Tephrochronology of the North Atlantic during the Last Glacial period – a paleoclimate synchronization tool
During present time, the global climate is changing at a rapid pace. To understand the future consequences of these changes, studies of past abrupt climate change are essential. A natural analogue to the current climate change is re-occurring abrupt warming episodes first witnessed in Greenland duri...
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ftunivbergen:oai:bora.uib.no:11250/2736466 2023-05-15T16:28:32+02:00 Tephrochronology of the North Atlantic during the Last Glacial period – a paleoclimate synchronization tool Rutledal, Sunniva orcid:0000-0002-6151-0229 2021-03-11T14:27:02.492Z application/pdf https://hdl.handle.net/11250/2736466 eng eng The University of Bergen Paper I: Rutledal, S., Berben, S. M. P., Dokken, T. M., van der Bilt, W. G. M., Cederstrøm, J. M. and Jansen, E. 2020: Tephra horizons identified in the western North Atlantic and Nordic Seas during the Last Glacial Period: Extending the marine tephra framework. Quaternary Science Reviews, 240, 106247. The article is available at: https://hdl.handle.net/11250/2736462 Paper II: Rutledal, S., Simon, M. H., Haflidason, H., Berben, S. M. P. and Dokken, T. M. Sustained Atlantic inflow into the Nordic Seas at the onset of the LGM revealed by near-surface marine reservoir ages. Not available in BORA. Paper III: Rutledal, S., Haflidason, H., Berben, S. M. P., Griem, L., and Jansen, E. 2020: A continuous tephrostratigraphic record from the Labrador Sea spanning the last 65 ka. Journal of Quaternary Science, 35, 7, 855-868. The article is available at: https://hdl.handle.net/11250/2736465 container/51/6c/2d/b3/516c2db3-d131-4bf5-825b-2cb2019c67d6 urn:isbn:9788230864012 urn:isbn:9788230859209 https://hdl.handle.net/11250/2736466 In copyright http://rightsstatements.org/page/InC/1.0/ Copyright the Author. All rights reserved Doctoral thesis 2021 ftunivbergen 2023-03-14T17:40:30Z During present time, the global climate is changing at a rapid pace. To understand the future consequences of these changes, studies of past abrupt climate change are essential. A natural analogue to the current climate change is re-occurring abrupt warming episodes first witnessed in Greenland during the Last Glacial period. These events, referred to as Dansgaard-Oeschger (DO) events manifested as rapid warming on decadal timescales of up to 15°C in Greenland air temperature, followed by a gradual decline to colder temperatures. Understanding of the forcing mechanisms behind these events is currently limited by chronological uncertainties and the inability to accurately synchronize disparate climate records. However, the application of tephrochronology has the potential for testing hypotheses regarding the synchroneity of past climate change events. This by utilizing the near to simultaneous deposition of geochemically distinct tephra material in different climate archives over large geographical distances. That potential is demonstrated in this thesis, by the documentation of previously known and unknown tephra horizons in the North Atlantic Ocean. Findings presented in this thesis extend the established North Atlantic marine tephra framework by the identification of the well-known Faroe Marine Ash Zone (FMAZ) II-1 and North Atlantic Ash Zone (NAAZ) II (II-RHY-1) tephra horizons in the Irminger and Labrador Seas. A significant discovery, opening for a wider marine- marine cross-correlation of paleoproxy records. Furthermore, this thesis demonstrates the previously unknown tephrochronological potential of the Labrador Sea region by the publication of the first continuous tephrostratigraphic record from this area. Here, five isochronous tephra layers sourced from the Bárdarbunga-Veidivötn and Grímsvötn volcanic systems have the potential to serve as important chronological tie- points, if identified elsewhere in future studies. Collectively, these two studies (Paper 1 and 3), document that regions outside the ... Doctoral or Postdoctoral Thesis Greenland Labrador Sea North Atlantic University of Bergen: Bergen Open Research Archive (BORA-UiB) Greenland |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
