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The FRESCO (Fast Retrieval Scheme for Clouds from the Oxygen A-band)algorithm has been used to retrieve cloud information from measurementsof the O2 A-band around 760 nm by GOME, SCIAMACHY and GOME-2.The cloud parameters retrieved by FRESCO are the effective cloudfraction and cloud pressure, which are used for cloud correction inthe retrieval of trace gases like O3 and NO2.To improve the cloud pressure retrieval for partly cloudy scenes,single Rayleigh scattering has been included in an improved version ofthe algorithm, called FRESCO+. We compared FRESCO+ and FRESCO effectivecloud fractions and cloud pressures using simulated spectra andone month of GOME measured spectra. As expected, FRESCO+ gives morereliable cloud pressures over partly cloudy pixels. Simulations andcomparisons with ground-based radar/lidar measurements of clouds showthat the FRESCO+ cloud pressure is about the optical midlevel of thecloud. Globally averaged, the FRESCO+ cloud pressure is about 50 hPahigher than the FRESCO cloud pressure, while the FRESCO+ effectivecloud fraction is about 0.01 larger. The effect of FRESCO+ cloud parameters on O3 and NO2vertical column density (VCD) retrievals is studied using SCIAMACHY dataand ground-based DOAS measurements. We find that the FRESCO+algorithm has a significant effect on tropospheric NO2 retrievals but a minor effect on total O3 retrievals.The retrieved SCIAMACHY tropospheric NO2 VCDsusing FRESCO+ cloud parameters (v1.1) are lower than the troposphericNO2VCDs which used FRESCO cloud parameters (v1.04), in particularover heavily polluted areas with low clouds. The difference betweenSCIAMACHY tropospheric NO2 VCDs v1.1 and ground-based MAXDOASmeasurements performed in Cabauw, The Netherlands,during the DANDELIONS campaign is about−2.12×1014molec cm−2

FRESCO+: an improved O&lt;sub&gt;2&lt;/sub&gt; A-band cloud retrieval algorithm for tropospheric trace gas retrievals

FRESCO+: an improved O<sub>2</sub> A-band cloud retrieval algorithm for tropospheric trace gas retrievals