Antarctic Holocene climate change: A benthic foraminiferal stable isotope record from Palmer Deep
The first moderate- to high-resolution Holocene marine stable isotope record from the nearshore Antarctic continental shelf (Ocean Drilling Program (ODP) Hole 1098B) suggests sensitivity of the western Antarctic Peninsula hydrography to westerly wind strength and El Nino-Southern Oscillation (ENSO)-...
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ftucl:oai:eprints.ucl.ac.uk.OAI2:11203 2023-12-24T10:08:58+01:00 Antarctic Holocene climate change: A benthic foraminiferal stable isotope record from Palmer Deep Shevenell, AE Kennett, JP 2002-03 application/pdf https://discovery.ucl.ac.uk/id/eprint/11203/1/2000PA000596.pdf https://discovery.ucl.ac.uk/id/eprint/11203/ eng eng AMER GEOPHYSICAL UNION https://discovery.ucl.ac.uk/id/eprint/11203/1/2000PA000596.pdf https://discovery.ucl.ac.uk/id/eprint/11203/ open Paleoceanography , 17 (2) , Article 1019. (2002) Antarctic paleoceanography Stable isotopes Holocene Climate change Benthic foraminifera Peninsula continental-shelf Greenland ice-core Southern-ocean Sea-ice North-Atlantic Last deglaciation Warm period Ross sea El-Nino Variability Article 2002 ftucl 2023-11-27T13:07:36Z The first moderate- to high-resolution Holocene marine stable isotope record from the nearshore Antarctic continental shelf (Ocean Drilling Program (ODP) Hole 1098B) suggests sensitivity of the western Antarctic Peninsula hydrography to westerly wind strength and El Nino-Southern Oscillation (ENSO)-like climate variability. Despite proximity to corrosive Antarctic water masses, sufficient CaCO3 in Palmer Deep sediments exists to provide a high-quality stable isotopic record (especially in the late Holocene). Coherence of benthic foraminifer delta(18)O, delta(13)C, sedimentologic, and CaCO3 fluctuations suggests that rapid (<20 years) Palmer Deep bottom water temperature fluctuations of 1&DEG;-1.5&DEG;C are associated with competitive interactions between two dominant oceanographic/climatic states. An abrupt shift from a warmer, stable Upper Circumpolar Deep Water (UCDW) state to a cooler, variable shelf water state occurred at &SIM;3.6 ka. Palmer Deep bottom waters oscillated between UCDW and shelf water-dominated states between &SIM;3.6 and 0.05 ka. Cool shelf water intervals correlate with Neoglacial events, the most recent and largest being the Little Ice Age (LIA; &SIM;0.7-0.2 ka). Similarities between Palmer Deep and global Holocene records and the rapidity of inferred bottom water fluctuations suggest that western Antarctic Peninsula shelf hydrography has not been controlled by thermohaline reorganizations but by variable strength and/or position of the Southern Hemisphere westerly wind field. We suggest that these atmospheric perturbations may have originated in the low-latitude tropical Pacific. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Greenland Greenland ice core ice core North Atlantic Ross Sea Sea ice Southern Ocean University College London: UCL Discovery Antarctic Southern Ocean Antarctic Peninsula Ross Sea Greenland Pacific Palmer Deep ENVELOPE(-64.400,-64.400,-64.950,-64.950) |
institution |
Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
English |
topic |
Antarctic paleoceanography Stable isotopes Holocene Climate change Benthic foraminifera Peninsula continental-shelf Greenland ice-core Southern-ocean Sea-ice North-Atlantic Last deglaciation Warm period Ross sea El-Nino Variability |
spellingShingle |
Antarctic paleoceanography Stable isotopes Holocene Climate change Benthic foraminifera Peninsula continental-shelf Greenland ice-core Southern-ocean Sea-ice North-Atlantic Last deglaciation Warm period Ross sea El-Nino Variability Shevenell, AE Kennett, JP Antarctic Holocene climate change: A benthic foraminiferal stable isotope record from Palmer Deep |
