Rejuvenating the ocean: mean ocean radiocarbon, CO2 release, and radiocarbon budget closure across the last deglaciation
<jats:p>Abstract. Radiocarbon is a tracer that provides unique insights into the ocean's ability to sequester CO2 from the atmosphere. While spatial patterns of radiocarbon in the ocean interior can indicate the vectors and timescales for carbon transport through the ocean, estimates of t...
Published in: | Climate of the Past |
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Copernicus GmbH
2023
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Online Access: | https://epic.awi.de/id/eprint/58110/ https://epic.awi.de/id/eprint/58110/1/skinner2023cp.pdf https://doi.org/10.5194/cp-19-2177-2023 https://hdl.handle.net/10013/epic.1195fa96-1f62-4b56-8f77-d0eb648667b1 |
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ftawi:oai:epic.awi.de:58110 2023-12-10T09:51:45+01:00 Rejuvenating the ocean: mean ocean radiocarbon, CO2 release, and radiocarbon budget closure across the last deglaciation Skinner, Luke Primeau, Francois Jeltsch-Thömmes, Aurich Joos, Fortunat Köhler, Peter Bard, Edouard 2023-11-03 application/pdf https://epic.awi.de/id/eprint/58110/ https://epic.awi.de/id/eprint/58110/1/skinner2023cp.pdf https://doi.org/10.5194/cp-19-2177-2023 https://hdl.handle.net/10013/epic.1195fa96-1f62-4b56-8f77-d0eb648667b1 unknown Copernicus GmbH https://epic.awi.de/id/eprint/58110/1/skinner2023cp.pdf Skinner, L. , Primeau, F. , Jeltsch-Thömmes, A. , Joos, F. , Köhler, P. orcid:0000-0003-0904-8484 and Bard, E. (2023) Rejuvenating the ocean: mean ocean radiocarbon, CO2 release, and radiocarbon budget closure across the last deglaciation , Climate of the Past, 19 (11), pp. 2177-2202 . doi:10.5194/cp-19-2177-2023 <https://doi.org/10.5194/cp-19-2177-2023> , hdl:10013/epic.1195fa96-1f62-4b56-8f77-d0eb648667b1 EPIC3Climate of the Past, Copernicus GmbH, 19(11), pp. 2177-2202, ISSN: 1814-9332 Article isiRev 2023 ftawi https://doi.org/10.5194/cp-19-2177-2023 2023-11-13T00:23:12Z <jats:p>Abstract. Radiocarbon is a tracer that provides unique insights into the ocean's ability to sequester CO2 from the atmosphere. While spatial patterns of radiocarbon in the ocean interior can indicate the vectors and timescales for carbon transport through the ocean, estimates of the global average ocean–atmosphere radiocarbon age offset (B-Atm) place constraints on the closure of the global carbon cycle. Here, we apply a Bayesian interpolation method to compiled B-Atm data to generate global interpolated fields and mean ocean B-Atm estimates for a suite of time slices across the last deglaciation. The compiled data and interpolations confirm a stepwise and spatially heterogeneous “rejuvenation” of the ocean, suggesting that carbon was released to the atmosphere through two swings of a “ventilation seesaw” operating between the North Atlantic and both the Southern Ocean and the North Pacific. Sensitivity tests using the Bern3D model of intermediate complexity demonstrate that a portion of the reconstructed deglacial B-Atm changes may reflect “phase-attenuation” biases that are unrelated to ocean ventilation and that arise from independent atmospheric radiocarbon dynamics instead. A deglacial minimum in B-Atm offsets during the Bølling–Allerød could partly reflect such a bias. However, the sensitivity tests further demonstrate that when correcting for such biases, ocean “ventilation” could still account for at least one-third of deglacial atmospheric CO2 rise. This contribution to CO2 rise appears to have continued through the Younger Dryas, though much of the impact was likely achieved by the end of the Bølling–Allerød, indicating a key role for marine carbon cycle adjustment early in the deglacial process. Our global average B-Atm estimates place further new constraints on the long-standing mystery of global radiocarbon budget closure across the last deglaciation and suggest that glacial radiocarbon production levels are likely underestimated on average by existing reconstructions. </jats:p> Article in Journal/Newspaper North Atlantic Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Pacific Southern Ocean Climate of the Past 19 11 2177 2202 |
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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 |
