Tropical Tropospheric Ozone from GOME 2 and Extension to the Extra Tropics

Tropospheric ozone columns are retrieved using the convective cloud differential (CCD) method from GOME_2 as operational products within the O3M-SAF project. This algorithm is also adapted to other sensors like GOME or SCIAMACHY. The data from these three European satellites are combined to a long time series. However, the CCD method is limited to the tropics, therefore a different approach is used to extend the tropospheric ozone data to mid latitudes. Comparable to the OMI-MLS approach a GOME_2-MLS approach was tested, and showed promising results. A description of the new algorithm as well as a comparison with the well established CCD method will be presented. Ozone sondes are the standard tool for validating tropospheric ozone columns, here only a short comparison might be given.