Das Projekt "Bodengestuetzte Fernerkundung der Stratosphaere bei SoendreStroemfjord, Groenland" wird vom Umweltbundesamt gefördert und von Max-Planck-Institut für Chemie (Otto-Hahn-Institut) durchgeführt. An intensive field study of the winterly arctic stratosphere is proposed to begin in the early fall 1994 and lasting until spring 1995. The aim is to evaluate processes which are responsible for the intensified Ozone destruction recently observed in the north hemisphere stratosphere. For achieving these objectives the composition and the dynamics of the stratosphere will be followed by a series of groundbased remote sensing instruments provided and operated by an international team of scientists. Vertical columns of stratospheric 03, NO2, OC10 and BrO are determined with high quality DOAS in the ultraviolet and visible spectral region (MPI). The frequent lee waves and associated PSC s will be followed by a combined RADAR and LIDAR. The RADAR can detect the three-dimensional wind vector and the LIDAR provides aerosol and temperature profiles (SRI). A balloon facility will be installed at Sondre Stromfjord for the launch of backscatter/ozone sondes (University Wyoming/DMI). The Colorado State University Regional Atmospheric Model is available at DMI and will be used for the simulation of orographic force waves (DMI). A chemical box-model which includes radiation will be used to model the diurnal profiles of the stratospheric species (MPI). The joint study of the MPI fuer Chemie, the Danish Meteorological Institute, Stanford Research International and the University of Wyoming will address the questions: 1) What are the mechanisms causing OCLO to appear early in the winter? 2) Can polar stratospheric clouds be observed during lee wave activity and what is the impact on the production of activated chlorine? 3) Is the ozone decline in the arctic vortex connected to an increase in activated chlorine and what is the role of the Pinatubo aerosol? 4) What is the behaviour of the ozone compared to the years before? The evaluated data will be stored in the NILU data base.