Quaternary paleoceanography of the Arctic Ocean : A study of sediment stratigraphy and physical properties
A Quaternary perspective on the paleoceanographic evolution of the central Arctic Ocean has been obtained in this PhD thesis by studying sediment cores from all of the Arctic’s major submarine ridges and plateaus. The included cores were mainly recovered during the Healy-Oden Trans-Arctic expedition...
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Institutionen för geologi och geokemi
2009
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ftstockholmuniv:oai:DiVA.org:su-30895 2023-05-15T13:20:25+02:00 Quaternary paleoceanography of the Arctic Ocean : A study of sediment stratigraphy and physical properties Sellén, Emma 2009 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-30895 eng eng Institutionen för geologi och geokemi Stockholm : Department of Geology and Geochemistry, Stockholm University Meddelanden från Stockholms universitets institution för geologi och geokemi, 1101-1599 337 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-30895 urn:isbn:978-91-7155-968-5 info:eu-repo/semantics/openAccess Arctic Ocean sedimentology Quaternary stratigraphy physical properties Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Geology Geologi Doctoral thesis, comprehensive summary info:eu-repo/semantics/doctoralThesis text 2009 ftstockholmuniv 2023-02-23T21:42:51Z A Quaternary perspective on the paleoceanographic evolution of the central Arctic Ocean has been obtained in this PhD thesis by studying sediment cores from all of the Arctic’s major submarine ridges and plateaus. The included cores were mainly recovered during the Healy-Oden Trans-Arctic expedition in 2005 and the Lomonosov Ridge off Greenland expedition in 2007. One of the main thesis objectives is to establish whether different sediment depositional regimes prevailed in different parts of the central Arctic Ocean during the Quaternary and, if so, establish general sedimentation rates for these regimes. This was approached by dating key cores using the decay of the cosmogenic isotopes 10Be and 14C, and through stratigraphic core-to-core correlation using sediment physical properties. However, the Arctic Ocean sea ice complicated the use of 10Be for dating because a solid sea ice cover prevents the 10Be isotopes from reaching the seafloor, resulting in too old ages. Dating using 14C is also complicated due to uncertain marine reservoir age corrections in the central Arctic Ocean. The core-to-core correlations show five areas with different depositional regimes; the northern Mendeleev Ridge and Alpha Ridge, southern Mendeleev Ridge, Morris Jesup Rise, Lomonosov Ridge and Yermak Plateau, listed in the order of increasing sedimentation rates from ~0.5cm/ka to ~4.8 cm/ka. A detailed study of the relationship between sediment bulk density and grain sizes suggests a strong link between variations in clay abundance and bulk density. Grain size analysis of a Lomonosov Ridge core show that fine silt and clay dominates the interglacials, possibly due to increased suspension freezing of these size fractions into sea ice and/or nepheloid transport. Sediments younger than the marine isotope stage (MIS) 7 generally contain more coarse silt, attributed to a regime shift during the Quaternary with increased iceberg transport into the central Arctic Ocean from MIS 6 and onwards. At the time of the doctoral defense, the ... Doctoral or Postdoctoral Thesis alpha ridge Arctic Arctic Ocean Greenland Iceberg* Lomonosov Ridge Sea ice Yermak plateau Stockholm University: Publications (DiVA) Alpha Ridge ENVELOPE(-120.000,-120.000,85.500,85.500) Arctic Arctic Ocean Greenland Morris Jesup Rise ENVELOPE(-20.000,-20.000,83.750,83.750) Yermak Plateau ENVELOPE(5.000,5.000,81.250,81.250) |
institution |
Open Polar |
collection |
Stockholm University: Publications (DiVA) |
op_collection_id |
ftstockholmuniv |
language |
English |
topic |
Arctic Ocean sedimentology Quaternary stratigraphy physical properties Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Geology Geologi |
spellingShingle |
