Stable carbon and oxygen isotope ratios of foraminifera from Holocene sediments of the North Atlantic
The Denmark Strait Overflow (DSO) today compensates for the northward flowing Norwegian and Irminger branches of the North Atlantic Current that drive the Nordic heat pump. During the Last Glacial Maximum (LGM), ice sheets constricted the Denmark Strait aperture in addition to ice eustatic/isostatic...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.727694 2023-05-15T16:00:37+02:00 Stable carbon and oxygen isotope ratios of foraminifera from Holocene sediments of the North Atlantic Millo, Christian Sarnthein, Michael Voelker, Antje H L Erlenkeuser, Helmut MEDIAN LATITUDE: 64.150747 * MEDIAN LONGITUDE: -32.362020 * SOUTH-BOUND LATITUDE: 61.526000 * WEST-BOUND LONGITUDE: -39.067500 * NORTH-BOUND LATITUDE: 67.930900 * EAST-BOUND LONGITUDE: -25.426500 * DATE/TIME START: 1995-08-18T00:00:00 * DATE/TIME END: 2002-07-06T00:44:00 2006-09-22 application/zip, 5 datasets https://doi.pangaea.de/10.1594/PANGAEA.727694 https://doi.org/10.1594/PANGAEA.727694 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.727694 https://doi.org/10.1594/PANGAEA.727694 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Millo, Christian; Sarnthein, Michael; Voelker, Antje H L; Erlenkeuser, Helmut (2006): Variability of the Denmark Strait Overflow during the Last Glacial Maximum. Boreas, 35(1), 50-60, https://doi.org/10.1111/j.1502-3885.2006.tb01112.x ARK-XVIII/1 Giant box corer GIK23519-4 GIK23519-5 GKG Gravity corer (Kiel type) Greenland Sea Iceland Sea Impact of Gateways on Ocean Circulation Climate and Evolution OceanGateways Ocean Gateways Oceanpassagen PC Piston corer Polarstern POS210/2 Poseidon PS62 PS62/003-2 PS62/004-3 PS62/015-3 SL Dataset 2006 ftpangaea https://doi.org/10.1594/PANGAEA.727694 https://doi.org/10.1111/j.1502-3885.2006.tb01112.x 2023-01-20T07:31:30Z The Denmark Strait Overflow (DSO) today compensates for the northward flowing Norwegian and Irminger branches of the North Atlantic Current that drive the Nordic heat pump. During the Last Glacial Maximum (LGM), ice sheets constricted the Denmark Strait aperture in addition to ice eustatic/isostatic effects which reduced its depth (today ~630 m) by ~130 m. These factors, combined with a reduced north-south density gradient of the water-masses, are expected to have restricted or even reversed the LGM DSO intensity. To better constrain these boundary conditions, we present a first reconstruction of the glacial DSO, using four new and four published epibenthic and planktic stable-isotope records from sites to the north and south of the Denmark Strait. The spatial and temporal distribution of epibenthic delta18O and delta13C maxima reveals a north-south density gradient at intermediate water depths from sigma0 ~28.7 to 28.4/28.1 and suggests that dense and highly ventilated water was convected in the Nordic Seas during the LGM. However, extremely high epibenthic delta13C values on top of the Mid-Atlantic Ridge document a further convection cell of Glacial North Atlantic Intermediate Water to the south of Iceland, which, however, was marked by much lower density (sigma0 ~28.1). The north-south gradient of water density possibly implied that the glacial DSO was directed to the south like today and fed Glacial North Atlantic Deep Water that has underthrusted the Glacial North Atlantic Intermediate Water in the Irminger Basin. Dataset Denmark Strait Greenland Greenland Sea Iceland Nordic Seas north atlantic current North Atlantic Deep Water North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Greenland Irminger Basin ENVELOPE(-36.000,-36.000,61.000,61.000) Mid-Atlantic Ridge ENVELOPE(-39.067500,-25.426500,67.930900,61.526000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
ARK-XVIII/1 Giant box corer GIK23519-4 GIK23519-5 GKG Gravity corer (Kiel type) Greenland Sea Iceland Sea Impact of Gateways on Ocean Circulation Climate and Evolution OceanGateways Ocean Gateways Oceanpassagen PC Piston corer Polarstern POS210/2 Poseidon PS62 PS62/003-2 PS62/004-3 PS62/015-3 SL |
spellingShingle |
ARK-XVIII/1 Giant box corer GIK23519-4 GIK23519-5 GKG Gravity corer (Kiel type) Greenland Sea Iceland Sea Impact of Gateways on Ocean Circulation Climate and Evolution OceanGateways Ocean Gateways Oceanpassagen PC Piston corer Polarstern POS210/2 Poseidon PS62 PS62/003-2 PS62/004-3 PS62/015-3 SL Millo, Christian Sarnthein, Michael Voelker, Antje H L Erlenkeuser, Helmut Stable carbon and oxygen isotope ratios of foraminifera from Holocene sediments of the North Atlantic |