topic_facet |
Antarctic paleoceanography Stable isotopes Holocene Climate change Benthic foraminifera Peninsula continental-shelf Greenland ice-core Southern-ocean Sea-ice North-Atlantic Last deglaciation Warm period Ross sea El-Nino Variability |
description |
The first moderate- to high-resolution Holocene marine stable isotope record from the nearshore Antarctic continental shelf (Ocean Drilling Program (ODP) Hole 1098B) suggests sensitivity of the western Antarctic Peninsula hydrography to westerly wind strength and El Nino-Southern Oscillation (ENSO)-like climate variability. Despite proximity to corrosive Antarctic water masses, sufficient CaCO3 in Palmer Deep sediments exists to provide a high-quality stable isotopic record (especially in the late Holocene). Coherence of benthic foraminifer delta(18)O, delta(13)C, sedimentologic, and CaCO3 fluctuations suggests that rapid (<20 years) Palmer Deep bottom water temperature fluctuations of 1&DEG;-1.5&DEG;C are associated with competitive interactions between two dominant oceanographic/climatic states. An abrupt shift from a warmer, stable Upper Circumpolar Deep Water (UCDW) state to a cooler, variable shelf water state occurred at &SIM;3.6 ka. Palmer Deep bottom waters oscillated between UCDW and shelf water-dominated states between &SIM;3.6 and 0.05 ka. Cool shelf water intervals correlate with Neoglacial events, the most recent and largest being the Little Ice Age (LIA; &SIM;0.7-0.2 ka). Similarities between Palmer Deep and global Holocene records and the rapidity of inferred bottom water fluctuations suggest that western Antarctic Peninsula shelf hydrography has not been controlled by thermohaline reorganizations but by variable strength and/or position of the Southern Hemisphere westerly wind field. We suggest that these atmospheric perturbations may have originated in the low-latitude tropical Pacific. |
format |
Article in Journal/Newspaper |
author |
Shevenell, AE Kennett, JP |
author_facet |
Shevenell, AE Kennett, JP |
author_sort |
Shevenell, AE |
title |
Antarctic Holocene climate change: A benthic foraminiferal stable isotope record from Palmer Deep |
title_short |
Antarctic Holocene climate change: A benthic foraminiferal stable isotope record from Palmer Deep |
title_full |
Antarctic Holocene climate change: A benthic foraminiferal stable isotope record from Palmer Deep |
title_fullStr |
Antarctic Holocene climate change: A benthic foraminiferal stable isotope record from Palmer Deep |
title_full_unstemmed |
Antarctic Holocene climate change: A benthic foraminiferal stable isotope record from Palmer Deep |
title_sort |
antarctic holocene climate change: a benthic foraminiferal stable isotope record from palmer deep |
publisher |
AMER GEOPHYSICAL UNION |
publishDate |
2002 |
url |
https://discovery.ucl.ac.uk/id/eprint/11203/1/2000PA000596.pdf https://discovery.ucl.ac.uk/id/eprint/11203/ |
long_lat |
ENVELOPE(-64.400,-64.400,-64.950,-64.950) |
geographic |
Antarctic Southern Ocean Antarctic Peninsula Ross Sea Greenland Pacific Palmer Deep |
geographic_facet |
Antarctic Southern Ocean Antarctic Peninsula Ross Sea Greenland Pacific Palmer Deep |
genre |
Antarc* Antarctic Antarctic Peninsula Greenland Greenland ice core ice core North Atlantic Ross Sea Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Greenland Greenland ice core ice core North Atlantic Ross Sea Sea ice Southern Ocean |
op_source |
Paleoceanography , 17 (2) , Article 1019. (2002) |
op_relation |
https://discovery.ucl.ac.uk/id/eprint/11203/1/2000PA000596.pdf https://discovery.ucl.ac.uk/id/eprint/11203/ |
op_rights |
open |
_version_ |
1786205076214251520 |