1. Department of Earth Sciences, ETH Zürich, 8092 Zürich, Switzerland
2. Woods Hole Oceanographic Institution, 360 Woods Hole Road, Falmouth, MA 02543, USA
3. MIT-WHOI Joint Program in Oceanography/Applied Ocean Science and Engineering, Cambridge and Woods Hole, MA, USA
4. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA
5. Department of Earth Sciences, ETH Zürich, 8093 Zürich, Switzerland