Global reorganization of deep-sea circulation and carbon storage after the last ice age.
Global reorganization of deep-sea circulation and carbon storage after the last ice age.
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DOI:
10.1126/sciadv.abq5434
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发表时间:
2022-11-18
期刊:
影响因子:
13.6
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中科院分区:
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Using new and published marine fossil radiocarbon (14C/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 14C-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 CO2. A compilation of radiocarbon measurements is used to characterize deep-sea overturning since the last ice age.
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