Jennifer Necker, Eckerd College, St. Petersburg, FL, United States, Veronique Oldham, University of Rhode Island, Graduate School of Oceanography, Kingston, RI, United States; Woods Hole Oceanographic Institution, Department of Marine Chemistry and Geochemistry, Woods Hole, MA, United States, Scott D. Wankel, Woods Hole Oceanographic Institution, Marine Chemistry & Geochemistry, Woods Hole, MA, United States and Colleen Hansel, Woods Hole Oceanographic Institution, Woods Hole, MA, United States