A new TROPOMI product for tropospheric NO 2 columns over East Asia with explicit aerosol corrections

Liu, Mengyao; Lin, Jintai; Kong, Hao; Boersma, K. Folkert; Eskes, Henk; Kanaya, Yugo; He, Qin; Tian, Xin; Qin, Kai; Xie, Pinhua; Spurr, Robert; Ni, Ruijing; Yan, Yingying; Weng, Hongjian; Wang, Jingxu

We present a new product with explicit aerosol corrections, POMINO-TROPOMI, for tropospheric nitrogen dioxide (inline-formulaNO2) 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 (inline-formulaR2=0.75; inline-formulaNMB=0.8 % versus inline-formulaR2=0.68, inline-formula M7inlinescrollmathml normal NMB = - normal 41.9 68pt10ptsvg-formulamathimg0ddb11499c6a5512ae3c795e600a84e6 amt-13-4247-2020-ie00001.svg68pt10ptamt-13-4247-2020-ie00001.png  %). Sensitivity tests suggest that implicit aerosol corrections, as in TM5-MP-DOMINO, lead to underestimations of inline-formulaNO2 columns by about 25 % over the polluted northern East China region. Reducing the horizontal resolution of a priori inline-formulaNO2 profiles would underestimate the retrieved inline-formulaNO2 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 inline-formulaNO2 profiles is more important under calm conditions.

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Liu, Mengyao / Lin, Jintai / Kong, Hao / et al: A new TROPOMI product for tropospheric NO2 columns over East Asia with explicit aerosol corrections. 2020. Copernicus Publications.

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