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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fttriple:oai:gotriple.eu:10670/1.3lckpi 2023-05-15T16:40:47+02:00 Reduced El Nino-Southern Oscillation during the Last Glacial Maximum Ford, Heather L. Ravelo, A. Christina Polissar, Pratigya J. https://doi.org/10.1126/science.1258437 https://archimer.ifremer.fr/doc/00352/46282/45966.pdf https://archimer.ifremer.fr/doc/00352/46282/ en eng Amer Assoc Advancement Science doi:10.1126/science.1258437 10670/1.3lckpi https://archimer.ifremer.fr/doc/00352/46282/45966.pdf https://archimer.ifremer.fr/doc/00352/46282/ other Archimer, archive institutionnelle de l'Ifremer Science (0036-8075) (Amer Assoc Advancement Science), 2015-01 , Vol. 347 , N. 6219 , P. 255-258 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ fttriple https://doi.org/10.1126/science.1258437 2023-01-22T17:19:40Z 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. Text Ice Sheet Planktonic foraminifera Unknown Pacific Science 347 6219 255 258 |
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envir geo Ford, Heather L. Ravelo, A. Christina Polissar, Pratigya J. Reduced El Nino-Southern Oscillation during the Last Glacial Maximum |
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envir geo |
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 |
Text |
author |
Ford, Heather L. Ravelo, A. Christina Polissar, Pratigya J. |
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 |
url |
https://doi.org/10.1126/science.1258437 https://archimer.ifremer.fr/doc/00352/46282/45966.pdf 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 |
Archimer, archive institutionnelle de l'Ifremer Science (0036-8075) (Amer Assoc Advancement Science), 2015-01 , Vol. 347 , N. 6219 , P. 255-258 |
op_relation |
doi:10.1126/science.1258437 10670/1.3lckpi https://archimer.ifremer.fr/doc/00352/46282/45966.pdf https://archimer.ifremer.fr/doc/00352/46282/ |
op_rights |
other |
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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1766031211274174464 |