topic_facet |
ARK-XVIII/1 Giant box corer GIK23519-4 GIK23519-5 GKG Gravity corer (Kiel type) Greenland Sea Iceland Sea Impact of Gateways on Ocean Circulation Climate and Evolution OceanGateways Ocean Gateways Oceanpassagen PC Piston corer Polarstern POS210/2 Poseidon PS62 PS62/003-2 PS62/004-3 PS62/015-3 SL |
description |
The Denmark Strait Overflow (DSO) today compensates for the northward flowing Norwegian and Irminger branches of the North Atlantic Current that drive the Nordic heat pump. During the Last Glacial Maximum (LGM), ice sheets constricted the Denmark Strait aperture in addition to ice eustatic/isostatic effects which reduced its depth (today ~630 m) by ~130 m. These factors, combined with a reduced north-south density gradient of the water-masses, are expected to have restricted or even reversed the LGM DSO intensity. To better constrain these boundary conditions, we present a first reconstruction of the glacial DSO, using four new and four published epibenthic and planktic stable-isotope records from sites to the north and south of the Denmark Strait. The spatial and temporal distribution of epibenthic delta18O and delta13C maxima reveals a north-south density gradient at intermediate water depths from sigma0 ~28.7 to 28.4/28.1 and suggests that dense and highly ventilated water was convected in the Nordic Seas during the LGM. However, extremely high epibenthic delta13C values on top of the Mid-Atlantic Ridge document a further convection cell of Glacial North Atlantic Intermediate Water to the south of Iceland, which, however, was marked by much lower density (sigma0 ~28.1). The north-south gradient of water density possibly implied that the glacial DSO was directed to the south like today and fed Glacial North Atlantic Deep Water that has underthrusted the Glacial North Atlantic Intermediate Water in the Irminger Basin. |
format |
Dataset |
author |
Millo, Christian Sarnthein, Michael Voelker, Antje H L Erlenkeuser, Helmut |
author_facet |
Millo, Christian Sarnthein, Michael Voelker, Antje H L Erlenkeuser, Helmut |
author_sort |
Millo, Christian |
title |
Stable carbon and oxygen isotope ratios of foraminifera from Holocene sediments of the North Atlantic |
title_short |
Stable carbon and oxygen isotope ratios of foraminifera from Holocene sediments of the North Atlantic |
title_full |
Stable carbon and oxygen isotope ratios of foraminifera from Holocene sediments of the North Atlantic |
title_fullStr |
Stable carbon and oxygen isotope ratios of foraminifera from Holocene sediments of the North Atlantic |
title_full_unstemmed |
Stable carbon and oxygen isotope ratios of foraminifera from Holocene sediments of the North Atlantic |
title_sort |
stable carbon and oxygen isotope ratios of foraminifera from holocene sediments of the north atlantic |
publisher |
PANGAEA |
publishDate |
2006 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.727694 https://doi.org/10.1594/PANGAEA.727694 |
op_coverage |
MEDIAN LATITUDE: 64.150747 * MEDIAN LONGITUDE: -32.362020 * SOUTH-BOUND LATITUDE: 61.526000 * WEST-BOUND LONGITUDE: -39.067500 * NORTH-BOUND LATITUDE: 67.930900 * EAST-BOUND LONGITUDE: -25.426500 * DATE/TIME START: 1995-08-18T00:00:00 * DATE/TIME END: 2002-07-06T00:44:00 |
long_lat |
ENVELOPE(-36.000,-36.000,61.000,61.000) ENVELOPE(-39.067500,-25.426500,67.930900,61.526000) |
geographic |
Greenland Irminger Basin Mid-Atlantic Ridge |
geographic_facet |
Greenland Irminger Basin Mid-Atlantic Ridge |
genre |
Denmark Strait Greenland Greenland Sea Iceland Nordic Seas north atlantic current North Atlantic Deep Water North Atlantic |
genre_facet |
Denmark Strait Greenland Greenland Sea Iceland Nordic Seas north atlantic current North Atlantic Deep Water North Atlantic |
op_source |
Supplement to: Millo, Christian; Sarnthein, Michael; Voelker, Antje H L; Erlenkeuser, Helmut (2006): Variability of the Denmark Strait Overflow during the Last Glacial Maximum. Boreas, 35(1), 50-60, https://doi.org/10.1111/j.1502-3885.2006.tb01112.x |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.727694 https://doi.org/10.1594/PANGAEA.727694 |
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.727694 https://doi.org/10.1111/j.1502-3885.2006.tb01112.x |
_version_ |
1766396625907875840 |