Age determination and stable isotope record of foraminifera of sediment core SO82_5-2
Surface and deepwater paleoclimate records in Irminger Sea core SO82-5 (59°N, 31°W) and Icelandic Sea core PS2644 (68°N, 22°W) exhibit large fluctuations in thermohaline circulation (THC) from 60 to 18 calendar kyr B.P., with a dominant periodicity of 1460 years from 46 to 22 calendar kyr B.P., matc...
Main Authors: | , , , , , , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2000
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.735017 https://doi.org/10.1594/PANGAEA.735017 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.735017 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
GEOMAR GIK/IfG GLAMAP Global Environmental Change: The Northern North Atlantic Helmholtz Centre for Ocean Research Kiel Institute for Geosciences Christian Albrechts University Kiel KAL Kasten corer REYKJANES-RÜCKEN SFB313 SO82 SO82_5-2 Sonne |
spellingShingle |
GEOMAR GIK/IfG GLAMAP Global Environmental Change: The Northern North Atlantic Helmholtz Centre for Ocean Research Kiel Institute for Geosciences Christian Albrechts University Kiel KAL Kasten corer REYKJANES-RÜCKEN SFB313 SO82 SO82_5-2 Sonne van Kreveld, Shirley A Sarnthein, Michael Erlenkeuser, Helmut Grootes, Pieter Meiert Jung, Simon J A Pflaumann, Uwe Voelker, Antje H L Age determination and stable isotope record of foraminifera of sediment core SO82_5-2 |
topic_facet |
GEOMAR GIK/IfG GLAMAP Global Environmental Change: The Northern North Atlantic Helmholtz Centre for Ocean Research Kiel Institute for Geosciences Christian Albrechts University Kiel KAL Kasten corer REYKJANES-RÜCKEN SFB313 SO82 SO82_5-2 Sonne |
description |
Surface and deepwater paleoclimate records in Irminger Sea core SO82-5 (59°N, 31°W) and Icelandic Sea core PS2644 (68°N, 22°W) exhibit large fluctuations in thermohaline circulation (THC) from 60 to 18 calendar kyr B.P., with a dominant periodicity of 1460 years from 46 to 22 calendar kyr B.P., matching the Dansgaard-Oeschger (D-O) cycles in the Greenland Ice Sheet Project 2 (GISP2) temperature record [Grootes and Stuiver, 1997, doi:10.1029/97JC00880]. During interstadials, summer sea surface temperatures (SSTsu) in the Irminger Sea averaged to 8°C, and sea surface salinities (SSS) averaged to ~36.5, recording a strong Irminger Current and Atlantic THC. During stadials, SSTsu dropped to 2°-4°C, in phase with SSS drops by ~1-2. They reveal major meltwater injections along with the East Greenland Current, which turned off the North Atlantic deepwater convection and hence the heat advection to the north, in harmony with various ocean circulation and ice models. On the basis of the IRD composition, icebergs came from Iceland, east Greenland, and perhaps Svalbard and other northern ice sheets. However, the southward drifting icebergs were initially jammed in the Denmark Strait, reaching the Irminger Sea only with a lag of 155-195 years. We also conclude that the abrupt stadial terminations, the D-O warming events, were tied to iceberg melt via abundant seasonal sea ice and brine water formation in the meltwater-covered northwestern North Atlantic. In the 1/1460-year frequency band, benthic ?18O brine water spikes led the temperature maxima above Greenland and in the Irminger Sea by as little as 95 years. Thus abundant brine formation, which was induced by seasonal freezing of large parts of the northwestern Atlantic, may have finally entrained a current of warm surface water from the subtropics and thereby triggered the sudden reactivation of the THC. In summary, the internal dynamics of the east Greenland ice sheet may have formed the ultimate pacemaker of D-O cycles. |
format |
Dataset |
author |
