Two-timescale carbon cycle response to an AMOC collapse
Atmospheric CO2 concentrations (pCO2) varied on millennial timescales in phase with Antarctic temperature during the last glacial period. A prevailing view has been that carbon release and uptake by the Southern Ocean dominated this millennial‐scale variability in pCO2. Here, using Earth System Mode...
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ftunivtasmania:oai:eprints.utas.edu.au:33257 2023-05-15T13:31:53+02:00 Two-timescale carbon cycle response to an AMOC collapse Nielsen, SB Jochum, M Pedro, JB Eden, C Nuterman, R 2019 application/pdf https://eprints.utas.edu.au/33257/ https://eprints.utas.edu.au/33257/1/137184%20-%20Two-timescale%20carbon%20cycle%20response%20to%20an%20AMOC%20collapse.pdf en eng Wiley-Blackwell Publishing Inc. https://eprints.utas.edu.au/33257/1/137184%20-%20Two-timescale%20carbon%20cycle%20response%20to%20an%20AMOC%20collapse.pdf Nielsen, SB, Jochum, M, Pedro, JB orcid:0000-0002-0728-2712 , Eden, C and Nuterman, R 2019 , 'Two-timescale carbon cycle response to an AMOC collapse' , Paleoceanography and Paleoclimatology, vol. 34, no. 4 , pp. 511-523 , doi:10.1029/2018PA003481 <http://dx.doi.org/10.1029/2018PA003481>. Earth system model carbon cycle abrupt climate change Article PeerReviewed 2019 ftunivtasmania https://doi.org/10.1029/2018PA003481 2021-09-20T22:18:41Z Atmospheric CO2 concentrations (pCO2) varied on millennial timescales in phase with Antarctic temperature during the last glacial period. A prevailing view has been that carbon release and uptake by the Southern Ocean dominated this millennial‐scale variability in pCO2. Here, using Earth System Model experiments with an improved parameterization of ocean vertical mixing, we find a major role for terrestrial and oceanic carbon releases in driving the pCO2 trend. In our simulations, a change in Northern Hemisphere insolation weakens the Atlantic Meridional Overturning Circulation (AMOC) leading to increasing pCO2 and Antarctic temperatures. The simulated rise in pCO2 is caused in equal parts by increased CO2 outgassing from the global ocean due to a reduced biological activity and changed ventilation rates, and terrestrial carbon release as a response to southward migration of the Intertropical Convergence Zone. The simulated terrestrial release of carbon could explain stadial declines in organic carbon reservoirs observed in recent ice core δ13C measurements. Our results show that parallel variations in Antarctic temperature and pCO2 do not necessitate that the Southern Ocean dominates carbon exchange; instead, changes in carbon flux from the global ocean and land carbon reservoirs can explain the observed pCO2 (and δ13C) changes. Article in Journal/Newspaper Antarc* Antarctic ice core Southern Ocean University of Tasmania: UTas ePrints Antarctic Southern Ocean Paleoceanography and Paleoclimatology 34 4 511 523 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
Earth system model carbon cycle abrupt climate change |
spellingShingle |
Earth system model carbon cycle abrupt climate change Nielsen, SB Jochum, M Pedro, JB Eden, C Nuterman, R Two-timescale carbon cycle response to an AMOC collapse |
topic_facet |
Earth system model carbon cycle abrupt climate change |
description |
Atmospheric CO2 concentrations (pCO2) varied on millennial timescales in phase with Antarctic temperature during the last glacial period. A prevailing view has been that carbon release and uptake by the Southern Ocean dominated this millennial‐scale variability in pCO2. Here, using Earth System Model experiments with an improved parameterization of ocean vertical mixing, we find a major role for terrestrial and oceanic carbon releases in driving the pCO2 trend. In our simulations, a change in Northern Hemisphere insolation weakens the Atlantic Meridional Overturning Circulation (AMOC) leading to increasing pCO2 and Antarctic temperatures. The simulated rise in pCO2 is caused in equal parts by increased CO2 outgassing from the global ocean due to a reduced biological activity and changed ventilation rates, and terrestrial carbon release as a response to southward migration of the Intertropical Convergence Zone. The simulated terrestrial release of carbon could explain stadial declines in organic carbon reservoirs observed in recent ice core δ13C measurements. Our results show that parallel variations in Antarctic temperature and pCO2 do not necessitate that the Southern Ocean dominates carbon exchange; instead, changes in carbon flux from the global ocean and land carbon reservoirs can explain the observed pCO2 (and δ13C) changes. |
format |
Article in Journal/Newspaper |
author |
Nielsen, SB Jochum, M Pedro, JB Eden, C Nuterman, R |
author_facet |
Nielsen, SB Jochum, M Pedro, JB Eden, C Nuterman, R |
author_sort |
Nielsen, SB |
title |
Two-timescale carbon cycle response to an AMOC collapse |
title_short |
Two-timescale carbon cycle response to an AMOC collapse |
title_full |
Two-timescale carbon cycle response to an AMOC collapse |
title_fullStr |
Two-timescale carbon cycle response to an AMOC collapse |
title_full_unstemmed |
Two-timescale carbon cycle response to an AMOC collapse |
title_sort |
two-timescale carbon cycle response to an amoc collapse |
publisher |
Wiley-Blackwell Publishing Inc. |
publishDate |
2019 |
url |
https://eprints.utas.edu.au/33257/ https://eprints.utas.edu.au/33257/1/137184%20-%20Two-timescale%20carbon%20cycle%20response%20to%20an%20AMOC%20collapse.pdf |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic ice core Southern Ocean |
genre_facet |
Antarc* Antarctic ice core Southern Ocean |
op_relation |
https://eprints.utas.edu.au/33257/1/137184%20-%20Two-timescale%20carbon%20cycle%20response%20to%20an%20AMOC%20collapse.pdf Nielsen, SB, Jochum, M, Pedro, JB orcid:0000-0002-0728-2712 , Eden, C and Nuterman, R 2019 , 'Two-timescale carbon cycle response to an AMOC collapse' , Paleoceanography and Paleoclimatology, vol. 34, no. 4 , pp. 511-523 , doi:10.1029/2018PA003481 <http://dx.doi.org/10.1029/2018PA003481>. |
op_doi |
https://doi.org/10.1029/2018PA003481 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
34 |
container_issue |
4 |
container_start_page |
511 |
op_container_end_page |
523 |
_version_ |
1766022154368843776 |