Arctic Ocean sedimentology Quaternary stratigraphy physical properties Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Geology Geologi Sellén, Emma Quaternary paleoceanography of the Arctic Ocean : A study of sediment stratigraphy and physical properties |
topic_facet |
Arctic Ocean sedimentology Quaternary stratigraphy physical properties Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Geology Geologi |
description |
A Quaternary perspective on the paleoceanographic evolution of the central Arctic Ocean has been obtained in this PhD thesis by studying sediment cores from all of the Arctic’s major submarine ridges and plateaus. The included cores were mainly recovered during the Healy-Oden Trans-Arctic expedition in 2005 and the Lomonosov Ridge off Greenland expedition in 2007. One of the main thesis objectives is to establish whether different sediment depositional regimes prevailed in different parts of the central Arctic Ocean during the Quaternary and, if so, establish general sedimentation rates for these regimes. This was approached by dating key cores using the decay of the cosmogenic isotopes 10Be and 14C, and through stratigraphic core-to-core correlation using sediment physical properties. However, the Arctic Ocean sea ice complicated the use of 10Be for dating because a solid sea ice cover prevents the 10Be isotopes from reaching the seafloor, resulting in too old ages. Dating using 14C is also complicated due to uncertain marine reservoir age corrections in the central Arctic Ocean. The core-to-core correlations show five areas with different depositional regimes; the northern Mendeleev Ridge and Alpha Ridge, southern Mendeleev Ridge, Morris Jesup Rise, Lomonosov Ridge and Yermak Plateau, listed in the order of increasing sedimentation rates from ~0.5cm/ka to ~4.8 cm/ka. A detailed study of the relationship between sediment bulk density and grain sizes suggests a strong link between variations in clay abundance and bulk density. Grain size analysis of a Lomonosov Ridge core show that fine silt and clay dominates the interglacials, possibly due to increased suspension freezing of these size fractions into sea ice and/or nepheloid transport. Sediments younger than the marine isotope stage (MIS) 7 generally contain more coarse silt, attributed to a regime shift during the Quaternary with increased iceberg transport into the central Arctic Ocean from MIS 6 and onwards. At the time of the doctoral defense, the ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Sellén, Emma |
author_facet |
Sellén, Emma |
author_sort |
Sellén, Emma |
title |
Quaternary paleoceanography of the Arctic Ocean : A study of sediment stratigraphy and physical properties |
title_short |
Quaternary paleoceanography of the Arctic Ocean : A study of sediment stratigraphy and physical properties |
title_full |
Quaternary paleoceanography of the Arctic Ocean : A study of sediment stratigraphy and physical properties |
title_fullStr |
Quaternary paleoceanography of the Arctic Ocean : A study of sediment stratigraphy and physical properties |
title_full_unstemmed |
Quaternary paleoceanography of the Arctic Ocean : A study of sediment stratigraphy and physical properties |
title_sort |
quaternary paleoceanography of the arctic ocean : a study of sediment stratigraphy and physical properties |
publisher |
Institutionen för geologi och geokemi |
publishDate |
2009 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-30895 |
long_lat |
ENVELOPE(-120.000,-120.000,85.500,85.500) ENVELOPE(-20.000,-20.000,83.750,83.750) ENVELOPE(5.000,5.000,81.250,81.250) |
geographic |
Alpha Ridge Arctic Arctic Ocean Greenland Morris Jesup Rise Yermak Plateau |
geographic_facet |
Alpha Ridge Arctic Arctic Ocean Greenland Morris Jesup Rise Yermak Plateau |
genre |
alpha ridge Arctic Arctic Ocean Greenland Iceberg* Lomonosov Ridge Sea ice Yermak plateau |
genre_facet |
alpha ridge Arctic Arctic Ocean Greenland Iceberg* Lomonosov Ridge Sea ice Yermak plateau |
op_relation |
Meddelanden från Stockholms universitets institution för geologi och geokemi, 1101-1599 337 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-30895 urn:isbn:978-91-7155-968-5 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766353278272012288 |