Reconstructing Pliocene climatic, oceanic and tectonic interactions in the North East Atlantic, Nordic Seas and onshore Iceland by geochemical fingerprinting of marine and terrestrial sediments
During the Pliocene (5.33−2.58 Ma), the NE Atlantic and Nordic Seas witnessed a transition from enhanced warming, whereby surface temperatures were up to 8°C warmer than present, to cooling associated with the intensification of the Northern Hemisphere Glaciation. Currently, there are few reliable m...
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ftunibirmitheses:oai:etheses.bham.ac.uk:11460 2023-05-15T16:48:10+02:00 Reconstructing Pliocene climatic, oceanic and tectonic interactions in the North East Atlantic, Nordic Seas and onshore Iceland by geochemical fingerprinting of marine and terrestrial sediments Hall, Jonathan Richard Jones, Stephen Dunkley Jones, Tom Bendle, James nerc 2021-07-21 text http://etheses.bham.ac.uk//id/eprint/11460/7.hassmallThumbnailVersion/Hall2021PhD.pdf http://etheses.bham.ac.uk//id/eprint/11460/ http://etheses.bham.ac.uk//id/eprint/11460/7/Hall2021PhD.pdf English eng http://etheses.bham.ac.uk//id/eprint/11460/7/Hall2021PhD.pdf Hall, Jonathan Richard orcid:0000-0002-3707-6709 (2021). Reconstructing Pliocene climatic, oceanic and tectonic interactions in the North East Atlantic, Nordic Seas and onshore Iceland by geochemical fingerprinting of marine and terrestrial sediments. University of Birmingham. Ph.D. QE Geology Thesis NonPeerReviewed 2021 ftunibirmitheses 2022-09-08T23:04:12Z During the Pliocene (5.33−2.58 Ma), the NE Atlantic and Nordic Seas witnessed a transition from enhanced warming, whereby surface temperatures were up to 8°C warmer than present, to cooling associated with the intensification of the Northern Hemisphere Glaciation. Currently, there are few reliable multiproxy datasets to document this change, and a notable mismatch between data- and model-based temperature reconstructions. This thesis develops a new palaeoclimatic, palaeoceanographic and palaeogeographic understanding of this region during the Pliocene by geochemical fingerprinting of marine and terrestrial sediments. First, new benthic foraminifera δ\(^{13}\)C and authigenic εNd records are used to assess tectonic and climatic controls on deep-water connectivity between the NE Atlantic and Norwegian basins. Secondly, new alkenone and TEX86 records are used to evaluate the magnitude of warming, and to unravel whether data/model discrepancies are attributable to proxy biases. Thirdly, brown coals from the Pliocene Tjörnes Beds in northern Iceland are investigated to establish whether they preserve branched GDGTs capable of reconstructing terrestrial temperatures. Together, these results suggest climatic events are at least as important as tectonic events in driving regional oceanic circulation at this time, and reveal data/model discrepancies are influenced by warming biases, associated with the analysis of low concentration alkenones. Thesis Iceland Nordic Seas North East Atlantic University of Birmingham: eTheses Repository Tjörnes ENVELOPE(-17.087,-17.087,66.152,66.152) |
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Open Polar |
collection |
University of Birmingham: eTheses Repository |
op_collection_id |
ftunibirmitheses |
language |
English |
topic |
QE Geology |
spellingShingle |
QE Geology Hall, Jonathan Richard Reconstructing Pliocene climatic, oceanic and tectonic interactions in the North East Atlantic, Nordic Seas and onshore Iceland by geochemical fingerprinting of marine and terrestrial sediments |
topic_facet |
QE Geology |
description |
During the Pliocene (5.33−2.58 Ma), the NE Atlantic and Nordic Seas witnessed a transition from enhanced warming, whereby surface temperatures were up to 8°C warmer than present, to cooling associated with the intensification of the Northern Hemisphere Glaciation. Currently, there are few reliable multiproxy datasets to document this change, and a notable mismatch between data- and model-based temperature reconstructions. This thesis develops a new palaeoclimatic, palaeoceanographic and palaeogeographic understanding of this region during the Pliocene by geochemical fingerprinting of marine and terrestrial sediments. First, new benthic foraminifera δ\(^{13}\)C and authigenic εNd records are used to assess tectonic and climatic controls on deep-water connectivity between the NE Atlantic and Norwegian basins. Secondly, new alkenone and TEX86 records are used to evaluate the magnitude of warming, and to unravel whether data/model discrepancies are attributable to proxy biases. Thirdly, brown coals from the Pliocene Tjörnes Beds in northern Iceland are investigated to establish whether they preserve branched GDGTs capable of reconstructing terrestrial temperatures. Together, these results suggest climatic events are at least as important as tectonic events in driving regional oceanic circulation at this time, and reveal data/model discrepancies are influenced by warming biases, associated with the analysis of low concentration alkenones. |
author2 |
Jones, Stephen Dunkley Jones, Tom Bendle, James nerc |
format |
Thesis |
author |
Hall, Jonathan Richard |
author_facet |
Hall, Jonathan Richard |
author_sort |
Hall, Jonathan Richard |
title |
Reconstructing Pliocene climatic, oceanic and tectonic interactions in the North East Atlantic, Nordic Seas and onshore Iceland by geochemical fingerprinting of marine and terrestrial sediments |
title_short |
Reconstructing Pliocene climatic, oceanic and tectonic interactions in the North East Atlantic, Nordic Seas and onshore Iceland by geochemical fingerprinting of marine and terrestrial sediments |
title_full |
Reconstructing Pliocene climatic, oceanic and tectonic interactions in the North East Atlantic, Nordic Seas and onshore Iceland by geochemical fingerprinting of marine and terrestrial sediments |
title_fullStr |
Reconstructing Pliocene climatic, oceanic and tectonic interactions in the North East Atlantic, Nordic Seas and onshore Iceland by geochemical fingerprinting of marine and terrestrial sediments |
title_full_unstemmed |
Reconstructing Pliocene climatic, oceanic and tectonic interactions in the North East Atlantic, Nordic Seas and onshore Iceland by geochemical fingerprinting of marine and terrestrial sediments |
title_sort |
reconstructing pliocene climatic, oceanic and tectonic interactions in the north east atlantic, nordic seas and onshore iceland by geochemical fingerprinting of marine and terrestrial sediments |
publishDate |
2021 |
url |
http://etheses.bham.ac.uk//id/eprint/11460/7.hassmallThumbnailVersion/Hall2021PhD.pdf http://etheses.bham.ac.uk//id/eprint/11460/ http://etheses.bham.ac.uk//id/eprint/11460/7/Hall2021PhD.pdf |
long_lat |
ENVELOPE(-17.087,-17.087,66.152,66.152) |
geographic |
Tjörnes |
geographic_facet |
Tjörnes |
genre |
Iceland Nordic Seas North East Atlantic |
genre_facet |
Iceland Nordic Seas North East Atlantic |
op_relation |
http://etheses.bham.ac.uk//id/eprint/11460/7/Hall2021PhD.pdf Hall, Jonathan Richard orcid:0000-0002-3707-6709 (2021). Reconstructing Pliocene climatic, oceanic and tectonic interactions in the North East Atlantic, Nordic Seas and onshore Iceland by geochemical fingerprinting of marine and terrestrial sediments. University of Birmingham. Ph.D. |
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1766038279656833024 |