Deep-water temperature reconstruction of sediment core MD99-2334
Paired measurements of Mg/Ca and delta18O(cc) (calcite delta18O) in benthic foraminifera from a deep-sea core recovered on the Iberian Margin (MD99-2334K; 37°48'N, 10°10'W; 3,146 m) have been performed in parallel with planktonic delta18O(cc) analyses and counts of ice-rafted debris (IRD)....
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.738090 2023-05-15T13:42:10+02:00 Deep-water temperature reconstruction of sediment core MD99-2334 Skinner, Luke C Shackleton, Nicholas J Elderfield, Henry LATITUDE: 37.801167 * LONGITUDE: -10.171333 * DATE/TIME START: 1999-09-14T00:00:00 * DATE/TIME END: 1999-09-14T00:00:00 2003-05-10 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.738090 https://doi.org/10.1594/PANGAEA.738090 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.738090 https://doi.org/10.1594/PANGAEA.738090 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Skinner, Luke C; Shackleton, Nicholas J; Elderfield, Henry (2003): Millennial-scale variability of deep-water temperature and d18Odw indicating deep-water source variations in the Northeast Atlantic, 0-34 cal. ka BP. Geochemistry, Geophysics, Geosystems, 4(12), https://doi.org/10.1029/2003GC000585 90b IMAGES IMAGES V International Marine Global Change Study KAL Kasten corer Marion Dufresne (1995) MD114 MD99-2334 Dataset 2003 ftpangaea https://doi.org/10.1594/PANGAEA.738090 https://doi.org/10.1029/2003GC000585 2023-01-20T07:31:46Z Paired measurements of Mg/Ca and delta18O(cc) (calcite delta18O) in benthic foraminifera from a deep-sea core recovered on the Iberian Margin (MD99-2334K; 37°48'N, 10°10'W; 3,146 m) have been performed in parallel with planktonic delta18O(cc) analyses and counts of ice-rafted debris (IRD). The synchrony of temperature changes recorded in the Greenland ice cores and in North Atlantic planktonic delta18O(cc) allows the proxy records from MD99-2334K to be placed confidently on the GISP2 time-scale. This correlation is further corroborated by AMS 14C-dates. Benthic Mg/Ca measurements in MD99-2334K permit the reconstruction of past deep-water temperature (T(dw)) changes since ~34 cal. ka BP (calendar kiloyears before present). Using these T(dw) estimates and parallel benthic delta18O(cc) measurements, a record of deep-water delta18O (delta18O(dw)) has been calculated. Results indicate greatly reduced T(dw) in the deep Northeast Atlantic during the last glaciation until ~15 cal. ka BP, when T(dw) warmed abruptly to near-modern values in parallel with the onset of the Bølling-Allerød interstadial. Subsequently, Tdw reverted to cold glacial values between ~13.4 and ~11.4 cal. ka BP, in parallel with the Younger Dryas cold reversal and the H0 ice-rafting event. Similar millennial-scale T(dw) changes also occurred during the last glaciation. Indeed, throughout the last ~34 cal. ka, millennial delta18O(dw) and T(dw) changes have remained well coupled and are linked with IRD pulses coincident with Heinrich events 3, 2, 1, and the Younger Dryas, when transitions to lower T(dw) and delta18O(dw) conditions occurred. In general, millennial T(dw) and delta18O(dw) variations recorded in MD99-2334K describe an alternation between colder, low-delta18O(dw) and warmer, high delta18O(dw) conditions, which suggests the changing local dominance of northern-sourced North Atlantic Deep Water (NADW) versus southern-sourced Antarctic Bottom Water (AABW). The observed similarity of the T(dw) and GISP2 delta18O(ice) records would therefore ... Dataset Antarc* Antarctic Greenland Greenland ice cores NADW North Atlantic Deep Water North Atlantic Northeast Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Greenland ENVELOPE(-10.171333,-10.171333,37.801167,37.801167) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
90b IMAGES IMAGES V International Marine Global Change Study KAL Kasten corer Marion Dufresne (1995) MD114 MD99-2334 |
spellingShingle |
90b IMAGES IMAGES V International Marine Global Change Study KAL Kasten corer Marion Dufresne (1995) MD114 MD99-2334 Skinner, Luke C Shackleton, Nicholas J Elderfield, Henry Deep-water temperature reconstruction of sediment core MD99-2334 |