<jats:p>Abstract. Radiocarbon is a tracer that provides unique insights into the ocean's ability to sequester CO2 from the atmosphere. While spatial patterns of radiocarbon in the ocean interior can indicate the vectors and timescales for carbon transport through the ocean, estimates of the global average ocean–atmosphere radiocarbon age offset (B-Atm) place constraints on the closure of the global carbon cycle. Here, we apply a Bayesian interpolation method to compiled B-Atm data to generate global interpolated fields and mean ocean B-Atm estimates for a suite of time slices across the last deglaciation. The compiled data and interpolations confirm a stepwise and spatially heterogeneous “rejuvenation” of the ocean, suggesting that carbon was released to the atmosphere through two swings of a “ventilation seesaw” operating between the North Atlantic and both the Southern Ocean and the North Pacific. Sensitivity tests using the Bern3D model of intermediate complexity demonstrate that a portion of the reconstructed deglacial B-Atm changes may reflect “phase-attenuation” biases that are unrelated to ocean ventilation and that arise from independent atmospheric radiocarbon dynamics instead. A deglacial minimum in B-Atm offsets during the Bølling–Allerød could partly reflect such a bias. However, the sensitivity tests further demonstrate that when correcting for such biases, ocean “ventilation” could still account for at least one-third of deglacial atmospheric CO2 rise. This contribution to CO2 rise appears to have continued through the Younger Dryas, though much of the impact was likely achieved by the end of the Bølling–Allerød, indicating a key role for marine carbon cycle adjustment early in the deglacial process. Our global average B-Atm estimates place further new constraints on the long-standing mystery of global radiocarbon budget closure across the last deglaciation and suggest that glacial radiocarbon production levels are likely underestimated on average by existing reconstructions. </jats:p> |
format |
Article in Journal/Newspaper |
author |
Skinner, Luke Primeau, Francois Jeltsch-Thömmes, Aurich Joos, Fortunat Köhler, Peter Bard, Edouard |
spellingShingle |
Skinner, Luke Primeau, Francois Jeltsch-Thömmes, Aurich Joos, Fortunat Köhler, Peter Bard, Edouard Rejuvenating the ocean: mean ocean radiocarbon, CO2 release, and radiocarbon budget closure across the last deglaciation |
author_facet |
Skinner, Luke Primeau, Francois Jeltsch-Thömmes, Aurich Joos, Fortunat Köhler, Peter Bard, Edouard |
author_sort |
Skinner, Luke |
title |
Rejuvenating the ocean: mean ocean radiocarbon, CO2 release, and radiocarbon budget closure across the last deglaciation |
title_short |
Rejuvenating the ocean: mean ocean radiocarbon, CO2 release, and radiocarbon budget closure across the last deglaciation |
title_full |
Rejuvenating the ocean: mean ocean radiocarbon, CO2 release, and radiocarbon budget closure across the last deglaciation |
title_fullStr |
Rejuvenating the ocean: mean ocean radiocarbon, CO2 release, and radiocarbon budget closure across the last deglaciation |
title_full_unstemmed |
Rejuvenating the ocean: mean ocean radiocarbon, CO2 release, and radiocarbon budget closure across the last deglaciation |
title_sort |
rejuvenating the ocean: mean ocean radiocarbon, co2 release, and radiocarbon budget closure across the last deglaciation |
publisher |
Copernicus GmbH |
publishDate |
2023 |
url |
https://epic.awi.de/id/eprint/58110/ https://epic.awi.de/id/eprint/58110/1/skinner2023cp.pdf https://doi.org/10.5194/cp-19-2177-2023 https://hdl.handle.net/10013/epic.1195fa96-1f62-4b56-8f77-d0eb648667b1 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
EPIC3Climate of the Past, Copernicus GmbH, 19(11), pp. 2177-2202, ISSN: 1814-9332 |
op_relation |
https://epic.awi.de/id/eprint/58110/1/skinner2023cp.pdf Skinner, L. , Primeau, F. , Jeltsch-Thömmes, A. , Joos, F. , Köhler, P. orcid:0000-0003-0904-8484 and Bard, E. (2023) Rejuvenating the ocean: mean ocean radiocarbon, CO2 release, and radiocarbon budget closure across the last deglaciation , Climate of the Past, 19 (11), pp. 2177-2202 . doi:10.5194/cp-19-2177-2023 <https://doi.org/10.5194/cp-19-2177-2023> , hdl:10013/epic.1195fa96-1f62-4b56-8f77-d0eb648667b1 |
op_doi |
https://doi.org/10.5194/cp-19-2177-2023 |
container_title |
Climate of the Past |
container_volume |
19 |
container_issue |
11 |
container_start_page |
2177 |
op_container_end_page |
2202 |
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