Anna Rose Waldeck¹, Adina Paytan², Thomas Laakso¹, Francis Macdonald³ and David T Johnston⁴, (1)Harvard University, Cambridge, MA, United States, (2)UCSC-Inst Marine Sciences, Santa Cruz, CA, United States, (3)University of California, Santa Barbara, Santa Barbara, United States, (4)Harvard-Earth & Planet Science, Cambridge, MA, United States