From early Miocene to present: Reconstruction of the deep Thermohaline Circulation at the Eirik Drift
The Thermohaline Circulation (THC) distributes heat and freshwater around the global oceans, interacts with the atmosphere, and therefore is closely connected to the global climate. The deep branch of the North Atlantic THC mainly consists of deep-water formed by atmospheric cooling in the Nordic Se...
Main Author: | |
---|---|
Other Authors: | , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
Published: |
Universität Bremen
2014
|
Subjects: | |
Online Access: | https://media.suub.uni-bremen.de/handle/elib/635 https://nbn-resolving.org/urn:nbn:de:gbv:46-00103689-14 |
id |
ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/635 |
---|---|
record_format |
openpolar |
spelling |
ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/635 2023-05-15T16:00:42+02:00 From early Miocene to present: Reconstruction of the deep Thermohaline Circulation at the Eirik Drift Rekonstruktion der tiefen Thermohalinen Zirkulation an der Eirik Drift seit dem frühen Miozän Müller-Michaelis, Antje Stein, Rüdiger Uenzelmann-Neben, Gabriele Huhn, Katrin 2014-02-26 application/pdf https://media.suub.uni-bremen.de/handle/elib/635 https://nbn-resolving.org/urn:nbn:de:gbv:46-00103689-14 eng eng Universität Bremen FB5 Geowissenschaften https://media.suub.uni-bremen.de/handle/elib/635 urn:nbn:de:gbv:46-00103689-14 info:eu-repo/semantics/openAccess Alle Rechte vorbehalten Sediment Drift Labrador Sea North Atlantic Deep Water (NADW) Western Boundary Undercurrent (WBUC) North Atlantic Thermohaline Circulation North Atlantic climate 550 550 Earth sciences and geology ddc:550 Dissertation doctoralThesis 2014 ftsubbremen 2022-12-18T23:09:13Z The Thermohaline Circulation (THC) distributes heat and freshwater around the global oceans, interacts with the atmosphere, and therefore is closely connected to the global climate. The deep branch of the North Atlantic THC mainly consists of deep-water formed by atmospheric cooling in the Nordic Seas, which overflows the Greenland-Scotland Ridge into the North Atlantic. The Eirik Drift south of Greenland is located closely downstream of the North Atlantic deep-water formation region and has been shaped by the Western Boundary Undercurrent (WBUC), which constitutes the main part of the deep North Atlantic THC. The sedimentary record of the Eirik Drift documents changes of the WBUC activity, which can be related to climate changes. The analysis of the sedimentary structure in combination with geological information from scientific drilling leads to a revised seismostratigraphic concept at the Eirik Drift and reveals particularly that the Eirik Drift has been influenced by the WBUC already since the early Miocene (~19 Ma). A more detailed structural analysis of the depocenter locations and their redistribution results in a temporal reconstruction of the deep paleocirculation at the Eirik Drift. The observed changes of pathways and intensity of the WBUC at the Eirik Drift were linked to the development of the Greenland-Scotland Ridge and climate changes. The onset of drift building at the Eirk Drift followed the formation of the Faroe Conduit in early Miocene, which allowed northern sourced deep-water to overflow the eastern part of the Greenland-Scotland Ridge. A separation of the WBUC at the Eirik Drift into two branches occurred contemporaneously with the onset of deep-water overflow at the Denmark Strait, the western part of the Greenland-Scotland Ridge (~7 Ma). At the Eirik Drift, strong WBUC activity is inferred to occur during warm climates and at the beginning of cooling phases, while cooling phases with enhanced ice extent are characterized by weak WBUC activity. Based on a combination of these ... Doctoral or Postdoctoral Thesis Denmark Strait Greenland Greenland-Scotland Ridge Labrador Sea NADW Nordic Seas North Atlantic Deep Water North Atlantic North atlantic Thermohaline circulation Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) Greenland |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
English |
topic |
Sediment Drift Labrador Sea North Atlantic Deep Water (NADW) Western Boundary Undercurrent (WBUC) North Atlantic Thermohaline Circulation North Atlantic climate 550 550 Earth sciences and geology ddc:550 |
