Age model, alkenones and stable isotopes of sediment core MSM45-31-1 (MSM45_431-1)
The Labrador Sea is important for the modern global thermohaline circulation system through the formation of intermediate Labrador Sea Water (LSW) that has been hypothesized to stabilize the modern mode of North Atlantic deep-water circulation. The rate of LSW formation is controlled by the amount o...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.904693 2023-05-15T16:30:38+02:00 Age model, alkenones and stable isotopes of sediment core MSM45-31-1 (MSM45_431-1) Lochte, Annalena Antonia Schneider, Ralph R Kienast, Markus Repschläger, Janne Blanz, Thomas Garbe-Schönberg, Dieter Andersen, Nils LATITUDE: 54.412330 * LONGITUDE: -56.008830 * DATE/TIME START: 2015-08-14T11:12:00 * DATE/TIME END: 2015-08-14T11:12:00 2019-08-08 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.904693 https://doi.org/10.1594/PANGAEA.904693 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.904693 https://doi.org/10.1594/PANGAEA.904693 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Lochte, Annalena Antonia; Schneider, Ralph R; Kienast, Markus; Repschläger, Janne; Blanz, Thomas; Garbe-Schönberg, Dieter; Andersen, Nils (2020): Surface and subsurface Labrador Shelf water mass conditions during the last 6000 years. Climate of the Past, 16(4), 1127-1143, https://doi.org/10.5194/cp-16-1127-2020 031-1 alkenones GC Gravity corer Labrador Sea Maria S. Merian Mg/Ca paleothermometry MSM45 MSM45_431-1 Stable isotopes Dataset 2019 ftpangaea https://doi.org/10.1594/PANGAEA.904693 https://doi.org/10.5194/cp-16-1127-2020 2023-01-20T07:34:22Z The Labrador Sea is important for the modern global thermohaline circulation system through the formation of intermediate Labrador Sea Water (LSW) that has been hypothesized to stabilize the modern mode of North Atlantic deep-water circulation. The rate of LSW formation is controlled by the amount of winter heat loss to the atmosphere, the expanse of freshwater in the convection region and the inflow of saline waters from the Atlantic. The Labrador Sea, today, receives freshwater through the East and West Greenland Currents (EGC, WGC) and the Labrador Current (LC). Several studies have suggested the WGC to be the main supplier of freshwater to the Labrador Sea, but the role of the southward flowing LC in Labrador Sea convection is still debated. At the same time, many paleoceanographic reconstructions from the Labrador Shelf focussed on late Deglacial to early Holocene meltwater run-off from the Laurentide Ice Sheet (LIS), whereas little information exists about LC variability since the final melting of the LIS about 7,000 years ago. In order to enable better assessment of the role of the LC in deep-water formation and its importance for Holocene climate variability in Atlantic Canada, this study presents high-resolution middle to late Holocene records of sea surface and bottom water temperatures, freshening and sea ice cover on the Labrador Shelf during the last 6,000 years. Our records reveal that the LC underwent three major oceanographic phases from the Mid- to Late Holocene. From 6.2 to 5.6 ka BP, the LC experienced a cold episode that was followed by warmer conditions between 5.6 and 2.1 ka BP, possibly associated with the late Holocene Thermal Maximum. Although surface waters on the Labrador Shelf cooled gradually after 3 ka BP in response to the Neoglaciation, Labrador Shelf subsurface/bottom waters show a shift to warmer temperatures after 2.1 ka BP. Although such an inverse stratification by cooling of surface and warming of subsurface waters on the Labrador Shelf would suggest a diminished convection ... Dataset Greenland Ice Sheet Labrador Sea North Atlantic Deep Water North Atlantic Sea ice PANGAEA - Data Publisher for Earth & Environmental Science Canada Greenland Labrador Shelf ENVELOPE(-58.000,-58.000,56.000,56.000) ENVELOPE(-56.008830,-56.008830,54.412330,54.412330) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
031-1 alkenones GC Gravity corer Labrador Sea Maria S. Merian Mg/Ca paleothermometry MSM45 MSM45_431-1 Stable isotopes |
spellingShingle |
031-1 alkenones GC Gravity corer Labrador Sea Maria S. Merian Mg/Ca paleothermometry MSM45 MSM45_431-1 Stable isotopes Lochte, Annalena Antonia Schneider, Ralph R Kienast, Markus Repschläger, Janne Blanz, Thomas Garbe-Schönberg, Dieter Andersen, Nils Age model, alkenones and stable isotopes of sediment core MSM45-31-1 (MSM45_431-1) |
