Wenyuan Fan, Florida State University, Tallahassee, FL, United States, Jeffrey Joseph McGuire, US Geological Survey, Menlo Park, CA, United States, Catherine D de Groot-Hedlin, University of California San Diego, La Jolla, CA, United States, Michael A H Hedlin, University of California, La Jolla, CA, United States, Sloan Coats, Woods Hole Oceanographic Institution, Woods Hole, MA, United States and Julia W Fiedler, University of Calif San Diego, San Diego, CA, United States