Impact of oceanic circulation changes on atmospheric δ¹³ CO₂
δ¹³ CO₂ measured in Antarctic ice cores provides constraints on oceanic and terrestrial carbon cycle processes linked with millennial-scale changes in atmospheric CO₂. However, the interpretation of δ¹³ CO₂ is not straight-forward. Using carbon isotope-enabled versions of the LOVECLIM and Bern3D mod...
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ftunivbern:oai:boris.unibe.ch:74402 2023-08-20T04:00:37+02:00 Impact of oceanic circulation changes on atmospheric δ¹³ CO₂ Menviel, L. Mouchet, A. Meissner, K. J. Joos, F. England, M. H. 2015 application/pdf https://boris.unibe.ch/74402/1/menviel15gbc.pdf https://boris.unibe.ch/74402/ eng eng American Geophysical Union https://boris.unibe.ch/74402/ info:eu-repo/semantics/openAccess Menviel, L.; Mouchet, A.; Meissner, K. J.; Joos, F.; England, M. H. (2015). Impact of oceanic circulation changes on atmospheric δ¹³ CO₂. Global biogeochemical cycles, 29(11), pp. 1944-1961. American Geophysical Union 10.1002/2015GB005207 <http://dx.doi.org/10.1002/2015GB005207> 530 Physics 550 Earth sciences & geology info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2015 ftunivbern https://doi.org/10.1002/2015GB005207 2023-07-31T21:21:35Z δ¹³ CO₂ measured in Antarctic ice cores provides constraints on oceanic and terrestrial carbon cycle processes linked with millennial-scale changes in atmospheric CO₂. However, the interpretation of δ¹³ CO₂ is not straight-forward. Using carbon isotope-enabled versions of the LOVECLIM and Bern3D models, we perform a set of sensitivity experiments in which the formation rates of North Atlantic Deep Water (NADW), North Pacific Deep Water (NPDW), Antarctic Bottom Water (AABW), and Antarctic Intermediate Water (AAIW) are varied. We study the impact of these circulation changes on atmospheric δ¹³ CO₂ as well as on the oceanic δ¹³ CO₂ distribution. In general, we find that the formation rates of AABW, NADW, NPDW, and AAIW are negatively correlated with changes in δ¹³ CO₂: namely, strong oceanic ventilation decreases atmospheric δ¹³ CO₂. However, since large-scale oceanic circulation reorganizations also impact nutrient utilization and the Earth’s climate, the relationship between atmospheric δ¹³ CO₂ levels and ocean ventilation rate is not unequivocal. In both models atmospheric δ¹³ CO₂ is very sensitive to changes in AABW formation rates: increased AABW formation enhances the transport of low δ¹³ CO₂ waters to the surface and decreases atmospheric δ¹³ CO₂. By contrast, the impact of NADW changes on atmospheric δ¹³ CO₂ is less robust and might be model dependent. This results from complex interplay between global climate, carbon cycle, and the formation rate of NADW, a water body characterized by relatively high δ¹³ CO₂. Article in Journal/Newspaper Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic BORIS (Bern Open Repository and Information System, University of Bern) Antarctic Pacific Global Biogeochemical Cycles 29 11 1944 1961 |
institution |
Open Polar |
collection |
BORIS (Bern Open Repository and Information System, University of Bern) |
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ftunivbern |
language |
English |
topic |
530 Physics 550 Earth sciences & geology |
spellingShingle |
530 Physics 550 Earth sciences & geology Menviel, L. Mouchet, A. Meissner, K. J. Joos, F. England, M. H. Impact of oceanic circulation changes on atmospheric δ¹³ CO₂ |
topic_facet |
530 Physics 550 Earth sciences & geology |
description |
δ¹³ CO₂ measured in Antarctic ice cores provides constraints on oceanic and terrestrial carbon cycle processes linked with millennial-scale changes in atmospheric CO₂. However, the interpretation of δ¹³ CO₂ is not straight-forward. Using carbon isotope-enabled versions of the LOVECLIM and Bern3D models, we perform a set of sensitivity experiments in which the formation rates of North Atlantic Deep Water (NADW), North Pacific Deep Water (NPDW), Antarctic Bottom Water (AABW), and Antarctic Intermediate Water (AAIW) are varied. We study the impact of these circulation changes on atmospheric δ¹³ CO₂ as well as on the oceanic δ¹³ CO₂ distribution. In general, we find that the formation rates of AABW, NADW, NPDW, and AAIW are negatively correlated with changes in δ¹³ CO₂: namely, strong oceanic ventilation decreases atmospheric δ¹³ CO₂. However, since large-scale oceanic circulation reorganizations also impact nutrient utilization and the Earth’s climate, the relationship between atmospheric δ¹³ CO₂ levels and ocean ventilation rate is not unequivocal. In both models atmospheric δ¹³ CO₂ is very sensitive to changes in AABW formation rates: increased AABW formation enhances the transport of low δ¹³ CO₂ waters to the surface and decreases atmospheric δ¹³ CO₂. By contrast, the impact of NADW changes on atmospheric δ¹³ CO₂ is less robust and might be model dependent. This results from complex interplay between global climate, carbon cycle, and the formation rate of NADW, a water body characterized by relatively high δ¹³ CO₂. |
format |
Article in Journal/Newspaper |
author |
Menviel, L. Mouchet, A. Meissner, K. J. Joos, F. England, M. H. |
author_facet |
Menviel, L. Mouchet, A. Meissner, K. J. Joos, F. England, M. H. |
author_sort |
Menviel, L. |
title |
Impact of oceanic circulation changes on atmospheric δ¹³ CO₂ |
title_short |
Impact of oceanic circulation changes on atmospheric δ¹³ CO₂ |
title_full |
Impact of oceanic circulation changes on atmospheric δ¹³ CO₂ |
title_fullStr |
Impact of oceanic circulation changes on atmospheric δ¹³ CO₂ |
title_full_unstemmed |
Impact of oceanic circulation changes on atmospheric δ¹³ CO₂ |
title_sort |
impact of oceanic circulation changes on atmospheric δ¹³ co₂ |
publisher |
American Geophysical Union |
publishDate |
2015 |
url |
https://boris.unibe.ch/74402/1/menviel15gbc.pdf https://boris.unibe.ch/74402/ |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
op_source |
Menviel, L.; Mouchet, A.; Meissner, K. J.; Joos, F.; England, M. H. (2015). Impact of oceanic circulation changes on atmospheric δ¹³ CO₂. Global biogeochemical cycles, 29(11), pp. 1944-1961. American Geophysical Union 10.1002/2015GB005207 <http://dx.doi.org/10.1002/2015GB005207> |
op_relation |
https://boris.unibe.ch/74402/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/2015GB005207 |
container_title |
Global Biogeochemical Cycles |
container_volume |
29 |
container_issue |
11 |
container_start_page |
1944 |
op_container_end_page |
1961 |
_version_ |
1774719294884544512 |