Sudden emergence of a shallow aragonite saturation horizon in the Southern Ocean
Models project that with current CO2 emission rates, the Southern Ocean surface will be undersaturated with respect to aragonite by the end of this century(1-4). This will result in widespread impacts on biogeochemistry and ocean ecosystems(5-7), particularly the health of aragonitic organisms, such...
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fttriple:oai:gotriple.eu:10670/1.gca6uz 2023-05-15T18:24:04+02:00 Sudden emergence of a shallow aragonite saturation horizon in the Southern Ocean Negrete-garcia, Gabriela Lovenduski, Nicole S. Hauri, Claudine Krumhardt, Kristen M. Lauvset, Siv K. https://doi.org/10.1038/s41558-019-0418-8 https://archimer.ifremer.fr/doc/00676/78807/81061.pdf https://archimer.ifremer.fr/doc/00676/78807/81062.pdf https://archimer.ifremer.fr/doc/00676/78807/81063.pdf https://archimer.ifremer.fr/doc/00676/78807/ en eng Nature Publishing Group doi:10.1038/s41558-019-0418-8 10670/1.gca6uz https://archimer.ifremer.fr/doc/00676/78807/81061.pdf https://archimer.ifremer.fr/doc/00676/78807/81062.pdf https://archimer.ifremer.fr/doc/00676/78807/81063.pdf https://archimer.ifremer.fr/doc/00676/78807/ other Archimer, archive institutionnelle de l'Ifremer Nature Climate Change (1758-678X) (Nature Publishing Group), 2019-04 , Vol. 9 , N. 4 , P. 313-317 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1038/s41558-019-0418-8 2023-01-22T18:36:38Z Models project that with current CO2 emission rates, the Southern Ocean surface will be undersaturated with respect to aragonite by the end of this century(1-4). This will result in widespread impacts on biogeochemistry and ocean ecosystems(5-7), particularly the health of aragonitic organisms, such as pteropods(7), which can dominate polar surface water communities(6). Here, we quantify the depth of the present-day Southern Ocean aragonite saturation horizon using hydrographic and ocean carbon chemistry observations, and use a large ensemble of simulations from the Community Earth System Model (CESM)(8,9) to track its evolution. A new, shallow aragonite saturation horizon emerges in many Southern Ocean locations between now and the end of the century. While all ensemble members capture the emergence, internal climate variability may affect the year of emergence; thus, its detection may have been overlooked by ensemble average analysis in the past. The emergence of the new horizon is driven by the slow accumulation of anthropogenic CO2 in the Southern Ocean thermocline, where the carbonate ion concentration exhibits a local minimum and approaches undersaturation. The new horizon is also apparent under an emission-stabilizing scenario indicating an inevitable, sudden decrease in the volume of suitable habitat for aragonitic organisms. Text Southern Ocean Unknown Southern Ocean Nature Climate Change 9 4 313 317 |
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geo envir Negrete-garcia, Gabriela Lovenduski, Nicole S. Hauri, Claudine Krumhardt, Kristen M. Lauvset, Siv K. Sudden emergence of a shallow aragonite saturation horizon in the Southern Ocean |
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geo envir |
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Models project that with current CO2 emission rates, the Southern Ocean surface will be undersaturated with respect to aragonite by the end of this century(1-4). This will result in widespread impacts on biogeochemistry and ocean ecosystems(5-7), particularly the health of aragonitic organisms, such as pteropods(7), which can dominate polar surface water communities(6). Here, we quantify the depth of the present-day Southern Ocean aragonite saturation horizon using hydrographic and ocean carbon chemistry observations, and use a large ensemble of simulations from the Community Earth System Model (CESM)(8,9) to track its evolution. A new, shallow aragonite saturation horizon emerges in many Southern Ocean locations between now and the end of the century. While all ensemble members capture the emergence, internal climate variability may affect the year of emergence; thus, its detection may have been overlooked by ensemble average analysis in the past. The emergence of the new horizon is driven by the slow accumulation of anthropogenic CO2 in the Southern Ocean thermocline, where the carbonate ion concentration exhibits a local minimum and approaches undersaturation. The new horizon is also apparent under an emission-stabilizing scenario indicating an inevitable, sudden decrease in the volume of suitable habitat for aragonitic organisms. |
format |
Text |
author |
Negrete-garcia, Gabriela Lovenduski, Nicole S. Hauri, Claudine Krumhardt, Kristen M. Lauvset, Siv K. |
author_facet |
Negrete-garcia, Gabriela Lovenduski, Nicole S. Hauri, Claudine Krumhardt, Kristen M. Lauvset, Siv K. |
author_sort |
Negrete-garcia, Gabriela |
title |
Sudden emergence of a shallow aragonite saturation horizon in the Southern Ocean |
title_short |
Sudden emergence of a shallow aragonite saturation horizon in the Southern Ocean |
title_full |
Sudden emergence of a shallow aragonite saturation horizon in the Southern Ocean |
title_fullStr |
Sudden emergence of a shallow aragonite saturation horizon in the Southern Ocean |
title_full_unstemmed |
Sudden emergence of a shallow aragonite saturation horizon in the Southern Ocean |
title_sort |
sudden emergence of a shallow aragonite saturation horizon in the southern ocean |
publisher |
Nature Publishing Group |
url |
https://doi.org/10.1038/s41558-019-0418-8 https://archimer.ifremer.fr/doc/00676/78807/81061.pdf https://archimer.ifremer.fr/doc/00676/78807/81062.pdf https://archimer.ifremer.fr/doc/00676/78807/81063.pdf https://archimer.ifremer.fr/doc/00676/78807/ |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
Archimer, archive institutionnelle de l'Ifremer Nature Climate Change (1758-678X) (Nature Publishing Group), 2019-04 , Vol. 9 , N. 4 , P. 313-317 |
op_relation |
doi:10.1038/s41558-019-0418-8 10670/1.gca6uz https://archimer.ifremer.fr/doc/00676/78807/81061.pdf https://archimer.ifremer.fr/doc/00676/78807/81062.pdf https://archimer.ifremer.fr/doc/00676/78807/81063.pdf https://archimer.ifremer.fr/doc/00676/78807/ |
op_rights |
other |
op_doi |
https://doi.org/10.1038/s41558-019-0418-8 |
container_title |
Nature Climate Change |
container_volume |
9 |
container_issue |
4 |
container_start_page |
313 |
op_container_end_page |
317 |
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1766204361762930688 |