Articles | Volume 11, issue 7
https://doi.org/10.5194/amt-11-4509-2018
https://doi.org/10.5194/amt-11-4509-2018
Research article
 | 
27 Jul 2018
Research article |  | 27 Jul 2018

The importance of surface reflectance anisotropy for cloud and NO2 retrievals from GOME-2 and OMI

Alba Lorente, K. Folkert Boersma, Piet Stammes, L. Gijsbert Tilstra, Andreas Richter, Huan Yu, Said Kharbouche, and Jan-Peter Muller

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AR: Author's response | RR: Referee report | ED: Editor decision
AR by Alba Lorente on behalf of the Authors (11 May 2018)  Author's response   Manuscript 
ED: Referee Nomination & Report Request started (28 May 2018) by Michel Van Roozendael
RR by Anonymous Referee #1 (13 Jun 2018)
ED: Publish subject to minor revisions (review by editor) (13 Jun 2018) by Michel Van Roozendael
AR by Alba Lorente on behalf of the Authors (19 Jun 2018)  Author's response   Manuscript 
ED: Publish as is (13 Jul 2018) by Michel Van Roozendael
AR by Alba Lorente on behalf of the Authors (13 Jul 2018)
Short summary
Light reflected by Earth’s surface is different in each direction: it appears brighter or darker in certain viewing directions. Currently this effect is not accounted for in satellite retrievals; thus surface reflectance climatologies and cloud fractions show an east-west bias across orbits (GOME2,OMI). The effect for NO2 measurements in partly cloudy scenes is substantial. We recommend that this effect in UV/Vis sensors coherently accounted for, and will be especially beneficial for TROPOMI.