Atlantic water inflow to Labrador Sea and its interaction with ice sheet dynamics during the Holocene
Highlights • First granulometric record of Holocene Atlantic water inflow into Labrador Sea. • Good temporal correlation with North Atlantic current speeds and AMOC. • Highest current speeds in the early Holocene, lowest during the Neoglaciation. • Distinction between Atlantic water inflow and influ...
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ftoceanrep:oai:oceanrep.geomar.de:51978 2024-02-11T10:02:17+01:00 Atlantic water inflow to Labrador Sea and its interaction with ice sheet dynamics during the Holocene Weiser, Jens Titschack, Jürgen Kienast, Markus McCave, Ian Nicholas Lochte, Annalena Antonia Saini, Jeetendra Stein, Rüdiger Hebbeln, Dierk 2021-03 text https://oceanrep.geomar.de/id/eprint/51978/ https://oceanrep.geomar.de/id/eprint/51978/1/1-s2.0-S0277379121000408-main.pdf https://oceanrep.geomar.de/id/eprint/51978/2/1-s2.0-S0277379121000408-mmc1.docx https://doi.org/10.1016/j.quascirev.2021.106833 en eng Elsvier https://oceanrep.geomar.de/id/eprint/51978/1/1-s2.0-S0277379121000408-main.pdf https://oceanrep.geomar.de/id/eprint/51978/2/1-s2.0-S0277379121000408-mmc1.docx Weiser, J., Titschack, J., Kienast, M., McCave, I. N., Lochte, A. A., Saini, J., Stein, R. and Hebbeln, D. (2021) Atlantic water inflow to Labrador Sea and its interaction with ice sheet dynamics during the Holocene. Open Access Quaternary Science Reviews, 256 . Art.Nr. 106833. DOI 10.1016/j.quascirev.2021.106833 <https://doi.org/10.1016/j.quascirev.2021.106833>. doi:10.1016/j.quascirev.2021.106833 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2021 ftoceanrep https://doi.org/10.1016/j.quascirev.2021.106833 2024-01-15T00:22:57Z Highlights • First granulometric record of Holocene Atlantic water inflow into Labrador Sea. • Good temporal correlation with North Atlantic current speeds and AMOC. • Highest current speeds in the early Holocene, lowest during the Neoglaciation. • Distinction between Atlantic water inflow and influence crucial for paleo-studies. • Local ice sheet advances in SW Greenland during “8.2”-event and Neoglaciation. Abstract The hydrodynamics of the Labrador Sea, controlled by the complex interplay of oceanographic, atmospheric and ice-sheet processes, play a crucial role for the Atlantic Meridional Overturning Circulation (AMOC). An improved understanding of the hydrodynamics and its forcing in the past could therefore hold a key to understanding its future behaviour. At present, there is a remarkable temporal mismatch, in that the largely microfossil-based reconstructions of Holocene Atlantic-water inflow/influence in the Labrador Sea and Baffin Bay appear to lag grain size-based current strength reconstructions from the adjacent North Atlantic by > 2ka. Here, we present the first current strength record from the West Greenland shelf off Nuuk to reconstruct Atlantic Water (AW)-inflow to the Labrador Sea via the West Greenland Current. Our data show that the Holocene AW-inflow into Labrador Sea is well aligned with the Holocene Speed Maximum documented in the North Atlantic (McCave and Andrews, 2019; Quat. Sci. Rev. 223), suggesting a close coupling with the AMOC. The observed lag between the microfossil-based records and the Holocene Speed Maximum can be explained when considering the presence of an extended meltwater lens that prevented the shoaling of the inflowing Atlantic waters. Once the meltwater discharge waned after the cessation of large-scale melting of the surrounding ice sheets, the AW could influence the surface waters, independently of the strength of its inflow. Only then was an effective ocean-atmosphere heat transfer enabled, triggering the comparably late onset of the regional Holocene Thermal ... Article in Journal/Newspaper Baffin Bay Baffin Bay Baffin Greenland Ice Sheet Labrador Sea north atlantic current North Atlantic Nuuk OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Baffin Bay Greenland Nuuk ENVELOPE(-52.150,-52.150,68.717,68.717) Quaternary Science Reviews 256 106833 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Highlights • First granulometric record of Holocene Atlantic water inflow into Labrador Sea. • Good temporal correlation with North Atlantic current speeds and AMOC. • Highest current speeds in the early Holocene, lowest during the Neoglaciation. • Distinction between Atlantic water inflow and influence crucial for paleo-studies. • Local ice sheet advances in SW Greenland during “8.2”-event and Neoglaciation. Abstract The hydrodynamics of the Labrador Sea, controlled by the complex interplay of oceanographic, atmospheric and ice-sheet processes, play a crucial role for the Atlantic Meridional Overturning Circulation (AMOC). An improved understanding of the hydrodynamics and its forcing in the past could therefore hold a key to understanding its future behaviour. At present, there is a remarkable temporal mismatch, in that the largely microfossil-based reconstructions of Holocene Atlantic-water inflow/influence in the Labrador Sea and Baffin Bay appear to lag grain size-based current strength reconstructions from the adjacent North Atlantic by > 2ka. Here, we present the first current strength record from the West Greenland shelf off Nuuk to reconstruct Atlantic Water (AW)-inflow to the Labrador Sea via the West Greenland Current. Our data show that the Holocene AW-inflow into Labrador Sea is well aligned with the Holocene Speed Maximum documented in the North Atlantic (McCave and Andrews, 2019; Quat. Sci. Rev. 223), suggesting a close coupling with the AMOC. The observed lag between the microfossil-based records and the Holocene Speed Maximum can be explained when considering the presence of an extended meltwater lens that prevented the shoaling of the inflowing Atlantic waters. Once the meltwater discharge waned after the cessation of large-scale melting of the surrounding ice sheets, the AW could influence the surface waters, independently of the strength of its inflow. Only then was an effective ocean-atmosphere heat transfer enabled, triggering the comparably late onset of the regional Holocene Thermal ... |
format |
Article in Journal/Newspaper |
author |
Weiser, Jens Titschack, Jürgen Kienast, Markus McCave, Ian Nicholas Lochte, Annalena Antonia Saini, Jeetendra Stein, Rüdiger Hebbeln, Dierk |
spellingShingle |
Weiser, Jens Titschack, Jürgen Kienast, Markus McCave, Ian Nicholas Lochte, Annalena Antonia Saini, Jeetendra Stein, Rüdiger Hebbeln, Dierk Atlantic water inflow to Labrador Sea and its interaction with ice sheet dynamics during the Holocene |
author_facet |
Weiser, Jens Titschack, Jürgen Kienast, Markus McCave, Ian Nicholas Lochte, Annalena Antonia Saini, Jeetendra Stein, Rüdiger Hebbeln, Dierk |
author_sort |
Weiser, Jens |
title |
Atlantic water inflow to Labrador Sea and its interaction with ice sheet dynamics during the Holocene |
title_short |
Atlantic water inflow to Labrador Sea and its interaction with ice sheet dynamics during the Holocene |
title_full |
Atlantic water inflow to Labrador Sea and its interaction with ice sheet dynamics during the Holocene |
title_fullStr |
Atlantic water inflow to Labrador Sea and its interaction with ice sheet dynamics during the Holocene |
title_full_unstemmed |
Atlantic water inflow to Labrador Sea and its interaction with ice sheet dynamics during the Holocene |
title_sort |
atlantic water inflow to labrador sea and its interaction with ice sheet dynamics during the holocene |
publisher |
Elsvier |
publishDate |
2021 |
url |
https://oceanrep.geomar.de/id/eprint/51978/ https://oceanrep.geomar.de/id/eprint/51978/1/1-s2.0-S0277379121000408-main.pdf https://oceanrep.geomar.de/id/eprint/51978/2/1-s2.0-S0277379121000408-mmc1.docx https://doi.org/10.1016/j.quascirev.2021.106833 |
long_lat |
ENVELOPE(-52.150,-52.150,68.717,68.717) |
geographic |
Baffin Bay Greenland Nuuk |
geographic_facet |
Baffin Bay Greenland Nuuk |
genre |
Baffin Bay Baffin Bay Baffin Greenland Ice Sheet Labrador Sea north atlantic current North Atlantic Nuuk |
genre_facet |
Baffin Bay Baffin Bay Baffin Greenland Ice Sheet Labrador Sea north atlantic current North Atlantic Nuuk |
op_relation |
https://oceanrep.geomar.de/id/eprint/51978/1/1-s2.0-S0277379121000408-main.pdf https://oceanrep.geomar.de/id/eprint/51978/2/1-s2.0-S0277379121000408-mmc1.docx Weiser, J., Titschack, J., Kienast, M., McCave, I. N., Lochte, A. A., Saini, J., Stein, R. and Hebbeln, D. (2021) Atlantic water inflow to Labrador Sea and its interaction with ice sheet dynamics during the Holocene. Open Access Quaternary Science Reviews, 256 . Art.Nr. 106833. DOI 10.1016/j.quascirev.2021.106833 <https://doi.org/10.1016/j.quascirev.2021.106833>. doi:10.1016/j.quascirev.2021.106833 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2021.106833 |
container_title |
Quaternary Science Reviews |
container_volume |
256 |
container_start_page |
106833 |
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1790598218489266176 |