During present time, the global climate is changing at a rapid pace. To understand the future consequences of these changes, studies of past abrupt climate change are essential. A natural analogue to the current climate change is re-occurring abrupt warming episodes first witnessed in Greenland during the Last Glacial period. These events, referred to as Dansgaard-Oeschger (DO) events manifested as rapid warming on decadal timescales of up to 15°C in Greenland air temperature, followed by a gradual decline to colder temperatures. Understanding of the forcing mechanisms behind these events is currently limited by chronological uncertainties and the inability to accurately synchronize disparate climate records. However, the application of tephrochronology has the potential for testing hypotheses regarding the synchroneity of past climate change events. This by utilizing the near to simultaneous deposition of geochemically distinct tephra material in different climate archives over large geographical distances. That potential is demonstrated in this thesis, by the documentation of previously known and unknown tephra horizons in the North Atlantic Ocean. Findings presented in this thesis extend the established North Atlantic marine tephra framework by the identification of the well-known Faroe Marine Ash Zone (FMAZ) II-1 and North Atlantic Ash Zone (NAAZ) II (II-RHY-1) tephra horizons in the Irminger and Labrador Seas. A significant discovery, opening for a wider marine- marine cross-correlation of paleoproxy records. Furthermore, this thesis demonstrates the previously unknown tephrochronological potential of the Labrador Sea region by the publication of the first continuous tephrostratigraphic record from this area. Here, five isochronous tephra layers sourced from the Bárdarbunga-Veidivötn and Grímsvötn volcanic systems have the potential to serve as important chronological tie- points, if identified elsewhere in future studies. Collectively, these two studies (Paper 1 and 3), document that regions outside the ... |
author2 |
orcid:0000-0002-6151-0229 |
format |
Doctoral or Postdoctoral Thesis |
author |
Rutledal, Sunniva |
spellingShingle |
Rutledal, Sunniva Tephrochronology of the North Atlantic during the Last Glacial period – a paleoclimate synchronization tool |
author_facet |
Rutledal, Sunniva |
author_sort |
Rutledal, Sunniva |
title |
Tephrochronology of the North Atlantic during the Last Glacial period – a paleoclimate synchronization tool |
title_short |
Tephrochronology of the North Atlantic during the Last Glacial period – a paleoclimate synchronization tool |
title_full |
Tephrochronology of the North Atlantic during the Last Glacial period – a paleoclimate synchronization tool |
title_fullStr |
Tephrochronology of the North Atlantic during the Last Glacial period – a paleoclimate synchronization tool |
title_full_unstemmed |
Tephrochronology of the North Atlantic during the Last Glacial period – a paleoclimate synchronization tool |
title_sort |
tephrochronology of the north atlantic during the last glacial period – a paleoclimate synchronization tool |
publisher |
The University of Bergen |
publishDate |
2021 |
url |
https://hdl.handle.net/11250/2736466 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Labrador Sea North Atlantic |
genre_facet |
Greenland Labrador Sea North Atlantic |
op_relation |
Paper I: Rutledal, S., Berben, S. M. P., Dokken, T. M., van der Bilt, W. G. M., Cederstrøm, J. M. and Jansen, E. 2020: Tephra horizons identified in the western North Atlantic and Nordic Seas during the Last Glacial Period: Extending the marine tephra framework. Quaternary Science Reviews, 240, 106247. The article is available at: https://hdl.handle.net/11250/2736462 Paper II: Rutledal, S., Simon, M. H., Haflidason, H., Berben, S. M. P. and Dokken, T. M. Sustained Atlantic inflow into the Nordic Seas at the onset of the LGM revealed by near-surface marine reservoir ages. Not available in BORA. Paper III: Rutledal, S., Haflidason, H., Berben, S. M. P., Griem, L., and Jansen, E. 2020: A continuous tephrostratigraphic record from the Labrador Sea spanning the last 65 ka. Journal of Quaternary Science, 35, 7, 855-868. The article is available at: https://hdl.handle.net/11250/2736465 container/51/6c/2d/b3/516c2db3-d131-4bf5-825b-2cb2019c67d6 urn:isbn:9788230864012 urn:isbn:9788230859209 https://hdl.handle.net/11250/2736466 |
op_rights |
In copyright http://rightsstatements.org/page/InC/1.0/ Copyright the Author. All rights reserved |
_version_ |
1766018183333937152 |