Reduced El Niño–Southern Oscillation during the Last Glacial Maximum
El Niño–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...
Main Authors: | , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
Columbia University
2015
|
Subjects: | |
Online Access: | https://dx.doi.org/10.7916/d8k073qm https://academiccommons.columbia.edu/doi/10.7916/D8K073QM |
id |
ftdatacite:10.7916/d8k073qm |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.7916/d8k073qm 2023-05-15T16:40:47+02:00 Reduced El Niño–Southern Oscillation during the Last Glacial Maximum Ford, Heather Louise Ravelo, A. Christina Polissar, Pratigya Jeremy 2015 https://dx.doi.org/10.7916/d8k073qm https://academiccommons.columbia.edu/doi/10.7916/D8K073QM unknown Columbia University https://dx.doi.org/10.1126/science.1258437 Southern oscillation Thermoclines Oceanography Paleoclimatology Atmosphere Oceanography Text Articles article-journal ScholarlyArticle 2015 ftdatacite https://doi.org/10.7916/d8k073qm https://doi.org/10.1126/science.1258437 2021-11-05T12:55:41Z El Niño–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 DataCite Metadata Store (German National Library of Science and Technology) Pacific |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Southern oscillation Thermoclines Oceanography Paleoclimatology Atmosphere Oceanography |
spellingShingle |
Southern oscillation Thermoclines Oceanography Paleoclimatology Atmosphere Oceanography Ford, Heather Louise Ravelo, A. Christina Polissar, Pratigya Jeremy Reduced El Niño–Southern Oscillation during the Last Glacial Maximum |
topic_facet |
Southern oscillation Thermoclines Oceanography Paleoclimatology Atmosphere Oceanography |
description |
El Niño–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 Louise Ravelo, A. Christina Polissar, Pratigya Jeremy |
author_facet |
Ford, Heather Louise Ravelo, A. Christina Polissar, Pratigya Jeremy |
author_sort |
Ford, Heather Louise |
title |
Reduced El Niño–Southern Oscillation during the Last Glacial Maximum |
title_short |
Reduced El Niño–Southern Oscillation during the Last Glacial Maximum |
title_full |
Reduced El Niño–Southern Oscillation during the Last Glacial Maximum |
title_fullStr |
Reduced El Niño–Southern Oscillation during the Last Glacial Maximum |
title_full_unstemmed |
Reduced El Niño–Southern Oscillation during the Last Glacial Maximum |
title_sort |
reduced el niño–southern oscillation during the last glacial maximum |
publisher |
Columbia University |
publishDate |
2015 |
url |
https://dx.doi.org/10.7916/d8k073qm https://academiccommons.columbia.edu/doi/10.7916/D8K073QM |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Ice Sheet Planktonic foraminifera |
genre_facet |
Ice Sheet Planktonic foraminifera |
op_relation |
https://dx.doi.org/10.1126/science.1258437 |
op_doi |
https://doi.org/10.7916/d8k073qm https://doi.org/10.1126/science.1258437 |
_version_ |
1766031209994911744 |