van Kreveld, Shirley A Sarnthein, Michael Erlenkeuser, Helmut Grootes, Pieter Meiert Jung, Simon J A Pflaumann, Uwe Voelker, Antje H L |
author_facet |
van Kreveld, Shirley A Sarnthein, Michael Erlenkeuser, Helmut Grootes, Pieter Meiert Jung, Simon J A Pflaumann, Uwe Voelker, Antje H L |
author_sort |
van Kreveld, Shirley A |
title |
Age determination and stable isotope record of foraminifera of sediment core SO82_5-2 |
title_short |
Age determination and stable isotope record of foraminifera of sediment core SO82_5-2 |
title_full |
Age determination and stable isotope record of foraminifera of sediment core SO82_5-2 |
title_fullStr |
Age determination and stable isotope record of foraminifera of sediment core SO82_5-2 |
title_full_unstemmed |
Age determination and stable isotope record of foraminifera of sediment core SO82_5-2 |
title_sort |
age determination and stable isotope record of foraminifera of sediment core so82_5-2 |
publisher |
PANGAEA |
publishDate |
2000 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.735017 https://doi.org/10.1594/PANGAEA.735017 |
op_coverage |
LATITUDE: 59.186167 * LONGITUDE: -30.904833 * DATE/TIME START: 1992-10-21T00:00:00 * DATE/TIME END: 1992-10-21T00:00:00 |
long_lat |
ENVELOPE(-22.250,-22.250,65.467,65.467) ENVELOPE(-34.041,-34.041,63.054,63.054) ENVELOPE(-30.904833,-30.904833,59.186167,59.186167) |
geographic |
Svalbard Greenland Reykjanes Irminger Sea |
geographic_facet |
Svalbard Greenland Reykjanes Irminger Sea |
genre |
Denmark Strait East Greenland east greenland current Greenland Greenland Ice Sheet Project Ice Sheet Iceland North Atlantic Sea ice Svalbard |
genre_facet |
Denmark Strait East Greenland east greenland current Greenland Greenland Ice Sheet Project Ice Sheet Iceland North Atlantic Sea ice Svalbard |
op_source |
Supplement to: van Kreveld, Shirley A; Sarnthein, Michael; Erlenkeuser, Helmut; Grootes, Pieter Meiert; Jung, Simon J A; Pflaumann, Uwe; Voelker, Antje H L (2000): Potential links between surging ice sheets, circulation changes, and the Dansgaard-Oeschger cycles in the Irminger Sea, 60-18 kyr. Paleoceanography, 15(4), 425-442, https://doi.org/10.1029/1999PA000464 |
op_relation |
Sarnthein, Michael; Stattegger, Karl; Dreger, Derek; Erlenkeuser, Helmut; Grootes, Pieter Meiert; Haupt, Bernd Joachim; Jung, Simon J A; Kiefer, Thorsten; Kuhnt, Wolfgang; Pflaumann, Uwe; Schäfer-Neth, Christian; Schulz, Hartmut; Schulz, Michael; Seidov, Dan; Simstich, Johannes; van Kreveld, Shirley A; Vogelsang, Elke; Voelker, Antje H L; Weinelt, Mara (2001): Fundamental modes and abrupt changes in North Atlantic circulation and climate over the last 60 ky - concepts, reconstruction and numerical modeling. In: Schäfer, W; Ritzrau, M; Schlüter & J. Thiede (eds.) The Northern North Atlantic: A Changing Environment, Springer Verlag, Berlin, 500 pp, 365-410, https://doi.org/10.1007/978-3-642-56876-3_21 https://doi.pangaea.de/10.1594/PANGAEA.735017 https://doi.org/10.1594/PANGAEA.735017 |
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.735017 https://doi.org/10.1029/1999PA000464 |
_version_ |
1766396710436732928 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.735017 2023-05-15T16:00:42+02:00 Age determination and stable isotope record of foraminifera of sediment core SO82_5-2 van Kreveld, Shirley A Sarnthein, Michael Erlenkeuser, Helmut Grootes, Pieter Meiert Jung, Simon J A Pflaumann, Uwe Voelker, Antje H L LATITUDE: 59.186167 * LONGITUDE: -30.904833 * DATE/TIME START: 1992-10-21T00:00:00 * DATE/TIME END: 1992-10-21T00:00:00 2000-03-12 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.735017 https://doi.org/10.1594/PANGAEA.735017 en eng PANGAEA Sarnthein, Michael; Stattegger, Karl; Dreger, Derek; Erlenkeuser, Helmut; Grootes, Pieter Meiert; Haupt, Bernd Joachim; Jung, Simon J