spellingShingle |
Sediment Drift Labrador Sea North Atlantic Deep Water (NADW) Western Boundary Undercurrent (WBUC) North Atlantic Thermohaline Circulation North Atlantic climate 550 550 Earth sciences and geology ddc:550 Müller-Michaelis, Antje From early Miocene to present: Reconstruction of the deep Thermohaline Circulation at the Eirik Drift |
topic_facet |
Sediment Drift Labrador Sea North Atlantic Deep Water (NADW) Western Boundary Undercurrent (WBUC) North Atlantic Thermohaline Circulation North Atlantic climate 550 550 Earth sciences and geology ddc:550 |
description |
The Thermohaline Circulation (THC) distributes heat and freshwater around the global oceans, interacts with the atmosphere, and therefore is closely connected to the global climate. The deep branch of the North Atlantic THC mainly consists of deep-water formed by atmospheric cooling in the Nordic Seas, which overflows the Greenland-Scotland Ridge into the North Atlantic. The Eirik Drift south of Greenland is located closely downstream of the North Atlantic deep-water formation region and has been shaped by the Western Boundary Undercurrent (WBUC), which constitutes the main part of the deep North Atlantic THC. The sedimentary record of the Eirik Drift documents changes of the WBUC activity, which can be related to climate changes. The analysis of the sedimentary structure in combination with geological information from scientific drilling leads to a revised seismostratigraphic concept at the Eirik Drift and reveals particularly that the Eirik Drift has been influenced by the WBUC already since the early Miocene (~19 Ma). A more detailed structural analysis of the depocenter locations and their redistribution results in a temporal reconstruction of the deep paleocirculation at the Eirik Drift. The observed changes of pathways and intensity of the WBUC at the Eirik Drift were linked to the development of the Greenland-Scotland Ridge and climate changes. The onset of drift building at the Eirk Drift followed the formation of the Faroe Conduit in early Miocene, which allowed northern sourced deep-water to overflow the eastern part of the Greenland-Scotland Ridge. A separation of the WBUC at the Eirik Drift into two branches occurred contemporaneously with the onset of deep-water overflow at the Denmark Strait, the western part of the Greenland-Scotland Ridge (~7 Ma). At the Eirik Drift, strong WBUC activity is inferred to occur during warm climates and at the beginning of cooling phases, while cooling phases with enhanced ice extent are characterized by weak WBUC activity. Based on a combination of these ... |
author2 |
Stein, Rüdiger Uenzelmann-Neben, Gabriele Huhn, Katrin |
format |
Doctoral or Postdoctoral Thesis |
author |
Müller-Michaelis, Antje |
author_facet |
Müller-Michaelis, Antje |
author_sort |
Müller-Michaelis, Antje |
title |
From early Miocene to present: Reconstruction of the deep Thermohaline Circulation at the Eirik Drift |
title_short |
From early Miocene to present: Reconstruction of the deep Thermohaline Circulation at the Eirik Drift |
title_full |
From early Miocene to present: Reconstruction of the deep Thermohaline Circulation at the Eirik Drift |
title_fullStr |
From early Miocene to present: Reconstruction of the deep Thermohaline Circulation at the Eirik Drift |
title_full_unstemmed |
From early Miocene to present: Reconstruction of the deep Thermohaline Circulation at the Eirik Drift |
title_sort |
from early miocene to present: reconstruction of the deep thermohaline circulation at the eirik drift |
publisher |
Universität Bremen |
publishDate |
2014 |
url |
https://media.suub.uni-bremen.de/handle/elib/635 https://nbn-resolving.org/urn:nbn:de:gbv:46-00103689-14 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Denmark Strait Greenland Greenland-Scotland Ridge Labrador Sea NADW Nordic Seas North Atlantic Deep Water North Atlantic North atlantic Thermohaline circulation |
genre_facet |
Denmark Strait Greenland Greenland-Scotland Ridge Labrador Sea NADW Nordic Seas North Atlantic Deep Water North Atlantic North atlantic Thermohaline circulation |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/635 urn:nbn:de:gbv:46-00103689-14 |
op_rights |
info:eu-repo/semantics/openAccess Alle Rechte vorbehalten |
_version_ |
1766396710617088000 |