STUDY OF THE TROPOSPHERIC AEROSOL AT THE JUNGFRAUJOCH ALPINE STATION BY MEAN OF SIMULTANEOUS LIDAR AND IN-SITU MEASUREMENTS

The Jungfraujoch High Alpine Station is a unique site for atmospheric observation, located at an altitude of 3'580 m and most of the time in the free troposphere. It is equipped with instruments that have for decades performed important Global Climate Observations. The EPFL lidar group recently has installed a lidar system. With an emitter based on three wavelengths (355 nm, 532 nm and 1064 nm) and a dual telescope receiver, the aerosol extinction and backscatter properties at these three wavelengths can be retrieved for altitudes between typically 4 km and 60 km asl. The Paul Scherrer Institute performs simultaneously various in-situ aerosol measurements at the Jungfraujoch, among others particle size distribution, (back)scattering coefficients at three wavelengths (450 nm, 550 nm and 700 nm) and black carbon concentration. The latter two are operated continuously within the World Meteorological Organisation's Global Atmosphere Watch (GAW) Program.