1. Helmholtz Centre Potsdam German Research Centre for Geosciences – GFZ, Telegrafenberg, 14473 Potsdam, Germany, gesap@gfz-potsdam.de, simone.cesca@gfz-potsdam.de
2. Also at Institute for Geosciences, University of Potsdam, Potsdam, Germany.
3. Institute for Geosciences, University of Potsdam, Karl‐Liebknecht‐Straße 24‐25, 14476 Potsdam, Germany, kriegero@uni-potsdam.de