EOS) Aura satellite Ozone Monitoring Instrument (OMI) troposphere NO<sub>2</sub> data over South and East Asia (S/A). UKCA is the atmospheric composition component of the UK Earth System Model (UKESM). UKCA has been run on ARCHER (UK National Supercomputing Service) with (a) nudged hourly outputs over S/A as well as monthly outputs globally and (b) free run monthly globally output for 2005-2015. OMI satellite Averaging Kernels (AK) has been applied on the model hourly outputs for accurate model satellite comparison for 2005 - 2015. OMI and UKCA data has been analysed spatially and temporally. Background UKCA and OMI tropospheric column NO<sub>2</sub> typically ranges between 0-3 x 10<sup>15</sup> molecules/cm<sup>2</sup>. Model is overestimating tropospheric NO<sub>2</sub> over the S/A predominantly during winter by a factor of ~2.5. </p>
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