Constraining ventilation and non-ventilation contributions to global mean ocean-atmosphere radiocarbon offsets across the last deglaciation: implications for atmospheric CO and 14C budget closure
Radiocarbon serves as a tracer that provides unique insights into the ocean’s ability to sequester CO2 from the atmosphere. By applying a Bayesian interpolation method to compiled ocean-atmosphere radiocarbon age offsets (B-Atm), we provide global data fields and mean ocean B-Atm estimates for a sui...
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ftawi:oai:epic.awi.de:57127 2023-11-12T04:22:23+01:00 Constraining ventilation and non-ventilation contributions to global mean ocean-atmosphere radiocarbon offsets across the last deglaciation: implications for atmospheric CO and 14C budget closure Skinner, Luke C Primeau, Francois Jeltsch-Thömmes, Aurich Joos, Fortunat Köhler, Peter Bard, Edouard 2022 https://epic.awi.de/id/eprint/57127/ https://hdl.handle.net/10013/epic.ad1bf67c-8b28-4b14-9f24-eead306e4ff0 unknown Skinner, L. C. , Primeau, F. , Jeltsch-Thömmes, A. , Joos, F. , Köhler, P. orcid:0000-0003-0904-8484 and Bard, E. (2022) Constraining ventilation and non-ventilation contributions to global mean ocean-atmosphere radiocarbon offsets across the last deglaciation: implications for atmospheric CO and 14C budget closure , 114th International Conference on Paleoceanography, Bergen, Norway, 28 August 2022 - 2 September 2022 . hdl:10013/epic.ad1bf67c-8b28-4b14-9f24-eead306e4ff0 EPIC3114th International Conference on Paleoceanography, Bergen, Norway, 2022-08-28-2022-09-02 Conference NonPeerReviewed 2022 ftawi 2023-10-22T23:23:01Z Radiocarbon serves as a tracer that provides unique insights into the ocean’s ability to sequester CO2 from the atmosphere. By applying a Bayesian interpolation method to compiled ocean-atmosphere radiocarbon age offsets (B-Atm), we provide global data fields and mean ocean B-Atm estimates for a suite of time-slices across the last deglaciation. These reveal a stepwise and spatially heterogeneous ‘rejuvenation’ of the deep ocean, and confirm that carbon was incrementally released to the atmosphere through two ‘swings’ of a ventilation seesaw, operating between the North Atlantic and Southern Ocean/North Pacific. A suite of numerical model sensitivity tests further demonstrate that the reconstructed changes could account for two thirds of deglacial atmospheric CO2 rise, depending on the mix of processes driving marine and atmospheric radiocarbon change. Our model sensitivity tests also serve to constrain non-ventilation biases that could affect deglacial B-Atm offsets, under the (extreme) hypothesis of a completely passive ocean response to atmospheric radiocarbon variability driven by radiocarbon production or other non-marine processes. By placing quantitative constraints on the closure of the global radiocarbon budget, our findings help to constrain the contribution of ocean ventilation to observed B-atm changes, and to atmospheric CO2 change, and further suggest that glacial radiocarbon production levels are likely underestimated on average by existing reconstructions. Conference Object North Atlantic Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Pacific Southern Ocean |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
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description |
Radiocarbon serves as a tracer that provides unique insights into the ocean’s ability to sequester CO2 from the atmosphere. By applying a Bayesian interpolation method to compiled ocean-atmosphere radiocarbon age offsets (B-Atm), we provide global data fields and mean ocean B-Atm estimates for a suite of time-slices across the last deglaciation. These reveal a stepwise and spatially heterogeneous ‘rejuvenation’ of the deep ocean, and confirm that carbon was incrementally released to the atmosphere through two ‘swings’ of a ventilation seesaw, operating between the North Atlantic and Southern Ocean/North Pacific. A suite of numerical model sensitivity tests further demonstrate that the reconstructed changes could account for two thirds of deglacial atmospheric CO2 rise, depending on the mix of processes driving marine and atmospheric radiocarbon change. Our model sensitivity tests also serve to constrain non-ventilation biases that could affect deglacial B-Atm offsets, under the (extreme) hypothesis of a completely passive ocean response to atmospheric radiocarbon variability driven by radiocarbon production or other non-marine processes. By placing quantitative constraints on the closure of the global radiocarbon budget, our findings help to constrain the contribution of ocean ventilation to observed B-atm changes, and to atmospheric CO2 change, and further suggest that glacial radiocarbon production levels are likely underestimated on average by existing reconstructions. |
format |
Conference Object |
author |
Skinner, Luke C Primeau, Francois Jeltsch-Thömmes, Aurich Joos, Fortunat Köhler, Peter Bard, Edouard |
spellingShingle |
Skinner, Luke C Primeau, Francois Jeltsch-Thömmes, Aurich Joos, Fortunat Köhler, Peter Bard, Edouard Constraining ventilation and non-ventilation contributions to global mean ocean-atmosphere radiocarbon offsets across the last deglaciation: implications for atmospheric CO and 14C budget closure |
author_facet |
Skinner, Luke C Primeau, Francois Jeltsch-Thömmes, Aurich Joos, Fortunat Köhler, Peter Bard, Edouard |
author_sort |
Skinner, Luke C |
title |
Constraining ventilation and non-ventilation contributions to global mean ocean-atmosphere radiocarbon offsets across the last deglaciation: implications for atmospheric CO and 14C budget closure |
title_short |
Constraining ventilation and non-ventilation contributions to global mean ocean-atmosphere radiocarbon offsets across the last deglaciation: implications for atmospheric CO and 14C budget closure |
title_full |
Constraining ventilation and non-ventilation contributions to global mean ocean-atmosphere radiocarbon offsets across the last deglaciation: implications for atmospheric CO and 14C budget closure |
title_fullStr |
Constraining ventilation and non-ventilation contributions to global mean ocean-atmosphere radiocarbon offsets across the last deglaciation: implications for atmospheric CO and 14C budget closure |
title_full_unstemmed |
Constraining ventilation and non-ventilation contributions to global mean ocean-atmosphere radiocarbon offsets across the last deglaciation: implications for atmospheric CO and 14C budget closure |
title_sort |
constraining ventilation and non-ventilation contributions to global mean ocean-atmosphere radiocarbon offsets across the last deglaciation: implications for atmospheric co and 14c budget closure |
publishDate |
2022 |
url |
https://epic.awi.de/id/eprint/57127/ https://hdl.handle.net/10013/epic.ad1bf67c-8b28-4b14-9f24-eead306e4ff0 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
EPIC3114th International Conference on Paleoceanography, Bergen, Norway, 2022-08-28-2022-09-02 |
op_relation |
Skinner, L. C. , Primeau, F. , Jeltsch-Thömmes, A. , Joos, F. , Köhler, P. orcid:0000-0003-0904-8484 and Bard, E. (2022) Constraining ventilation and non-ventilation contributions to global mean ocean-atmosphere radiocarbon offsets across the last deglaciation: implications for atmospheric CO and 14C budget closure , 114th International Conference on Paleoceanography, Bergen, Norway, 28 August 2022 - 2 September 2022 . hdl:10013/epic.ad1bf67c-8b28-4b14-9f24-eead306e4ff0 |
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1782337446128648192 |