Maria Rosabelle Ong, American Museum of Natural History, Earth and Planetary Sciences, New York, United States; Lamont-Doherty Earth Observatory, Columbia University, Palisades, United States, Nathalie Goodkin, American Museum of Natural History, Earth and Planetary Sciences, New York, NY, United States, Reia Guppy, The University of Trinidad and Tobago, Centre for Maritime and Ocean Studies, Chaguaramas, Trinidad and Tobago, Hsun-Ming Hu, AORI University of Tokyo, Kashiwa, Japan; National Taiwan University, Taipei, Taiwan, Chuan-Chou Shen, National Taiwan University, High‐precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geosciences, Taipei, Taiwan and Konrad A Hughen, Woods Hole Oceanographic Institution, Woods Hole, United States