Jennifer Necker, Woods Hole Oceanographic Institution, Marine Chemistry and Geochemistry, Woods Hole, United States, Eric Ryberg, University of Connecticut, Allied Health Services, Groton, United States, Mary McGrory, University of Pittsburgh, Geology and Environmental Science, Pittsburgh, United States, Elizabeth Swanner, Iowa State University, Geological and Atmospheric Sciences, Ames, United States and Colleen Hansel, Woods Hole Oceanographic Institution, Marine Chemistry & Geochemistry, Woods Hole, United States