1. Earth and Oceanographic Science Department Bowdoin College Brunswick Maine USA
2. Earth and Planetary Sciences Department University of California Davis California USA
3. Department of Ocean Sciences University of California Santa Cruz California USA
4. Center for Acceleration Mass Spectrometry Lawrence Livermore National Laboratory Livermore California USA
5. Department of Geography Texas A&M University College Station Texas USA
6. Department of Earth System Science Stanford University Stanford California USA
7. Department of Marine Chemistry and Geochemistry Woods Hole Oceanographic Institution Woods Hole Massachusetts USA