Summary This PhD thesis is embedded into the Arctic Study of Tropospheric Aerosol, Clouds and

• Main Authors: Johannes Gutenberg-universität Mainz, Doktor Der Naturwissenschaften
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Arctic; Svalbard
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.633.7212; http://ubm.opus.hbz-nrw.de/volltexte/2009/2001/pdf/diss.pdf

Radiation (ASTAR) and investigates the radiative transfer through Arctic boundary-layer mixed-phase (ABM) clouds. For this purpose airborne spectral solar radiation measure-ments and simulations of the solar and thermal infrared radiative transfer have been performed. This work reports on measurements with the Spectral Modular Airborne Radiation measurement sysTem (SMART-Albedometer) conducted in the framework of ASTAR in April 2007 close to Svalbard. For ASTAR the SMART-Albedometer was ex-tended to measure spectral radiance. The development and calibration of the radiance measurements are described in this work. In combination with in situ measurements of cloud particle properties provided by the Laboratoire de Météorologie Physique (LaMP) and simultaneous airborne lidar measurements by the Alfred Wegener Institute for Po-lar and Marine Research (AWI) ABM clouds were sampled. The SMART-Albedometer measurements were used to retrieve the cloud thermodynamic phase by three different approaches. A comparison of these results with the in situ and lidar measurements is presented in two case studies. Beside the dominating mixed-phase clouds pure ice clouds were found in cloud gaps and at the edge of a large cloud field. Furthermore the verti-