1. Karlsruhe Institute of Technology (KIT) Institute of Meteorology and Climate Research Karlsruhe Germany
2. Karlsruhe Institute of Technology (KIT) Institute of Photogrammetry and Remote Sensing Karlsruhe Germany
3. Cooperative Institute for Research in Environmental Sciences (CIRES) University of Colorado Boulder CO USA
4. Physical Science Laboratory National Oceanic and Atmospheric Administration Boulder CO USA