1. Institute of Meteorology and Climate Research-Department Troposphere Research (IMK-TRO); Karlsruhe Institute of Technology; Karlsruhe Germany
2. Centre for Environmental and Climate Research; Lund University; Lund Sweden
3. Institute for Atmospheric and Climate Science; ETH Zurich; Zurich Switzerland
4. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research; Division, Climate Science-Paleoclimate Dynamics; Bremerhaven Germany
5. Institute of Meteorology and Climate Research-Department Atmospheric Trace Gases and Remote Sensing (IMK-ASF); Karlsruhe Institute of Technology; Karlsruhe Germany