Abrupt pre-Bølling-Allerød warming and circulation changes in the deep ocean.
Saved in:
| Title: | Abrupt pre-Bølling-Allerød warming and circulation changes in the deep ocean. |
|---|---|
| Authors: | Thiagarajan, Nivedita, Subhas, Adam V., Southon, John R., Eiler, John M., Adkins, Jess F. |
| Source: | Nature. 7/3/2014, Vol. 511 Issue 7507, p75-78. 4p. |
| Subjects: | Climate change research, Carbon dioxide & the environment, Glacial melting, Water temperature & the environment, Younger Dryas |
| Geographic Terms: | North Atlantic Region |
| Abstract: | Several large and rapid changes in atmospheric temperature and the partial pressure of carbon dioxide in the atmosphere-probably linked to changes in deep ocean circulation-occurred during the last deglaciation. The abrupt temperature rise in the Northern Hemisphere and the restart of the Atlantic meridional overturning circulation at the start of the Bølling-Allerød interstadial, 14,700 years ago, are among the most dramatic deglacial events, but their underlying physical causes are not known. Here we show that the release of heat from warm waters in the deep North Atlantic Ocean probably triggered the Bølling-Allerød warming and reinvigoration of the Atlantic meridional overturning circulation. Our results are based on coupled radiocarbon and uranium-series dates, along with clumped isotope temperature estimates, from water column profiles of fossil deep-sea corals in a limited area of the western North Atlantic. We find that during Heinrich stadial 1 (the cool period immediately before the Bølling-Allerød interstadial), the deep ocean was about three degrees Celsius warmer than shallower waters above. This reversal of the ocean's usual thermal stratification pre-dates the Bølling-Allerød warming and must have been associated with increased salinity at depth to preserve the static stability of the water column. The depleted radiocarbon content of the warm and salty water mass implies a long-term disconnect from rapid surface exchanges, and, although uncertainties remain, is most consistent with a Southern Ocean source. The Heinrich stadial 1 ocean profile is distinct from the modern water column, that for the Last Glacial Maximum and that for the Younger Dryas, suggesting that the patterns we observe are a unique feature of the deglacial climate system. Our observations indicate that the deep ocean influenced dramatic Northern Hemisphere warming by storing heat at depth that preconditioned the system for a subsequent abrupt overturning event during the Bølling-Allerød interstadial. [ABSTRACT FROM AUTHOR] |
| Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Psychology and Behavioral Sciences Collection |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
|---|---|
| Header | DbId: pbh DbLabel: Psychology and Behavioral Sciences Collection An: 96923514 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
| IllustrationInfo | |
| Items | – Name: Title Label: Title Group: Ti Data: Abrupt pre-Bølling-Allerød warming and circulation changes in the deep ocean. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Thiagarajan%2C+Nivedita%22">Thiagarajan, Nivedita</searchLink><br /><searchLink fieldCode="AR" term="%22Subhas%2C+Adam+V%2E%22">Subhas, Adam V.</searchLink><br /><searchLink fieldCode="AR" term="%22Southon%2C+John+R%2E%22">Southon, John R.</searchLink><br /><searchLink fieldCode="AR" term="%22Eiler%2C+John+M%2E%22">Eiler, John M.</searchLink><br /><searchLink fieldCode="AR" term="%22Adkins%2C+Jess+F%2E%22">Adkins, Jess F.</searchLink> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Nature%22">Nature</searchLink>. 7/3/2014, Vol. 511 Issue 7507, p75-78. 4p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Climate+change+research%22">Climate change research</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+dioxide+%26+the+environment%22">Carbon dioxide & the environment</searchLink><br /><searchLink fieldCode="DE" term="%22Glacial+melting%22">Glacial melting</searchLink><br /><searchLink fieldCode="DE" term="%22Water+temperature+%26+the+environment%22">Water temperature & the environment</searchLink><br /><searchLink fieldCode="DE" term="%22Younger+Dryas%22">Younger Dryas</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22North+Atlantic+Region%22">North Atlantic Region</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Several large and rapid changes in atmospheric temperature and the partial pressure of carbon dioxide in the atmosphere-probably linked to changes in deep ocean circulation-occurred during the last deglaciation. The abrupt temperature rise in the Northern Hemisphere and the restart of the Atlantic meridional overturning circulation at the start of the Bølling-Allerød interstadial, 14,700 years ago, are among the most dramatic deglacial events, but their underlying physical causes are not known. Here we show that the release of heat from warm waters in the deep North Atlantic Ocean probably triggered the Bølling-Allerød warming and reinvigoration of the Atlantic meridional overturning circulation. Our results are based on coupled radiocarbon and uranium-series dates, along with clumped isotope temperature estimates, from water column profiles of fossil deep-sea corals in a limited area of the western North Atlantic. We find that during Heinrich stadial 1 (the cool period immediately before the Bølling-Allerød interstadial), the deep ocean was about three degrees Celsius warmer than shallower waters above. This reversal of the ocean's usual thermal stratification pre-dates the Bølling-Allerød warming and must have been associated with increased salinity at depth to preserve the static stability of the water column. The depleted radiocarbon content of the warm and salty water mass implies a long-term disconnect from rapid surface exchanges, and, although uncertainties remain, is most consistent with a Southern Ocean source. The Heinrich stadial 1 ocean profile is distinct from the modern water column, that for the Last Glacial Maximum and that for the Younger Dryas, suggesting that the patterns we observe are a unique feature of the deglacial climate system. Our observations indicate that the deep ocean influenced dramatic Northern Hemisphere warming by storing heat at depth that preconditioned the system for a subsequent abrupt overturning event during the Bølling-Allerød interstadial. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=pbh&AN=96923514 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1038/nature13472 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 4 StartPage: 75 Subjects: – SubjectFull: Climate change research Type: general – SubjectFull: Carbon dioxide & the environment Type: general – SubjectFull: Glacial melting Type: general – SubjectFull: Water temperature & the environment Type: general – SubjectFull: Younger Dryas Type: general – SubjectFull: North Atlantic Region Type: general Titles: – TitleFull: Abrupt pre-Bølling-Allerød warming and circulation changes in the deep ocean. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Thiagarajan, Nivedita – PersonEntity: Name: NameFull: Subhas, Adam V. – PersonEntity: Name: NameFull: Southon, John R. – PersonEntity: Name: NameFull: Eiler, John M. – PersonEntity: Name: NameFull: Adkins, Jess F. IsPartOfRelationships: – BibEntity: Dates: – D: 03 M: 07 Text: 7/3/2014 Type: published Y: 2014 Identifiers: – Type: issn-print Value: 00280836 Numbering: – Type: volume Value: 511 – Type: issue Value: 7507 Titles: – TitleFull: Nature Type: main |
| ResultId | 1 |
