1. Department of Atmospheric and Oceanic Sciences and the Institute for Geophysics and Planetary Physics; University of California; Los Angeles; California; USA
2. Atmospheric and Oceanic Sciences; Princeton University; Princeton; New Jersey; USA
3. Marine Chemistry and Geochemistry; Woods Hole Oceanographic Institution; Woods Hole; Massachusetts; USA
4. Department of Earth, Atmosphere, and Planetary Sciences; Massachusetts Institute of Technology; Cambridge; Massachusetts; USA
5. Climate and Environmental Physics, Physics Institute; University of Bern; Bern; Switzerland
6. Climate and Global Dynamics; National Center for Atmospheric Research; Boulder; Colorado; USA
7. Estimating the Circulation and Climate of the Ocean (ECCO); Jet Propulsion Laboratory; Pasadena; California; USA
8. Astrophysics and Geophysics Institute; University of Liege; Liege; Belgium