Articles | Volume 15, issue 11
Research article
10 Jun 2022
Research article |  | 10 Jun 2022

Impact of 3D cloud structures on the atmospheric trace gas products from UV–Vis sounders – Part 3: Bias estimate using synthetic and observational data

Arve Kylling, Claudia Emde, Huan Yu, Michel van Roozendael, Kerstin Stebel, Ben Veihelmann, and Bernhard Mayer

Data sets

Comprehensive Large Array-data Stewardship System (CLASS) NOAA

Model code and software

libRadtran B. Mayer, C. Emde, J. Gasteiger, and A. Kylling

QDOAS T. Danckaert, C. Fayt, M. Van Roozendael, I. De Smedt, V. Letocart, A. Merlaud, and G. Pinardi

Short summary
Atmospheric trace gases such as nitrogen dioxide (NO2) may be measured by satellite instruments sensitive to solar ultraviolet–visible radiation reflected from Earth and its atmosphere. For a single pixel, clouds in neighbouring pixels may affect the radiation and hence the retrieved trace gas amount. We found that for a solar zenith angle less than about 40° this cloud-related NO2 bias is typically below 10 %, while for larger solar zenith angles the NO2 bias is on the order of tens of percent.