Increased nutrient supply to the Southern Ocean during the Holocene and its implications for the pre-industrial atmospheric CO_2 rise
A rise in the atmospheric CO_2 concentration of ~20 parts per million over the course of the Holocene has long been recognized as exceptional among interglacials and is in need of explanation. Previous hypotheses involved natural or anthropogenic changes in terrestrial biomass, carbonate compensatio...
Published in: | Nature Geoscience |
---|---|
Main Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Nature Publishing Group
2018
|
Subjects: | |
Online Access: | https://authors.library.caltech.edu/86993/ https://authors.library.caltech.edu/86993/3/41561_2018_191_MOESM1_ESM.pdf https://authors.library.caltech.edu/86993/4/41561_2018_191_MOESM2_ESM.xlsx https://resolver.caltech.edu/CaltechAUTHORS:20180612-092939297 |
id |
ftcaltechauth:oai:authors.library.caltech.edu:86993 |
---|---|
record_format |
openpolar |
spelling |
ftcaltechauth:oai:authors.library.caltech.edu:86993 2023-05-15T17:25:25+02:00 Increased nutrient supply to the Southern Ocean during the Holocene and its implications for the pre-industrial atmospheric CO_2 rise Studer, Anja S. Sigman, Daniel M. Martínez-García, Alfredo Thöle, Lena M. Michel, Elisabeth Jaccard, Samuel L. Lippold, Jörg A. Mazaud, Alain Wang, Xingchen T. Robinson, Laura F. Adkins, Jess F. Haug, Gerald H. 2018-10 application/pdf application/vnd.ms-excel https://authors.library.caltech.edu/86993/ https://authors.library.caltech.edu/86993/3/41561_2018_191_MOESM1_ESM.pdf https://authors.library.caltech.edu/86993/4/41561_2018_191_MOESM2_ESM.xlsx https://resolver.caltech.edu/CaltechAUTHORS:20180612-092939297 en eng Nature Publishing Group https://authors.library.caltech.edu/86993/3/41561_2018_191_MOESM1_ESM.pdf https://authors.library.caltech.edu/86993/4/41561_2018_191_MOESM2_ESM.xlsx Studer, Anja S. and Sigman, Daniel M. and Martínez-García, Alfredo and Thöle, Lena M. and Michel, Elisabeth and Jaccard, Samuel L. and Lippold, Jörg A. and Mazaud, Alain and Wang, Xingchen T. and Robinson, Laura F. and Adkins, Jess F. and Haug, Gerald H. (2018) Increased nutrient supply to the Southern Ocean during the Holocene and its implications for the pre-industrial atmospheric CO_2 rise. Nature Geoscience, 11 (10). pp. 756-760. ISSN 1752-0894. doi:10.1038/s41561-018-0191-8. https://resolver.caltech.edu/CaltechAUTHORS:20180612-092939297 <https://resolver.caltech.edu/CaltechAUTHORS:20180612-092939297> other Article PeerReviewed 2018 ftcaltechauth https://doi.org/10.1038/s41561-018-0191-8 2021-11-18T18:46:12Z A rise in the atmospheric CO_2 concentration of ~20 parts per million over the course of the Holocene has long been recognized as exceptional among interglacials and is in need of explanation. Previous hypotheses involved natural or anthropogenic changes in terrestrial biomass, carbonate compensation in response to deglacial outgassing of oceanic CO_2, and enhanced shallow water carbonate deposition. Here, we compile new and previously published fossil-bound nitrogen isotope records from the Southern Ocean that indicate a rise in surface nitrate concentration through the Holocene. When coupled with increasing or constant export production, these data suggest an acceleration of nitrate supply to the Southern Ocean surface from underlying deep water. This change would have weakened the ocean’s biological pump that stores CO_2 in the ocean interior, possibly explaining the Holocene atmospheric CO_2 rise. Over the Holocene, the circum-North Atlantic region cooled, and the formation of North Atlantic Deep Water appears to have slowed. Thus, the ‘seesaw’ in deep ocean ventilation between the North Atlantic and the Southern Ocean that has been invoked for millennial-scale events, deglaciations and the last interglacial period may have also operated, albeit in a more gradual form, over the Holocene. Article in Journal/Newspaper North Atlantic Deep Water North Atlantic Southern Ocean Caltech Authors (California Institute of Technology) Southern Ocean Nature Geoscience 11 10 756 760 |
institution |
Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
English |
description |
