1. Department of Earth Sciences; ETH Zurich; Zurich Switzerland
2. Centre for Geobiology, University of Bergen; Bergen Norway
3. School of Oceanography, University of Washington; Seattle Washington USA
4. NOAA-PMEL, University of Washington; Seattle Washington USA
5. NOAA-PMEL; Newport Oregon USA
6. NOAA-PMEL; Seattle Washington USA
7. Now at Joint Institute for the Study of the Atmosphere and Ocean-PMEL, University of Washington; Seattle Washington USA