Global reorganization of deep-sea circulation and carbon storage after the last ice age
Rafter, P.A.; Gray, W.R.; Hines, S.K.V.; Burke, A.; Costa, K.M.; Gottschalk, J.; Hain, M.P.; Rae, J.W.B.; Southon, J.R.; Walczak, M.H.; Yu, J.; Adkins, J.F.; DeVries, T. (2022). Global reorganization of deep-sea circulation and carbon storage after the last ice age. Science Advances 8(46). https://dx.doi.org/10.1126/sciadv.abq5434
In: Science Advances. AAAS: New York. ISSN 2375-2548; e-ISSN 2375-2548, more
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| Authors | | Top |
- Rafter, P.A.
- Gray, W.R.
- Hines, S.K.V.
- Burke, A.
- Costa, K.M.
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- Gottschalk, J.
- Hain, M.P.
- Rae, J.W.B.
- Southon, J.R.
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- Walczak, M.H.
- Yu, J.
- Adkins, J.F.
- DeVries, T.
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| Abstract |
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. |
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