topic_facet |
90b IMAGES IMAGES V International Marine Global Change Study KAL Kasten corer Marion Dufresne (1995) MD114 MD99-2334 |
description |
Paired measurements of Mg/Ca and delta18O(cc) (calcite delta18O) in benthic foraminifera from a deep-sea core recovered on the Iberian Margin (MD99-2334K; 37°48'N, 10°10'W; 3,146 m) have been performed in parallel with planktonic delta18O(cc) analyses and counts of ice-rafted debris (IRD). The synchrony of temperature changes recorded in the Greenland ice cores and in North Atlantic planktonic delta18O(cc) allows the proxy records from MD99-2334K to be placed confidently on the GISP2 time-scale. This correlation is further corroborated by AMS 14C-dates. Benthic Mg/Ca measurements in MD99-2334K permit the reconstruction of past deep-water temperature (T(dw)) changes since ~34 cal. ka BP (calendar kiloyears before present). Using these T(dw) estimates and parallel benthic delta18O(cc) measurements, a record of deep-water delta18O (delta18O(dw)) has been calculated. Results indicate greatly reduced T(dw) in the deep Northeast Atlantic during the last glaciation until ~15 cal. ka BP, when T(dw) warmed abruptly to near-modern values in parallel with the onset of the Bølling-Allerød interstadial. Subsequently, Tdw reverted to cold glacial values between ~13.4 and ~11.4 cal. ka BP, in parallel with the Younger Dryas cold reversal and the H0 ice-rafting event. Similar millennial-scale T(dw) changes also occurred during the last glaciation. Indeed, throughout the last ~34 cal. ka, millennial delta18O(dw) and T(dw) changes have remained well coupled and are linked with IRD pulses coincident with Heinrich events 3, 2, 1, and the Younger Dryas, when transitions to lower T(dw) and delta18O(dw) conditions occurred. In general, millennial T(dw) and delta18O(dw) variations recorded in MD99-2334K describe an alternation between colder, low-delta18O(dw) and warmer, high delta18O(dw) conditions, which suggests the changing local dominance of northern-sourced North Atlantic Deep Water (NADW) versus southern-sourced Antarctic Bottom Water (AABW). The observed similarity of the T(dw) and GISP2 delta18O(ice) records would therefore ... |
format |
Dataset |
author |
Skinner, Luke C Shackleton, Nicholas J Elderfield, Henry |
author_facet |
Skinner, Luke C Shackleton, Nicholas J Elderfield, Henry |
author_sort |
Skinner, Luke C |
title |
Deep-water temperature reconstruction of sediment core MD99-2334 |
title_short |
Deep-water temperature reconstruction of sediment core MD99-2334 |
title_full |
Deep-water temperature reconstruction of sediment core MD99-2334 |
title_fullStr |
Deep-water temperature reconstruction of sediment core MD99-2334 |
title_full_unstemmed |
Deep-water temperature reconstruction of sediment core MD99-2334 |
title_sort |
deep-water temperature reconstruction of sediment core md99-2334 |
publisher |
PANGAEA |
publishDate |
2003 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.738090 https://doi.org/10.1594/PANGAEA.738090 |
op_coverage |
LATITUDE: 37.801167 * LONGITUDE: -10.171333 * DATE/TIME START: 1999-09-14T00:00:00 * DATE/TIME END: 1999-09-14T00:00:00 |
long_lat |
ENVELOPE(-10.171333,-10.171333,37.801167,37.801167) |
geographic |
Antarctic Greenland |
geographic_facet |
Antarctic Greenland |
genre |
Antarc* Antarctic Greenland Greenland ice cores NADW North Atlantic Deep Water North Atlantic Northeast Atlantic |
genre_facet |
Antarc* Antarctic Greenland Greenland ice cores NADW North Atlantic Deep Water North Atlantic Northeast Atlantic |
op_source |
Supplement to: Skinner, Luke C; Shackleton, Nicholas J; Elderfield, Henry (2003): Millennial-scale variability of deep-water temperature and d18Odw indicating deep-water source variations in the Northeast Atlantic, 0-34 cal. ka BP. Geochemistry, Geophysics, Geosystems, 4(12), https://doi.org/10.1029/2003GC000585 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.738090 https://doi.org/10.1594/PANGAEA.738090 |
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.738090 https://doi.org/10.1029/2003GC000585 |
_version_ |
1766163800256413696 |