topic_facet |
031-1 alkenones GC Gravity corer Labrador Sea Maria S. Merian Mg/Ca paleothermometry MSM45 MSM45_431-1 Stable isotopes |
description |
The Labrador Sea is important for the modern global thermohaline circulation system through the formation of intermediate Labrador Sea Water (LSW) that has been hypothesized to stabilize the modern mode of North Atlantic deep-water circulation. The rate of LSW formation is controlled by the amount of winter heat loss to the atmosphere, the expanse of freshwater in the convection region and the inflow of saline waters from the Atlantic. The Labrador Sea, today, receives freshwater through the East and West Greenland Currents (EGC, WGC) and the Labrador Current (LC). Several studies have suggested the WGC to be the main supplier of freshwater to the Labrador Sea, but the role of the southward flowing LC in Labrador Sea convection is still debated. At the same time, many paleoceanographic reconstructions from the Labrador Shelf focussed on late Deglacial to early Holocene meltwater run-off from the Laurentide Ice Sheet (LIS), whereas little information exists about LC variability since the final melting of the LIS about 7,000 years ago. In order to enable better assessment of the role of the LC in deep-water formation and its importance for Holocene climate variability in Atlantic Canada, this study presents high-resolution middle to late Holocene records of sea surface and bottom water temperatures, freshening and sea ice cover on the Labrador Shelf during the last 6,000 years. Our records reveal that the LC underwent three major oceanographic phases from the Mid- to Late Holocene. From 6.2 to 5.6 ka BP, the LC experienced a cold episode that was followed by warmer conditions between 5.6 and 2.1 ka BP, possibly associated with the late Holocene Thermal Maximum. Although surface waters on the Labrador Shelf cooled gradually after 3 ka BP in response to the Neoglaciation, Labrador Shelf subsurface/bottom waters show a shift to warmer temperatures after 2.1 ka BP. Although such an inverse stratification by cooling of surface and warming of subsurface waters on the Labrador Shelf would suggest a diminished convection ... |
format |
Dataset |
author |
Lochte, Annalena Antonia Schneider, Ralph R Kienast, Markus Repschläger, Janne Blanz, Thomas Garbe-Schönberg, Dieter Andersen, Nils |
author_facet |
Lochte, Annalena Antonia Schneider, Ralph R Kienast, Markus Repschläger, Janne Blanz, Thomas Garbe-Schönberg, Dieter Andersen, Nils |
author_sort |
Lochte, Annalena Antonia |
title |
Age model, alkenones and stable isotopes of sediment core MSM45-31-1 (MSM45_431-1) |
title_short |
Age model, alkenones and stable isotopes of sediment core MSM45-31-1 (MSM45_431-1) |
title_full |
Age model, alkenones and stable isotopes of sediment core MSM45-31-1 (MSM45_431-1) |
title_fullStr |
Age model, alkenones and stable isotopes of sediment core MSM45-31-1 (MSM45_431-1) |
title_full_unstemmed |
Age model, alkenones and stable isotopes of sediment core MSM45-31-1 (MSM45_431-1) |
title_sort |
age model, alkenones and stable isotopes of sediment core msm45-31-1 (msm45_431-1) |
publisher |
PANGAEA |
publishDate |
2019 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.904693 https://doi.org/10.1594/PANGAEA.904693 |
op_coverage |
LATITUDE: 54.412330 * LONGITUDE: -56.008830 * DATE/TIME START: 2015-08-14T11:12:00 * DATE/TIME END: 2015-08-14T11:12:00 |
long_lat |
ENVELOPE(-58.000,-58.000,56.000,56.000) ENVELOPE(-56.008830,-56.008830,54.412330,54.412330) |
geographic |
Canada Greenland Labrador Shelf |
geographic_facet |
Canada Greenland Labrador Shelf |
genre |
Greenland Ice Sheet Labrador Sea North Atlantic Deep Water North Atlantic Sea ice |
genre_facet |
Greenland Ice Sheet Labrador Sea North Atlantic Deep Water North Atlantic Sea ice |
op_source |
Supplement to: Lochte, Annalena Antonia; Schneider, Ralph R; Kienast, Markus; Repschläger, Janne; Blanz, Thomas; Garbe-Schönberg, Dieter; Andersen, Nils (2020): Surface and subsurface Labrador Shelf water mass conditions during the last 6000 years. Climate of the Past, 16(4), 1127-1143, https://doi.org/10.5194/cp-16-1127-2020 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.904693 https://doi.org/10.1594/PANGAEA.904693 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.904693 https://doi.org/10.5194/cp-16-1127-2020 |
_version_ |
1766020368102850560 |