Oxygen isotopic measurements from Holcene of sediment core MD02-2529, tropical pacific
Changes in El Niño-Southern Oscillation (ENSO) variability are difficult to extract from paleoceanographic reconstructions because they are superimposed on changes in seasonal variability that modulate the first-order climate signal. Here we address this problem by reconstructing thermocline structu...
Main Authors: | , , , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2009
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.759995 https://doi.org/10.1594/PANGAEA.759995 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.759995 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.759995 2023-05-15T18:00:59+02:00 Oxygen isotopic measurements from Holcene of sediment core MD02-2529, tropical pacific Leduc, Guillaume Vidal, Laurence Cartapanis, Olivier Bard, Edouard LATITUDE: 8.205500 * LONGITUDE: -84.122000 * DATE/TIME START: 2002-06-23T05:05:00 * DATE/TIME END: 2002-06-23T05:05:00 * MINIMUM DEPTH, sediment/rock: 0.61 m * MAXIMUM DEPTH, sediment/rock: 9.84 m 2009-05-03 text/tab-separated-values, 610 data points https://doi.pangaea.de/10.1594/PANGAEA.759995 https://doi.org/10.1594/PANGAEA.759995 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.759995 https://doi.org/10.1594/PANGAEA.759995 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Leduc, Guillaume; Vidal, Laurence; Cartapanis, Olivier; Bard, Edouard (2009): Modes of eastern equatorial Pacific thermocline variability: Implications for ENSO dynamics over the last glacial period. Paleoceanography, 24(3), PA3202, https://doi.org/10.1029/2008PA001701 AGE Cocos Ridge DEPTH sediment/rock Giant piston corer GPC IMAGES IMAGES VIII - MONA International Marine Global Change Study Isotope ratio mass spectrometry Marion Dufresne (1995) MD022529 MD02-2529 MD126 Neogloboquadrina dutertrei δ18O Dataset 2009 ftpangaea https://doi.org/10.1594/PANGAEA.759995 https://doi.org/10.1029/2008PA001701 2023-01-20T08:52:09Z Changes in El Niño-Southern Oscillation (ENSO) variability are difficult to extract from paleoceanographic reconstructions because they are superimposed on changes in seasonal variability that modulate the first-order climate signal. Here we address this problem by reconstructing thermocline structure from a marine sediment core retrieved from the eastern equatorial Pacific. At the core location, changes in hydrologic parameters within the thermocline are linked to ENSO activity, with a reduced influence of seasonal variability compared to surface waters. We performed repeated isotopic analyses (d18O) on single specimens of the thermocline-dwelling planktonic foraminifera Neogloboquadrina dutertrei at several targeted time periods over the last 50 ka to extract the total thermocline variance, a parameter supposed to reveal changes in ENSO. No fundamental changes in amplitude and frequency of the events were detected despite differences in climatic background. However, our data suggest that long-term variations in the thermocline variability occurred over the last 50 ka, with the highest and lowest ENSO activities occurring during the last glacial period and the Last Glacial Maximum, respectively. Dataset Planktonic foraminifera PANGAEA - Data Publisher for Earth & Environmental Science Pacific ENVELOPE(-84.122000,-84.122000,8.205500,8.205500) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
AGE Cocos Ridge DEPTH sediment/rock Giant piston corer GPC IMAGES IMAGES VIII - MONA International Marine Global Change Study Isotope ratio mass spectrometry Marion Dufresne (1995) MD022529 MD02-2529 MD126 Neogloboquadrina dutertrei δ18O |
spellingShingle |
AGE Cocos Ridge DEPTH sediment/rock Giant piston corer GPC IMAGES IMAGES VIII - MONA International Marine Global Change Study Isotope ratio mass spectrometry Marion Dufresne (1995) MD022529 MD02-2529 MD126 Neogloboquadrina dutertrei δ18O Leduc, Guillaume Vidal, Laurence Cartapanis, Olivier Bard, Edouard Oxygen isotopic measurements from Holcene of sediment core MD02-2529, tropical pacific |
topic_facet |
AGE Cocos Ridge DEPTH sediment/rock Giant piston corer GPC IMAGES IMAGES VIII - MONA International Marine Global Change Study Isotope ratio mass spectrometry Marion Dufresne (1995) MD022529 MD02-2529 MD126 Neogloboquadrina dutertrei δ18O |
description |
Changes in El Niño-Southern Oscillation (ENSO) variability are difficult to extract from paleoceanographic reconstructions because they are superimposed on changes in seasonal variability that modulate the first-order climate signal. Here we address this problem by reconstructing thermocline structure from a marine sediment core retrieved from the eastern equatorial Pacific. At the core location, changes in hydrologic parameters within the thermocline are linked to ENSO activity, with a reduced influence of seasonal variability compared to surface waters. We performed repeated isotopic analyses (d18O) on single specimens of the thermocline-dwelling planktonic foraminifera Neogloboquadrina dutertrei at several targeted time periods over the last 50 ka to extract the total thermocline variance, a parameter supposed to reveal changes in ENSO. No fundamental changes in amplitude and frequency of the events were detected despite differences in climatic background. However, our data suggest that long-term variations in the thermocline variability occurred over the last 50 ka, with the highest and lowest ENSO activities occurring during the last glacial period and the Last Glacial Maximum, respectively. |
format |
Dataset |
author |
Leduc, Guillaume Vidal, Laurence Cartapanis, Olivier Bard, Edouard |
author_facet |
Leduc, Guillaume Vidal, Laurence Cartapanis, Olivier Bard, Edouard |
author_sort |
Leduc, Guillaume |
title |
Oxygen isotopic measurements from Holcene of sediment core MD02-2529, tropical pacific |
title_short |
Oxygen isotopic measurements from Holcene of sediment core MD02-2529, tropical pacific |
title_full |
Oxygen isotopic measurements from Holcene of sediment core MD02-2529, tropical pacific |
title_fullStr |
Oxygen isotopic measurements from Holcene of sediment core MD02-2529, tropical pacific |
title_full_unstemmed |
Oxygen isotopic measurements from Holcene of sediment core MD02-2529, tropical pacific |
title_sort |
oxygen isotopic measurements from holcene of sediment core md02-2529, tropical pacific |
publisher |
PANGAEA |
publishDate |
2009 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.759995 https://doi.org/10.1594/PANGAEA.759995 |
op_coverage |
LATITUDE: 8.205500 * LONGITUDE: -84.122000 * DATE/TIME START: 2002-06-23T05:05:00 * DATE/TIME END: 2002-06-23T05:05:00 * MINIMUM DEPTH, sediment/rock: 0.61 m * MAXIMUM DEPTH, sediment/rock: 9.84 m |
long_lat |
ENVELOPE(-84.122000,-84.122000,8.205500,8.205500) |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Supplement to: Leduc, Guillaume; Vidal, Laurence; Cartapanis, Olivier; Bard, Edouard (2009): Modes of eastern equatorial Pacific thermocline variability: Implications for ENSO dynamics over the last glacial period. Paleoceanography, 24(3), PA3202, https://doi.org/10.1029/2008PA001701 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.759995 https://doi.org/10.1594/PANGAEA.759995 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.759995 https://doi.org/10.1029/2008PA001701 |
_version_ |
1766170284659834880 |