Climate proxies in sediment core MD95-2010
High-amplitude, rapid climate fluctuations are common features of glacial times. The prominent changes in air temperature recorded in the Greenland ice cores (Dansgaard et al., 1993, doi:10.1038/339532a0; Grootes et al., 1993 doi:10.1038/366552a0) are coherent with shifts in the magnitude of the nor...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.735730 2023-05-15T16:29:50+02:00 Climate proxies in sediment core MD95-2010 Dokken, Trond Jansen, Eystein LATITUDE: 66.684167 * LONGITUDE: 4.566160 * DATE/TIME START: 1995-06-07T00:00:00 * DATE/TIME END: 1995-06-07T00:00:00 1999-03-25 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.735730 https://doi.org/10.1594/PANGAEA.735730 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.735730 https://doi.org/10.1594/PANGAEA.735730 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Dokken, Trond; Jansen, Eystein (1999): Rapid changes in the mechanism of ocean convection during the last glacial period. Nature, 401(6752), 458-461, https://doi.org/10.1038/46753 CALYPSO Calypso Corer IMAGES IMAGES I International Marine Global Change Study Marion Dufresne (1995) MD101 MD952010 MD95-2010 Voring Plateau Dataset 1999 ftpangaea https://doi.org/10.1594/PANGAEA.735730 https://doi.org/10.1038/46753 2023-01-20T07:31:42Z High-amplitude, rapid climate fluctuations are common features of glacial times. The prominent changes in air temperature recorded in the Greenland ice cores (Dansgaard et al., 1993, doi:10.1038/339532a0; Grootes et al., 1993 doi:10.1038/366552a0) are coherent with shifts in the magnitude of the northward heat flux carried by the North Atlantic surface ocean (Bond et al., 1993, doi:10.1038/365143a0; Bond and Lotti, 1995, doi:10.1126/science.267.5200.1005); changes in the ocean's thermohaline circulation are a key component in many explanations of this climate flickering (Broecker, 1997, doi:10.1126/science.278.5343.1582). Here we use stable-isotope and other sedimentological data to reveal specific oceanic reorganizations during these rapid climate-change events. Deep water was generated more or less continuously in the Nordic Seas during the latter part of the last glacial period (60 to 10 thousand years ago), but by two different mechanisms. The deep-water formation occurred by convection in the open ocean during warmer periods (interstadials). But during colder phases (stadials), a freshening of the surface ocean reduced or stopped open-ocean convection, and deep-water formation was instead driven by brine-release during sea-ice freezing. These shifting magnitudes and modes nested within the overall continuity of deep-water formation were probably important for the structuring and rapidity of the prevailing climate changes. Dataset Greenland Greenland ice cores Nordic Seas North Atlantic Sea ice PANGAEA - Data Publisher for Earth & Environmental Science Greenland ENVELOPE(4.566160,4.566160,66.684167,66.684167) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
CALYPSO Calypso Corer IMAGES IMAGES I International Marine Global Change Study Marion Dufresne (1995) MD101 MD952010 MD95-2010 Voring Plateau |
spellingShingle |
CALYPSO Calypso Corer IMAGES IMAGES I International Marine Global Change Study Marion Dufresne (1995) MD101 MD952010 MD95-2010 Voring Plateau Dokken, Trond Jansen, Eystein Climate proxies in sediment core MD95-2010 |
topic_facet |
CALYPSO Calypso Corer IMAGES IMAGES I International Marine Global Change Study Marion Dufresne (1995) MD101 MD952010 MD95-2010 Voring Plateau |
description |
High-amplitude, rapid climate fluctuations are common features of glacial times. The prominent changes in air temperature recorded in the Greenland ice cores (Dansgaard et al., 1993, doi:10.1038/339532a0; Grootes et al., 1993 doi:10.1038/366552a0) are coherent with shifts in the magnitude of the northward heat flux carried by the North Atlantic surface ocean (Bond et al., 1993, doi:10.1038/365143a0; Bond and Lotti, 1995, doi:10.1126/science.267.5200.1005); changes in the ocean's thermohaline circulation are a key component in many explanations of this climate flickering (Broecker, 1997, doi:10.1126/science.278.5343.1582). Here we use stable-isotope and other sedimentological data to reveal specific oceanic reorganizations during these rapid climate-change events. Deep water was generated more or less continuously in the Nordic Seas during the latter part of the last glacial period (60 to 10 thousand years ago), but by two different mechanisms. The deep-water formation occurred by convection in the open ocean during warmer periods (interstadials). But during colder phases (stadials), a freshening of the surface ocean reduced or stopped open-ocean convection, and deep-water formation was instead driven by brine-release during sea-ice freezing. These shifting magnitudes and modes nested within the overall continuity of deep-water formation were probably important for the structuring and rapidity of the prevailing climate changes. |
format |
Dataset |
author |
Dokken, Trond Jansen, Eystein |
author_facet |
Dokken, Trond Jansen, Eystein |
author_sort |
Dokken, Trond |
title |
Climate proxies in sediment core MD95-2010 |
title_short |
Climate proxies in sediment core MD95-2010 |
title_full |
Climate proxies in sediment core MD95-2010 |
title_fullStr |
Climate proxies in sediment core MD95-2010 |
title_full_unstemmed |
Climate proxies in sediment core MD95-2010 |
title_sort |
climate proxies in sediment core md95-2010 |
publisher |
PANGAEA |
publishDate |
1999 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.735730 https://doi.org/10.1594/PANGAEA.735730 |
op_coverage |
LATITUDE: 66.684167 * LONGITUDE: 4.566160 * DATE/TIME START: 1995-06-07T00:00:00 * DATE/TIME END: 1995-06-07T00:00:00 |
long_lat |
ENVELOPE(4.566160,4.566160,66.684167,66.684167) |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice cores Nordic Seas North Atlantic Sea ice |
genre_facet |
Greenland Greenland ice cores Nordic Seas North Atlantic Sea ice |
op_source |
Supplement to: Dokken, Trond; Jansen, Eystein (1999): Rapid changes in the mechanism of ocean convection during the last glacial period. Nature, 401(6752), 458-461, https://doi.org/10.1038/46753 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.735730 https://doi.org/10.1594/PANGAEA.735730 |
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.735730 https://doi.org/10.1038/46753 |
_version_ |
1766019541864808448 |