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Two SCIAMACHY (SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY) O<sub>2</sub> A band cloud height products are evaluated usingground-based radar/lidar measurements between January 2003 and December 2011.The products are the ESA (European Space Agency) Level 2 (L2) version 5.02 cloud top height and theFRESCO (Fast Retrieval Scheme for Clouds from the Oxygen A band) version 6cloud height. The radar/lidar profiles are obtained at the Cloudnet sites ofCabauw and Lindenberg, and are averaged for 1 h centered at theSCIAMACHY overpass time. In total we have 217 cases of single-layer cloudsand 204 cases of multilayer clouds. We find that the ESA L2 cloud top heighthas a better agreement with the Cloudnet cloud top height than the Cloudnetcloud middle height. The ESA L2 cloud top height is on average 0.4 km higherthan the Cloudnet cloud top height, with a standard deviation of 3.1 km. TheFRESCO cloud height is closer to the Cloudnet cloud middle height than theCloudnet cloud top height. The mean difference between the FRESCO cloudheight and the Cloudnet cloud middle height is −0.1 km with a standarddeviation of 1.9 km. The ESA L2 cloud top height is higher than the FRESCOcloud height. The differences between the SCIAMACHY cloud (top) height andthe Cloudnet cloud top height are linked to cloud optical thickness. TheSCIAMACHY cloud height products are further compared to the Cloudnet cloudtop height and the Cloudnet cloud middle height in 1 km bins. For single-layer clouds, the difference between the ESA L2 cloud top height and theCloudnet cloud top height is less than 1 km for each cloud bin at 3–7 km.The difference between the FRESCO cloud height and the Cloudnet cloud middleheight is less than 1 km for each cloud bin at 0–6 km. The results aresimilar for multilayer clouds, but the percentage of cases having a biaswithin 1 km is smaller than for single-layer clouds. We may conclude thatthe FRESCO cloud height is accurate for low and middle level clouds, whereasthe ESA L2 cloud top height is more accurate for middle level clouds. Bothproducts are less accurate for high clouds

Evaluation of SCIAMACHY Oxygen A band cloud heights using Cloudnet measurements