Changes to the air‐sea flux and distribution of radiocarbon in the ocean over the 21st century
We investigate the spatiotemporal evolution of radiocarbon (Δ14C) in the ocean over the 21st century under different scenarios for anthropogenic CO2 emissions and atmospheric CO2 and radiocarbon changes using a 3‐D ocean carbon cycle model. Strong decreases in atmospheric Δ14C in the high‐emission s...
Published in: | Geophysical Research Letters |
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Online Access: | http://hdl.handle.net/10044/1/60458 https://doi.org/10.1029/2018GL078172 |
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ftimperialcol:oai:spiral.imperial.ac.uk:10044/1/60458 2023-05-15T18:25:27+02:00 Changes to the air‐sea flux and distribution of radiocarbon in the ocean over the 21st century Khatiwala, S Graven, H Payne, S Heimbach, P Commission of the European Communities 2018-05-29 http://hdl.handle.net/10044/1/60458 https://doi.org/10.1029/2018GL078172 unknown American Geophysical Union Geophysical Research Letters ©2018. American Geophysical Union. All Rights Reserved. An edited version of this paper was published by AGU. Khatiwala, S., Graven, H., Payne, S., & Heimbach, P. (2018). Changes to the air‐sea flux and distribution of radiocarbon in the ocean over the 21st century. Geophysical Research Letters, 45, 5617–5626. . To view the published open abstract, go to: https://agupubs.onlinelibrary.wiley.com/action/showCitFormats?doi=10.1029%2F2018GL078172 2018-11-29 5626 5617 MD Multidisciplinary Meteorology & Atmospheric Sciences Journal Article 2018 ftimperialcol https://doi.org/10.1029/2018GL078172 2018-09-16T06:02:48Z We investigate the spatiotemporal evolution of radiocarbon (Δ14C) in the ocean over the 21st century under different scenarios for anthropogenic CO2 emissions and atmospheric CO2 and radiocarbon changes using a 3‐D ocean carbon cycle model. Strong decreases in atmospheric Δ14C in the high‐emission scenario result in strong outgassing of 14C over 2050–2100, causing Δ14C spatial gradients in the surface ocean and vertical gradients between the surface and intermediate waters to reverse sign. Surface Δ14C in the subtropical gyres is lower than Δ14C in Pacific Deep Water and Southern Ocean surface water in 2100. In the low‐emission scenario, ocean Δ14C remains slightly higher than in 1950 and relatively constant over 2050–2100. Over the next 20 years we find decadal changes in Δ14C of −30‰ to +5‰ in the upper 2 km of the ocean, which should be detectable with continued hydrographic surveys. Our simulations can help in planning future observations, and they provide a baseline for investigating natural or anthropogenic changes in ocean circulation using ocean Δ14C observations and models. Article in Journal/Newspaper Southern Ocean Imperial College London: Spiral Pacific Southern Ocean Geophysical Research Letters 45 11 5617 5626 |
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Open Polar |
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Imperial College London: Spiral |
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ftimperialcol |
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unknown |
topic |
MD Multidisciplinary Meteorology & Atmospheric Sciences |
spellingShingle |
MD Multidisciplinary Meteorology & Atmospheric Sciences Khatiwala, S Graven, H Payne, S Heimbach, P Changes to the air‐sea flux and distribution of radiocarbon in the ocean over the 21st century |
topic_facet |
MD Multidisciplinary Meteorology & Atmospheric Sciences |
description |
We investigate the spatiotemporal evolution of radiocarbon (Δ14C) in the ocean over the 21st century under different scenarios for anthropogenic CO2 emissions and atmospheric CO2 and radiocarbon changes using a 3‐D ocean carbon cycle model. Strong decreases in atmospheric Δ14C in the high‐emission scenario result in strong outgassing of 14C over 2050–2100, causing Δ14C spatial gradients in the surface ocean and vertical gradients between the surface and intermediate waters to reverse sign. Surface Δ14C in the subtropical gyres is lower than Δ14C in Pacific Deep Water and Southern Ocean surface water in 2100. In the low‐emission scenario, ocean Δ14C remains slightly higher than in 1950 and relatively constant over 2050–2100. Over the next 20 years we find decadal changes in Δ14C of −30‰ to +5‰ in the upper 2 km of the ocean, which should be detectable with continued hydrographic surveys. Our simulations can help in planning future observations, and they provide a baseline for investigating natural or anthropogenic changes in ocean circulation using ocean Δ14C observations and models. |
author2 |
Commission of the European Communities |
format |
Article in Journal/Newspaper |
author |
Khatiwala, S Graven, H Payne, S Heimbach, P |
author_facet |
Khatiwala, S Graven, H Payne, S Heimbach, P |
author_sort |
Khatiwala, S |
title |
Changes to the air‐sea flux and distribution of radiocarbon in the ocean over the 21st century |
title_short |
Changes to the air‐sea flux and distribution of radiocarbon in the ocean over the 21st century |
title_full |
Changes to the air‐sea flux and distribution of radiocarbon in the ocean over the 21st century |
title_fullStr |
Changes to the air‐sea flux and distribution of radiocarbon in the ocean over the 21st century |
title_full_unstemmed |
Changes to the air‐sea flux and distribution of radiocarbon in the ocean over the 21st century |
title_sort |
changes to the air‐sea flux and distribution of radiocarbon in the ocean over the 21st century |
publisher |
American Geophysical Union |
publishDate |
2018 |
url |
http://hdl.handle.net/10044/1/60458 https://doi.org/10.1029/2018GL078172 |
geographic |
Pacific Southern Ocean |
geographic_facet |
Pacific Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
5626 5617 |
op_relation |
Geophysical Research Letters |
op_rights |
©2018. American Geophysical Union. All Rights Reserved. An edited version of this paper was published by AGU. Khatiwala, S., Graven, H., Payne, S., & Heimbach, P. (2018). Changes to the air‐sea flux and distribution of radiocarbon in the ocean over the 21st century. Geophysical Research Letters, 45, 5617–5626. . To view the published open abstract, go to: https://agupubs.onlinelibrary.wiley.com/action/showCitFormats?doi=10.1029%2F2018GL078172 2018-11-29 |
op_doi |
https://doi.org/10.1029/2018GL078172 |
container_title |
Geophysical Research Letters |
container_volume |
45 |
container_issue |
11 |
container_start_page |
5617 |
op_container_end_page |
5626 |
_version_ |
1766206931675906048 |