1. Geological Institute; Department of Earth Sciences, ETH Zurich; Zurich; Switzerland
2. Department of Earth and Planetary Science; University of California at Berkeley; Berkeley; California; USA
3. Department of Geosciences; Princeton University; Princeton; New Jersey; USA
4. Lamont-Doherty Earth Observatory; Columbia University; Palisades; New York; USA
5. Geophysical Fluid Dynamics Laboratory; National Oceanic and Atmospheric Administration; Princeton; New Jersey; USA