The atmospheric bridge communicated the <i>δ</i><sup>13</sup>C decline during the last deglaciation to the global upper ocean
<p>During the early part of the last glacial termination (17.2–15 ka) and coincident with a <span class="inline-formula">∼35</span> ppm rise in atmospheric <span class="inline-formula">CO<sub>2</sub></span>, a sharp 0.3‰–0.4‰ decline in a...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2021-07-01
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| Series: | Climate of the Past |
| Online Access: | https://cp.copernicus.org/articles/17/1507/2021/cp-17-1507-2021.pdf |
| _version_ | 1818357013951807488 |
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| author | J. Shao L. D. Stott L. Menviel A. Ridgwell M. Ödalen M. Ödalen M. Mohtadi |
| author_facet | J. Shao L. D. Stott L. Menviel A. Ridgwell M. Ödalen M. Ödalen M. Mohtadi |
| author_sort | J. Shao |
| collection | DOAJ |
| description | <p>During the early part of the last glacial termination (17.2–15 ka) and coincident with a <span class="inline-formula">∼35</span> ppm rise in atmospheric <span class="inline-formula">CO<sub>2</sub></span>, a sharp 0.3‰–0.4‰ decline in atmospheric <span class="inline-formula"><i>δ</i><sup>13</sup>CO<sub>2</sub></span> occurred, potentially constraining the key processes that account for the early deglacial <span class="inline-formula">CO<sub>2</sub></span> rise. A comparable <span class="inline-formula"><i>δ</i><sup>13</sup>C</span> decline has also been documented in numerous marine proxy records from surface and thermocline-dwelling planktic foraminifera. The <span class="inline-formula"><i>δ</i><sup>13</sup>C</span> decline recorded in planktic foraminifera has previously been attributed to the release of respired carbon from the deep ocean that was subsequently transported within the upper ocean to sites where the signal was recorded (and then ultimately transferred to the atmosphere). Benthic <span class="inline-formula"><i>δ</i><sup>13</sup>C</span> records from the global upper ocean, including a new record presented here from the tropical Pacific, also document this distinct early deglacial <span class="inline-formula"><i>δ</i><sup>13</sup>C</span> decline. Here we present modeling evidence to show that rather than respired carbon from the deep ocean propagating directly to the upper ocean prior to reaching the atmosphere, the carbon would have first upwelled to the surface in the Southern Ocean where it would have entered the atmosphere. In this way the transmission of isotopically light carbon to the global upper ocean was analogous to the ongoing ocean invasion of fossil fuel <span class="inline-formula">CO<sub>2</sub></span>. The model results suggest that thermocline waters throughout the ocean and 500–2000 m water depths were affected by this atmospheric bridge during the early deglaciation.</p> |
| first_indexed | 2024-12-13T20:06:22Z |
| format | Article |
| id | doaj.art-9162bfc6b79b4cb3b486ef7e5dcfda9b |
| institution | Directory Open Access Journal |
| issn | 1814-9324 1814-9332 |
| language | English |
| last_indexed | 2024-12-13T20:06:22Z |
| publishDate | 2021-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Climate of the Past |
| spelling | doaj.art-9162bfc6b79b4cb3b486ef7e5dcfda9b2022-12-21T23:33:01ZengCopernicus PublicationsClimate of the Past1814-93241814-93322021-07-01171507152110.5194/cp-17-1507-2021The atmospheric bridge communicated the <i>δ</i><sup>13</sup>C decline during the last deglaciation to the global upper oceanJ. Shao0L. D. Stott1L. Menviel2A. Ridgwell3M. Ödalen4M. Ödalen5M. Mohtadi6Department of Earth Science, University of Southern California, Los Angeles, CA 90089, USADepartment of Earth Science, University of Southern California, Los Angeles, CA 90089, USAClimate Change Research Centre, Earth and Sustainability Science Research Centre, University of New South Wales, Sydney, NSW 2052, AustraliaDepartment of Earth and Planetary Sciences, University of California, Riverside, CA 92521, USADepartment of Meteorology, Bolin Centre for Climate Research, Stockholm University, 106 91 Stockholm, SwedenGEOMAR Helmholtz Centre for Ocean Research Kiel, Duesternbrooker Weg 20, 24105 Kiel, GermanyMARUM – Center for Marine Environmental Sciences, University of Bremen, 28359 Bremen, Germany<p>During the early part of the last glacial termination (17.2–15 ka) and coincident with a <span class="inline-formula">∼35</span> ppm rise in atmospheric <span class="inline-formula">CO<sub>2</sub></span>, a sharp 0.3‰–0.4‰ decline in atmospheric <span class="inline-formula"><i>δ</i><sup>13</sup>CO<sub>2</sub></span> occurred, potentially constraining the key processes that account for the early deglacial <span class="inline-formula">CO<sub>2</sub></span> rise. A comparable <span class="inline-formula"><i>δ</i><sup>13</sup>C</span> decline has also been documented in numerous marine proxy records from surface and thermocline-dwelling planktic foraminifera. The <span class="inline-formula"><i>δ</i><sup>13</sup>C</span> decline recorded in planktic foraminifera has previously been attributed to the release of respired carbon from the deep ocean that was subsequently transported within the upper ocean to sites where the signal was recorded (and then ultimately transferred to the atmosphere). Benthic <span class="inline-formula"><i>δ</i><sup>13</sup>C</span> records from the global upper ocean, including a new record presented here from the tropical Pacific, also document this distinct early deglacial <span class="inline-formula"><i>δ</i><sup>13</sup>C</span> decline. Here we present modeling evidence to show that rather than respired carbon from the deep ocean propagating directly to the upper ocean prior to reaching the atmosphere, the carbon would have first upwelled to the surface in the Southern Ocean where it would have entered the atmosphere. In this way the transmission of isotopically light carbon to the global upper ocean was analogous to the ongoing ocean invasion of fossil fuel <span class="inline-formula">CO<sub>2</sub></span>. The model results suggest that thermocline waters throughout the ocean and 500–2000 m water depths were affected by this atmospheric bridge during the early deglaciation.</p>https://cp.copernicus.org/articles/17/1507/2021/cp-17-1507-2021.pdf |
| spellingShingle | J. Shao L. D. Stott L. Menviel A. Ridgwell M. Ödalen M. Ödalen M. Mohtadi The atmospheric bridge communicated the <i>δ</i><sup>13</sup>C decline during the last deglaciation to the global upper ocean Climate of the Past |
| title | The atmospheric bridge communicated the <i>δ</i><sup>13</sup>C decline during the last deglaciation to the global upper ocean |
| title_full | The atmospheric bridge communicated the <i>δ</i><sup>13</sup>C decline during the last deglaciation to the global upper ocean |
| title_fullStr | The atmospheric bridge communicated the <i>δ</i><sup>13</sup>C decline during the last deglaciation to the global upper ocean |
| title_full_unstemmed | The atmospheric bridge communicated the <i>δ</i><sup>13</sup>C decline during the last deglaciation to the global upper ocean |
| title_short | The atmospheric bridge communicated the <i>δ</i><sup>13</sup>C decline during the last deglaciation to the global upper ocean |
| title_sort | atmospheric bridge communicated the i δ i sup 13 sup c decline during the last deglaciation to the global upper ocean |
| url | https://cp.copernicus.org/articles/17/1507/2021/cp-17-1507-2021.pdf |
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