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ArticleGlobal reorganization of deep-sea circulation and carbon storage after the last ice age(American Association for the Advancement of Science, 2022-11-16) Rafter, Patrick A. ; Gray, William R. ; Hines, Sophia K. V. ; Burke, Andrea ; Costa, Kassandra M. ; Gottschalk, Julia ; Hain, Mathis P. ; Rae, James W. B. ; Southon, John R. ; Walczak, Maureen H. ; Yu, Jimin ; Adkins, Jess F. ; DeVries, TimothyUsing new and published marine fossil radiocarbon (C/C) measurements, a tracer uniquely sensitive to circulation and air-sea gas exchange, we establish several benchmarks for Atlantic, Southern, and Pacific deep-sea circulation and ventilation since the last ice age. We find the most C-depleted water in glacial Pacific bottom depths, rather than the mid-depths as they are today, which is best explained by a slowdown in glacial deep-sea overturning in addition to a "flipped" glacial Pacific overturning configuration. These observations cannot be produced by changes in air-sea gas exchange alone, and they underscore the major role for changes in the overturning circulation for glacial deep-sea carbon storage in the vast Pacific abyss and the concomitant drawdown of atmospheric CO.