Tobias Walter Höfig, Texas A&M University College Station, College Station, TX, United States, Chao Zhang, Leibniz University of Hannover, Hannover, Germany, David William Peate, University of Iowa, Iowa City, IA, United States, Susan E Humphris, WHOI, Woods Hole, MA, United States and Lawrence K. S. Horkley, University of Iowa, Earth and Environmental Science, Iowa City, IA, United States