Reduced El Nino-Southern Oscillation during the Last Glacial Maximum
El Nino-Southern Oscillation (ENSO) is a major source of global interannual variability, but its response to climate change is uncertain. Paleoclimate records from the Last Glacial Maximum (LGM) provide insight into ENSO behavior when global boundary conditions (ice sheet extent, atmospheric partial...
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ftarchimer:oai:archimer.ifremer.fr:46282 2023-05-15T16:40:45+02:00 Reduced El Nino-Southern Oscillation during the Last Glacial Maximum Ford, Heather L. Ravelo, A. Christina Polissar, Pratigya J. 2015-01 application/pdf https://archimer.ifremer.fr/doc/00352/46282/45966.pdf https://doi.org/10.1126/science.1258437 https://archimer.ifremer.fr/doc/00352/46282/ eng eng Amer Assoc Advancement Science https://archimer.ifremer.fr/doc/00352/46282/45966.pdf doi:10.1126/science.1258437 https://archimer.ifremer.fr/doc/00352/46282/ Copyright 2016 by the American Association for the Advancement of Science info:eu-repo/semantics/openAccess restricted use Science (0036-8075) (Amer Assoc Advancement Science), 2015-01 , Vol. 347 , N. 6219 , P. 255-258 text Publication info:eu-repo/semantics/article 2015 ftarchimer https://doi.org/10.1126/science.1258437 2021-09-23T20:28:47Z El Nino-Southern Oscillation (ENSO) is a major source of global interannual variability, but its response to climate change is uncertain. Paleoclimate records from the Last Glacial Maximum (LGM) provide insight into ENSO behavior when global boundary conditions (ice sheet extent, atmospheric partial pressure of CO2) were different from those today. In this work, we reconstruct LGM temperature variability at equatorial Pacific sites using measurements of individual planktonic foraminifera shells. A deep equatorial thermocline altered the dynamics in the eastern equatorial cold tongue, resulting in reduced ENSO variability during the LGM compared to the Late Holocene. These results suggest that ENSO was not tied directly to the east-west temperature gradient, as previously suggested. Rather, the thermocline of the eastern equatorial Pacific played a decisive role in the ENSO response to LGM climate. Article in Journal/Newspaper Ice Sheet Planktonic foraminifera Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Pacific Science 347 6219 255 258 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
El Nino-Southern Oscillation (ENSO) is a major source of global interannual variability, but its response to climate change is uncertain. Paleoclimate records from the Last Glacial Maximum (LGM) provide insight into ENSO behavior when global boundary conditions (ice sheet extent, atmospheric partial pressure of CO2) were different from those today. In this work, we reconstruct LGM temperature variability at equatorial Pacific sites using measurements of individual planktonic foraminifera shells. A deep equatorial thermocline altered the dynamics in the eastern equatorial cold tongue, resulting in reduced ENSO variability during the LGM compared to the Late Holocene. These results suggest that ENSO was not tied directly to the east-west temperature gradient, as previously suggested. Rather, the thermocline of the eastern equatorial Pacific played a decisive role in the ENSO response to LGM climate. |
format |
Article in Journal/Newspaper |
author |
Ford, Heather L. Ravelo, A. Christina Polissar, Pratigya J. |
spellingShingle |
Ford, Heather L. Ravelo, A. Christina Polissar, Pratigya J. Reduced El Nino-Southern Oscillation during the Last Glacial Maximum |
author_facet |
Ford, Heather L. Ravelo, A. Christina Polissar, Pratigya J. |
author_sort |
Ford, Heather L. |
title |
Reduced El Nino-Southern Oscillation during the Last Glacial Maximum |
title_short |
Reduced El Nino-Southern Oscillation during the Last Glacial Maximum |
title_full |
Reduced El Nino-Southern Oscillation during the Last Glacial Maximum |
title_fullStr |
Reduced El Nino-Southern Oscillation during the Last Glacial Maximum |
title_full_unstemmed |
Reduced El Nino-Southern Oscillation during the Last Glacial Maximum |
title_sort |
reduced el nino-southern oscillation during the last glacial maximum |
publisher |
Amer Assoc Advancement Science |
publishDate |
2015 |
url |
https://archimer.ifremer.fr/doc/00352/46282/45966.pdf https://doi.org/10.1126/science.1258437 https://archimer.ifremer.fr/doc/00352/46282/ |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Ice Sheet Planktonic foraminifera |
genre_facet |
Ice Sheet Planktonic foraminifera |
op_source |
Science (0036-8075) (Amer Assoc Advancement Science), 2015-01 , Vol. 347 , N. 6219 , P. 255-258 |
op_relation |
https://archimer.ifremer.fr/doc/00352/46282/45966.pdf doi:10.1126/science.1258437 https://archimer.ifremer.fr/doc/00352/46282/ |
op_rights |
Copyright 2016 by the American Association for the Advancement of Science info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1126/science.1258437 |
container_title |
Science |
container_volume |
347 |
container_issue |
6219 |
container_start_page |
255 |
op_container_end_page |
258 |
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1766031159050895360 |