A; Kiefer, Thorsten; Kuhnt, Wolfgang; Pflaumann, Uwe; Schäfer-Neth, Christian; Schulz, Hartmut; Schulz, Michael; Seidov, Dan; Simstich, Johannes; van Kreveld, Shirley A; Vogelsang, Elke; Voelker, Antje H L; Weinelt, Mara (2001): Fundamental modes and abrupt changes in North Atlantic circulation and climate over the last 60 ky - concepts, reconstruction and numerical modeling. In: Schäfer, W; Ritzrau, M; Schlüter & J. Thiede (eds.) The Northern North Atlantic: A Changing Environment, Springer Verlag, Berlin, 500 pp, 365-410, https://doi.org/10.1007/978-3-642-56876-3_21 https://doi.pangaea.de/10.1594/PANGAEA.735017 https://doi.org/10.1594/PANGAEA.735017 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: van Kreveld, Shirley A; Sarnthein, Michael; Erlenkeuser, Helmut; Grootes, Pieter Meiert; Jung, Simon J A; Pflaumann, Uwe; Voelker, Antje H L (2000): Potential links between surging ice sheets, circulation changes, and the Dansgaard-Oeschger cycles in the Irminger Sea, 60-18 kyr. Paleoceanography, 15(4), 425-442, https://doi.org/10.1029/1999PA000464 GEOMAR GIK/IfG GLAMAP Global Environmental Change: The Northern North Atlantic Helmholtz Centre for Ocean Research Kiel Institute for Geosciences Christian Albrechts University Kiel KAL Kasten corer REYKJANES-RÜCKEN SFB313 SO82 SO82_5-2 Sonne Dataset 2000 ftpangaea https://doi.org/10.1594/PANGAEA.735017 https://doi.org/10.1029/1999PA000464 2023-01-20T07:31:41Z Surface and deepwater paleoclimate records in Irminger Sea core SO82-5 (59°N, 31°W) and Icelandic Sea core PS2644 (68°N, 22°W) exhibit large fluctuations in thermohaline circulation (THC) from 60 to 18 calendar kyr B.P., with a dominant periodicity of 1460 years from 46 to 22 calendar kyr B.P., matching the Dansgaard-Oeschger (D-O) cycles in the Greenland Ice Sheet Project 2 (GISP2) temperature record [Grootes and Stuiver, 1997, doi:10.1029/97JC00880]. During interstadials, summer sea surface temperatures (SSTsu) in the Irminger Sea averaged to 8°C, and sea surface salinities (SSS) averaged to ~36.5, recording a strong Irminger Current and Atlantic THC. During stadials, SSTsu dropped to 2°-4°C, in phase with SSS drops by ~1-2. They reveal major meltwater injections along with the East Greenland Current, which turned off the North Atlantic deepwater convection and hence the heat advection to the north, in harmony with various ocean circulation and ice models. On the basis of the IRD composition, icebergs came from Iceland, east Greenland, and perhaps Svalbard and other northern ice sheets. However, the southward drifting icebergs were initially jammed in the Denmark Strait, reaching the Irminger Sea only with a lag of 155-195 years. We also conclude that the abrupt stadial terminations, the D-O warming events, were tied to iceberg melt via abundant seasonal sea ice and brine water formation in the meltwater-covered northwestern North Atlantic. In the 1/1460-year frequency band, benthic ?18O brine water spikes led the temperature maxima above Greenland and in the Irminger Sea by as little as 95 years. Thus abundant brine formation, which was induced by seasonal freezing of large parts of the northwestern Atlantic, may have finally entrained a current of warm surface water from the subtropics and thereby triggered the sudden reactivation of the THC. In summary, the internal dynamics of the east Greenland ice sheet may have formed the ultimate pacemaker of D-O cycles. Dataset Denmark Strait East Greenland east greenland current Greenland Greenland Ice Sheet Project Ice Sheet Iceland North Atlantic Sea ice Svalbard PANGAEA - Data Publisher for Earth & Environmental Science Svalbard Greenland Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) ENVELOPE(-30.904833,-30.904833,59.186167,59.186167) |