Articles | Volume 14, issue 1
Atmos. Meas. Tech., 14, 615–646, 2021
https://doi.org/10.5194/amt-14-615-2021
Atmos. Meas. Tech., 14, 615–646, 2021
https://doi.org/10.5194/amt-14-615-2021

Research article 28 Jan 2021

Research article | 28 Jan 2021

Assessment of the TROPOMI tropospheric NO2 product based on airborne APEX observations

Frederik Tack et al.

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We assess the TROPOMI tropospheric NO2 product (OFFL v1.03.01; 3.5 km × 7 km at nadir observations) based on coinciding airborne APEX reference observations (~75 m × 120 m), acquired over polluted regions in Belgium. The TROPOMI NO2 product meets the mission requirements in terms of precision and accuracy. However, we show that TROPOMI is biased low over polluted areas, mainly due to the limited spatial resolution of a priori input for the AMF computation.