Alyson Santoro¹, Justine Albers², Colleen A Durkin³, Matthieu Bressac⁴, Margaret L Estapa⁵, Ken Buesseler⁶, Melissa Omand⁷, Uta Passow² and Philip W. Boyd⁸, (1)University of California Santa Barbara, Santa Barbara, United States, (2)University of California Santa Barbara, Santa Barbara, CA, United States, (3)Moss Landing Marine Laboratories, Moss Landing, CA, United States, (4)University of Tasmania, Institute for Marine and Antarctic Studies, Ecology and Biodiversity, Hobart, TAS, Australia, (5)Skidmore College, Saratoga Springs, NY, United States, (6)Woods Hole Oceanographic Institution, Department of Marine Chemistry and Geochemistry, Woods Hole, MA, United States, (7)University of Rhode Island, Graduate School of Oceanography, Narragansett, RI, United States, (8)Univ Otago, Dunedin, New Zealand