A rise in the atmospheric CO_2 concentration of ~20 parts per million over the course of the Holocene has long been recognized as exceptional among interglacials and is in need of explanation. Previous hypotheses involved natural or anthropogenic changes in terrestrial biomass, carbonate compensation in response to deglacial outgassing of oceanic CO_2, and enhanced shallow water carbonate deposition. Here, we compile new and previously published fossil-bound nitrogen isotope records from the Southern Ocean that indicate a rise in surface nitrate concentration through the Holocene. When coupled with increasing or constant export production, these data suggest an acceleration of nitrate supply to the Southern Ocean surface from underlying deep water. This change would have weakened the ocean’s biological pump that stores CO_2 in the ocean interior, possibly explaining the Holocene atmospheric CO_2 rise. Over the Holocene, the circum-North Atlantic region cooled, and the formation of North Atlantic Deep Water appears to have slowed. Thus, the ‘seesaw’ in deep ocean ventilation between the North Atlantic and the Southern Ocean that has been invoked for millennial-scale events, deglaciations and the last interglacial period may have also operated, albeit in a more gradual form, over the Holocene. |
format |
Article in Journal/Newspaper |
author |
Studer, Anja S. Sigman, Daniel M. Martínez-García, Alfredo Thöle, Lena M. Michel, Elisabeth Jaccard, Samuel L. Lippold, Jörg A. Mazaud, Alain Wang, Xingchen T. Robinson, Laura F. Adkins, Jess F. Haug, Gerald H. |
spellingShingle |
Studer, Anja S. Sigman, Daniel M. Martínez-García, Alfredo Thöle, Lena M. Michel, Elisabeth Jaccard, Samuel L. Lippold, Jörg A. Mazaud, Alain Wang, Xingchen T. Robinson, Laura F. Adkins, Jess F. Haug, Gerald H. Increased nutrient supply to the Southern Ocean during the Holocene and its implications for the pre-industrial atmospheric CO_2 rise |
author_facet |
Studer, Anja S. Sigman, Daniel M. Martínez-García, Alfredo Thöle, Lena M. Michel, Elisabeth Jaccard, Samuel L. Lippold, Jörg A. Mazaud, Alain Wang, Xingchen T. Robinson, Laura F. Adkins, Jess F. Haug, Gerald H. |
author_sort |
Studer, Anja S. |
title |
Increased nutrient supply to the Southern Ocean during the Holocene and its implications for the pre-industrial atmospheric CO_2 rise |
title_short |
Increased nutrient supply to the Southern Ocean during the Holocene and its implications for the pre-industrial atmospheric CO_2 rise |
title_full |
Increased nutrient supply to the Southern Ocean during the Holocene and its implications for the pre-industrial atmospheric CO_2 rise |
title_fullStr |
Increased nutrient supply to the Southern Ocean during the Holocene and its implications for the pre-industrial atmospheric CO_2 rise |
title_full_unstemmed |
Increased nutrient supply to the Southern Ocean during the Holocene and its implications for the pre-industrial atmospheric CO_2 rise |
title_sort |
increased nutrient supply to the southern ocean during the holocene and its implications for the pre-industrial atmospheric co_2 rise |
publisher |
Nature Publishing Group |
publishDate |
2018 |
url |
https://authors.library.caltech.edu/86993/ https://authors.library.caltech.edu/86993/3/41561_2018_191_MOESM1_ESM.pdf https://authors.library.caltech.edu/86993/4/41561_2018_191_MOESM2_ESM.xlsx https://resolver.caltech.edu/CaltechAUTHORS:20180612-092939297 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
North Atlantic Deep Water North Atlantic Southern Ocean |
genre_facet |
North Atlantic Deep Water North Atlantic Southern Ocean |
op_relation |
https://authors.library.caltech.edu/86993/3/41561_2018_191_MOESM1_ESM.pdf https://authors.library.caltech.edu/86993/4/41561_2018_191_MOESM2_ESM.xlsx Studer, Anja S. and Sigman, Daniel M. and Martínez-García, Alfredo and Thöle, Lena M. and Michel, Elisabeth and Jaccard, Samuel L. and Lippold, Jörg A. and Mazaud, Alain and Wang, Xingchen T. and Robinson, Laura F. and Adkins, Jess F. and Haug, Gerald H. (2018) Increased nutrient supply to the Southern Ocean during the Holocene and its implications for the pre-industrial atmospheric CO_2 rise. Nature Geoscience, 11 (10). pp. 756-760. ISSN 1752-0894. doi:10.1038/s41561-018-0191-8. https://resolver.caltech.edu/CaltechAUTHORS:20180612-092939297 <https://resolver.caltech.edu/CaltechAUTHORS:20180612-092939297> |
op_rights |
other |
op_doi |
https://doi.org/10.1038/s41561-018-0191-8 |
container_title |
Nature Geoscience |
container_volume |
11 |
container_issue |
10 |
container_start_page |
756 |
op_container_end_page |
760 |
_version_ |
1766116847946563584 |