Chronology and petrology of sediment cor DAPC2
Evidence from paleoclimatic archives suggests that Earth's climate experienced rapid temperature changes associated with pronounced interhemispheric asymmetry during the last glacial period. Explanations for these climate excursions have converged on nonlinear interactions between ice sheets an...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.833177 2023-05-15T16:40:23+02:00 Chronology and petrology of sediment cor DAPC2 Knutz, Paul Cornils Zahn, Rainer Hall, Ian R LATITUDE: 59.000000 * LONGITUDE: -9.600000 2007-06-04 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.833177 https://doi.org/10.1594/PANGAEA.833177 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.833177 https://doi.org/10.1594/PANGAEA.833177 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Knutz, Paul Cornils; Zahn, Rainer; Hall, Ian R (2007): Centennial-scale variability of the British Ice Sheet: Implications for climate forcing and Atlantic meridional overturning circulation during the last deglaciation. Paleoceanography, 22(1), PA1207, https://doi.org/10.1029/2006PA001298 Dataset 2007 ftpangaea https://doi.org/10.1594/PANGAEA.833177 https://doi.org/10.1029/2006PA001298 2023-01-20T07:33:17Z Evidence from paleoclimatic archives suggests that Earth's climate experienced rapid temperature changes associated with pronounced interhemispheric asymmetry during the last glacial period. Explanations for these climate excursions have converged on nonlinear interactions between ice sheets and the ocean's thermohaline circulation, but the driving mechanism remains to be identified. Here we use multidecadal marine records of faunal, oxygen isotope, and sediment proxies from the northeast Atlantic proximal to the western margins of the last glacial British Ice Sheet (BIS) to document the coupling between ice sheet dynamics, ocean circulation, and insolation changes. The core data reveal successions of short-lived (80-100 years), high-amplitude ice-rafted debris (IRD) events that were initiated up to 2000 years before the deposition of detrital carbonate during Heinrich events (HE) 1 and 2. Progressive disintegration of the BIS 19-16 kyr before present (B.P.) occurred in response to abrupt ocean-climate warmings that impinged on the northeast Atlantic during the early deglaciation. Peak IRD deposition recurs at 180-220 year intervals plausibly involving repeated breakup of glacial tidewater margins and fringing marine ice shelves. The early deglaciation culminated in a major meltwater pulse at ~16.3 kyr B.P. followed by another discharge associated with HE1 some 300 years after. We conclude that temperature changes related to external forcing and marine heat transport caused a rapid response of the BIS and possibly other margins of the Eurasian Ice Sheet. Massive but short-lived meltwater surges influenced the Atlantic meridional overturning circulation thereby contributing to North Atlantic climate variability and bipolar climatic asymmetry. Dataset Ice Sheet Ice Shelves North Atlantic Northeast Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-9.600000,-9.600000,59.000000,59.000000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
description |
Evidence from paleoclimatic archives suggests that Earth's climate experienced rapid temperature changes associated with pronounced interhemispheric asymmetry during the last glacial period. Explanations for these climate excursions have converged on nonlinear interactions between ice sheets and the ocean's thermohaline circulation, but the driving mechanism remains to be identified. Here we use multidecadal marine records of faunal, oxygen isotope, and sediment proxies from the northeast Atlantic proximal to the western margins of the last glacial British Ice Sheet (BIS) to document the coupling between ice sheet dynamics, ocean circulation, and insolation changes. The core data reveal successions of short-lived (80-100 years), high-amplitude ice-rafted debris (IRD) events that were initiated up to 2000 years before the deposition of detrital carbonate during Heinrich events (HE) 1 and 2. Progressive disintegration of the BIS 19-16 kyr before present (B.P.) occurred in response to abrupt ocean-climate warmings that impinged on the northeast Atlantic during the early deglaciation. Peak IRD deposition recurs at 180-220 year intervals plausibly involving repeated breakup of glacial tidewater margins and fringing marine ice shelves. The early deglaciation culminated in a major meltwater pulse at ~16.3 kyr B.P. followed by another discharge associated with HE1 some 300 years after. We conclude that temperature changes related to external forcing and marine heat transport caused a rapid response of the BIS and possibly other margins of the Eurasian Ice Sheet. Massive but short-lived meltwater surges influenced the Atlantic meridional overturning circulation thereby contributing to North Atlantic climate variability and bipolar climatic asymmetry. |
format |
Dataset |
author |
Knutz, Paul Cornils Zahn, Rainer Hall, Ian R |
spellingShingle |
Knutz, Paul Cornils Zahn, Rainer Hall, Ian R Chronology and petrology of sediment cor DAPC2 |
author_facet |
Knutz, Paul Cornils Zahn, Rainer Hall, Ian R |
author_sort |
Knutz, Paul Cornils |
title |
Chronology and petrology of sediment cor DAPC2 |
title_short |
Chronology and petrology of sediment cor DAPC2 |
title_full |
Chronology and petrology of sediment cor DAPC2 |
title_fullStr |
Chronology and petrology of sediment cor DAPC2 |
title_full_unstemmed |
Chronology and petrology of sediment cor DAPC2 |
title_sort |
chronology and petrology of sediment cor dapc2 |
publisher |
PANGAEA |
publishDate |
2007 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.833177 https://doi.org/10.1594/PANGAEA.833177 |
op_coverage |
LATITUDE: 59.000000 * LONGITUDE: -9.600000 |
long_lat |
ENVELOPE(-9.600000,-9.600000,59.000000,59.000000) |
genre |
Ice Sheet Ice Shelves North Atlantic Northeast Atlantic |
genre_facet |
Ice Sheet Ice Shelves North Atlantic Northeast Atlantic |
op_source |
Supplement to: Knutz, Paul Cornils; Zahn, Rainer; Hall, Ian R (2007): Centennial-scale variability of the British Ice Sheet: Implications for climate forcing and Atlantic meridional overturning circulation during the last deglaciation. Paleoceanography, 22(1), PA1207, https://doi.org/10.1029/2006PA001298 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.833177 https://doi.org/10.1594/PANGAEA.833177 |
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.833177 https://doi.org/10.1029/2006PA001298 |
_version_ |
1766030781580312576 |