Subtropical Atlantic salinity variability and Atlantic meridional circulation during the last deglaciation
During the last deglaciation (ca. 21–10 ka), freshening of the North Atlantic surface likely caused reductions in Atlantic meridional overturning circulation (AMOC); the mechanisms related to AMOC recovery remain poorly understood. Here we present three new deglacial surface temperature and δ18Oseaw...
Published in: | Geology |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Geological Society of America
2008
|
Subjects: | |
Online Access: | https://authors.library.caltech.edu/12866/ https://authors.library.caltech.edu/12866/1/CARg08.pdf https://authors.library.caltech.edu/12866/2/CARg08supp.pdf https://resolver.caltech.edu/CaltechAUTHORS:CARg08 |
id |
ftcaltechauth:oai:authors.library.caltech.edu:12866 |
---|---|
record_format |
openpolar |
spelling |
ftcaltechauth:oai:authors.library.caltech.edu:12866 2023-05-15T17:32:12+02:00 Subtropical Atlantic salinity variability and Atlantic meridional circulation during the last deglaciation Carlson, Anders E. Oppo, Delia W. Came, Rosemarie E. LeGrande, Allegra N. Keigwin, Lloyd D. Curry, William B. 2008-12 application/pdf https://authors.library.caltech.edu/12866/ https://authors.library.caltech.edu/12866/1/CARg08.pdf https://authors.library.caltech.edu/12866/2/CARg08supp.pdf https://resolver.caltech.edu/CaltechAUTHORS:CARg08 en eng Geological Society of America https://authors.library.caltech.edu/12866/1/CARg08.pdf https://authors.library.caltech.edu/12866/2/CARg08supp.pdf Carlson, Anders E. and Oppo, Delia W. and Came, Rosemarie E. and LeGrande, Allegra N. and Keigwin, Lloyd D. and Curry, William B. (2008) Subtropical Atlantic salinity variability and Atlantic meridional circulation during the last deglaciation. Geology, 36 (12). pp. 991-994. ISSN 0091-7613. doi:10.1130/G25080A.1. https://resolver.caltech.edu/CaltechAUTHORS:CARg08 <https://resolver.caltech.edu/CaltechAUTHORS:CARg08> other Article PeerReviewed 2008 ftcaltechauth https://doi.org/10.1130/G25080A.1 2021-11-11T18:41:37Z During the last deglaciation (ca. 21–10 ka), freshening of the North Atlantic surface likely caused reductions in Atlantic meridional overturning circulation (AMOC); the mechanisms related to AMOC recovery remain poorly understood. Here we present three new deglacial surface temperature and δ18Oseawater (δ18Osw) reconstructions from the western subtropical North and South Atlantic. Similarities to tropical Caribbean and western Atlantic δ18Osw records suggest that a salty surface water mass accumulated in the western Atlantic from 27°S to 33°N during periods of reduced AMOC. However, δ18Osw decreases led deep AMOC resumption by hundreds of years. We suggest that the northward export of salt previously trapped in the western Atlantic resulted in the early establishment of a shallow overturning circulation that eventually culminated in deep AMOC resumption, implying that AMOC may constitute a self-limiting system. Article in Journal/Newspaper North Atlantic Caltech Authors (California Institute of Technology) Geology 36 12 991 |
institution |
Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
English |
description |
During the last deglaciation (ca. 21–10 ka), freshening of the North Atlantic surface likely caused reductions in Atlantic meridional overturning circulation (AMOC); the mechanisms related to AMOC recovery remain poorly understood. Here we present three new deglacial surface temperature and δ18Oseawater (δ18Osw) reconstructions from the western subtropical North and South Atlantic. Similarities to tropical Caribbean and western Atlantic δ18Osw records suggest that a salty surface water mass accumulated in the western Atlantic from 27°S to 33°N during periods of reduced AMOC. However, δ18Osw decreases led deep AMOC resumption by hundreds of years. We suggest that the northward export of salt previously trapped in the western Atlantic resulted in the early establishment of a shallow overturning circulation that eventually culminated in deep AMOC resumption, implying that AMOC may constitute a self-limiting system. |
format |
Article in Journal/Newspaper |
author |
Carlson, Anders E. Oppo, Delia W. Came, Rosemarie E. LeGrande, Allegra N. Keigwin, Lloyd D. Curry, William B. |
spellingShingle |
Carlson, Anders E. Oppo, Delia W. Came, Rosemarie E. LeGrande, Allegra N. Keigwin, Lloyd D. Curry, William B. Subtropical Atlantic salinity variability and Atlantic meridional circulation during the last deglaciation |
author_facet |
Carlson, Anders E. Oppo, Delia W. Came, Rosemarie E. LeGrande, Allegra N. Keigwin, Lloyd D. Curry, William B. |
author_sort |
Carlson, Anders E. |
title |
Subtropical Atlantic salinity variability and Atlantic meridional circulation during the last deglaciation |
title_short |
Subtropical Atlantic salinity variability and Atlantic meridional circulation during the last deglaciation |
title_full |
Subtropical Atlantic salinity variability and Atlantic meridional circulation during the last deglaciation |
title_fullStr |
Subtropical Atlantic salinity variability and Atlantic meridional circulation during the last deglaciation |
title_full_unstemmed |
Subtropical Atlantic salinity variability and Atlantic meridional circulation during the last deglaciation |
title_sort |
subtropical atlantic salinity variability and atlantic meridional circulation during the last deglaciation |
publisher |
Geological Society of America |
publishDate |
2008 |
url |
https://authors.library.caltech.edu/12866/ https://authors.library.caltech.edu/12866/1/CARg08.pdf https://authors.library.caltech.edu/12866/2/CARg08supp.pdf https://resolver.caltech.edu/CaltechAUTHORS:CARg08 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://authors.library.caltech.edu/12866/1/CARg08.pdf https://authors.library.caltech.edu/12866/2/CARg08supp.pdf Carlson, Anders E. and Oppo, Delia W. and Came, Rosemarie E. and LeGrande, Allegra N. and Keigwin, Lloyd D. and Curry, William B. (2008) Subtropical Atlantic salinity variability and Atlantic meridional circulation during the last deglaciation. Geology, 36 (12). pp. 991-994. ISSN 0091-7613. doi:10.1130/G25080A.1. https://resolver.caltech.edu/CaltechAUTHORS:CARg08 <https://resolver.caltech.edu/CaltechAUTHORS:CARg08> |
op_rights |
other |
op_doi |
https://doi.org/10.1130/G25080A.1 |
container_title |
Geology |
container_volume |
36 |
container_issue |
12 |
container_start_page |
991 |
_version_ |
1766130207503155200 |