journal · 2020
A new TROPOMI product for tropospheric NO2 columns over East Asia with explicit aerosol corrections
Atmospheric Measurement Techniques, 13, 4247-4259
@article{liu2020atmospheric,
author = {Liu, M.-Y., Lin, J.-T., Kong, H., Boersma, K. F., Eskes, H., Kanaya, Y., He, Q., Tian, X., Qin, K., Xie, P., Spurr, R., Ni, R.-J., Yan, Y.-Y., Weng, H.-J., and Wang, J.-X.},
title = {A new TROPOMI product for tropospheric NO2 columns over East Asia with explicit aerosol corrections},
journal = {Atmospheric Measurement Techniques},
volume = {13},
pages = {4247-4259},
year = {2020},
doi = {10.5194/amt-13-4247-2020}
}Abstract
We present a new product with explicit aerosol corrections, POMINO-TROPOMI, for tropospheric nitrogen dioxide ( NO 2 ) vertical column densities (VCDs) over East Asia, based on the newly launched TROPOspheric Monitoring Instrument with an unprecedented high horizontal resolution. Compared to the official TM5-MP-DOMINO (OFFLINE) product, POMINO-TROPOMI shows stronger concentration gradients near emission source locations and better agrees with MAX-DOAS measurements ( R 2 =0.75; NMB=0.8 % versus R 2 =0.68, NMB = - 41.9 %). Sensitivity tests suggest that implicit aerosol corrections, as in TM5-MP-DOMINO, lead to underestimations of NO 2 columns by about 25 % over the polluted northern East China region. Reducing the horizontal resolution of a priori NO 2 profiles would underestimate the retrieved NO 2 columns over isolated city clusters in western China by 35 % but with overestimates of more than 50 % over many offshore coastal areas. The effect of a priori NO 2 profiles is more important under calm conditions.