Deborah K Smith¹, Hans Schouten², Emily M Klein³, Benjamin W Wernette³, Ross Parnell-Turner⁴, Johnson R Cann⁵ and Tingting Zheng⁶, (1)National Science Foundation, Alexandria, VA, United States, (2)Woods Hole Oceanographic Institution, Woods Hole, MA, United States, (3)Duke University, Durham, NC, United States, (4)Scripps Institution of Oceanography, La Jolla, United States, (5)University of Leeds, Leeds, United Kingdom, (6)State Key Laboratory of Marine Geology, School of Ocean and Earth Science, Tongji University, Shanghai, China