1. Rice University, Department of Earth, Environmental, and Planetary Sciences, Houston, TX 77005, USA.
2. School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA.
3. Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, USA.
4. Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY 14853, USA.
5. Department of Earth Sciences, University of Minnesota, Minneapolis, MN 55455, USA.
6. Institute of Global Environmental Change, Xi’an Jiaotong University, Xi’an 710054, China.
7. Scripps Institution of Oceanography, San Diego, CA 92037, USA.