The Validation of SCIAMACHY Products by Ground-Based Millimeter-Wave Observation

SCIAMACHY measurements of ozone (O3), nitrous oxide (N2O), water vapour (H2O) and optional chlorine monoxide (ClO) shall be validated by profiles and columns derived from mm-wave radiometry at stations operating at high-, midand tropical latitudes (Fig.1). The University of Bremen and the Forschungszentrum Karlsruhe will carry out the project jointly with support by the Universidad de los Andes in Merida, Venezuela, for the tropical station. The University of Bremen is responsible for the maintenance and the operation of the high and mid-latitude stations. The high latitude station in Ny-Alesund, Spitsbergen is equipped with three radiometers to measure ozone, water vapour and chlorine monoxide. At the midlatitude station in Bremen, Germany, an ozone radiometer, also providing total columns of water vapour is operational since end of 2000 and presently in the validation phase. This latter instrument will be operated continuously during the time SCIAMACHY is in orbit. The Forschungszentrum Karlsruhe will install a well tested radiometer permitting to measure ozone, chlorine monoxide, nitrous oxide, nitric acid (HNO3), and tropospheric water vapour columns at the high altitude equatorial site in Merida, Venezuela. The University of Bremen will contribute a second frontend to observe stratospheric water vapour.