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Sediment record from the western Arctic Ocean with an improved Late Quaternary age resolution: HOTRAX core HLY0503-8JPC, Mendeleev Ridge

Sediment record from the western Arctic Ocean with an improved Late Quaternary age resolution: HOTRAX core HLY0503-8JPC, Mendeleev Ridge
Sediment record from the western Arctic Ocean with an improved Late Quaternary age resolution: HOTRAX core HLY0503-8JPC, Mendeleev Ridge
Sediment core HLY0503-8JPC raised by the HOTRAX'05 expedition from the Mendeleev Ridge was analyzed for multiple lithological, paleontological, and stable-isotopic proxies to reconstruct paleoceanographic conditions in the western Arctic Ocean during the Late Quaternary. The core, extensively sampled in the upper 5 m, reveals pronounced changes in sedimentary environments during the ca. 250 kyr interval encompassing Marine Isotopic Stages (MIS) 1 to 7. An estimated average resolution of 500 yr/sample, at least for the last glacial cycle including the last interglacial, provides more detail than seen in other sedimentary records from the western Arctic Ocean. The age control is provided by 14C and amino acid racemization measurements on planktonic foraminifers and correlations with the stratigraphy developed for the central Lomonosov Ridge and with glacial events at the Eurasian Arctic margin. Cyclic variations in lithology combined with foraminiferal abundance and stable-isotopic composition indicate profound changes in hydrographic and depositional environments between interglacial-type and glacial-type periods apparently reflecting a combination of 100-kyr and precessional time scales. This periodicity is complicated by abrupt iceberg- and/or meltwater-discharge events with variable (Laurentide vs. Eurasian) provenance. The proxy record from the interval identified as the last interglacial (MIS 5e), which may aid in understanding the future state of the Arctic Ocean, indicates low ice conditions and possibly enhanced stratification of the water column.
arctic ocean, mendeleev ridge, sediment stratigraphy, late quaternary, glaciations, last interglacial
0921-8181
18-29
Adler, Ruth E.
fbe774bb-1577-4d0d-9c3f-5712beca37fd
Polyak, Leonid
d98748c7-21e7-4850-9ce4-d6cacdb7ba50
Ortiz, Joseph D.
804f8306-251e-4212-95bb-03ed00197741
Kaufman, Darrell S.
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Channell, James E.T.
55b6c1cc-76e7-4ca5-8186-d9111b9b5158
Xuan, Chuang
3f3cad12-b17b-46ae-957a-b362def5b837
Grottoli, Andréa G.
5560b86b-5288-425d-ac58-843b22514acc
Sellén, Emma
e94f1d87-2732-413b-aa93-9d2cfee8aafb
Crawford, Kevin A.
dbefd30b-fa52-4ca5-807a-9c26c365c3a8
Adler, Ruth E.
fbe774bb-1577-4d0d-9c3f-5712beca37fd
Polyak, Leonid
d98748c7-21e7-4850-9ce4-d6cacdb7ba50
Ortiz, Joseph D.
804f8306-251e-4212-95bb-03ed00197741
Kaufman, Darrell S.
3b636f4b-85a3-4327-8e92-5da206565ac6
Channell, James E.T.
55b6c1cc-76e7-4ca5-8186-d9111b9b5158
Xuan, Chuang
3f3cad12-b17b-46ae-957a-b362def5b837
Grottoli, Andréa G.
5560b86b-5288-425d-ac58-843b22514acc
Sellén, Emma
e94f1d87-2732-413b-aa93-9d2cfee8aafb
Crawford, Kevin A.
dbefd30b-fa52-4ca5-807a-9c26c365c3a8

Adler, Ruth E., Polyak, Leonid, Ortiz, Joseph D., Kaufman, Darrell S., Channell, James E.T., Xuan, Chuang, Grottoli, Andréa G., Sellén, Emma and Crawford, Kevin A. (2009) Sediment record from the western Arctic Ocean with an improved Late Quaternary age resolution: HOTRAX core HLY0503-8JPC, Mendeleev Ridge [in special issue: The 2005 HOTRAX Expedition to the Arctic Ocean] Global and Planetary Change, 68, (1-2), pp. 18-29.

Record type: Article

Abstract

Sediment core HLY0503-8JPC raised by the HOTRAX'05 expedition from the Mendeleev Ridge was analyzed for multiple lithological, paleontological, and stable-isotopic proxies to reconstruct paleoceanographic conditions in the western Arctic Ocean during the Late Quaternary. The core, extensively sampled in the upper 5 m, reveals pronounced changes in sedimentary environments during the ca. 250 kyr interval encompassing Marine Isotopic Stages (MIS) 1 to 7. An estimated average resolution of 500 yr/sample, at least for the last glacial cycle including the last interglacial, provides more detail than seen in other sedimentary records from the western Arctic Ocean. The age control is provided by 14C and amino acid racemization measurements on planktonic foraminifers and correlations with the stratigraphy developed for the central Lomonosov Ridge and with glacial events at the Eurasian Arctic margin. Cyclic variations in lithology combined with foraminiferal abundance and stable-isotopic composition indicate profound changes in hydrographic and depositional environments between interglacial-type and glacial-type periods apparently reflecting a combination of 100-kyr and precessional time scales. This periodicity is complicated by abrupt iceberg- and/or meltwater-discharge events with variable (Laurentide vs. Eurasian) provenance. The proxy record from the interval identified as the last interglacial (MIS 5e), which may aid in understanding the future state of the Arctic Ocean, indicates low ice conditions and possibly enhanced stratification of the water column.

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More information

Published date: July 2009
Keywords: arctic ocean, mendeleev ridge, sediment stratigraphy, late quaternary, glaciations, last interglacial
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 351202
URI: http://eprints.soton.ac.uk/id/eprint/351202
ISSN: 0921-8181
PURE UUID: a96837ff-e8de-4c19-bc79-9f9a55f8efeb
ORCID for Chuang Xuan: ORCID iD orcid.org/0000-0003-4043-3073

Catalogue record

Date deposited: 16 Apr 2013 10:56
Last modified: 05 Nov 2017 00:29

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Contributors

Author: Ruth E. Adler
Author: Leonid Polyak
Author: Joseph D. Ortiz
Author: Darrell S. Kaufman
Author: James E.T. Channell
Author: Chuang Xuan ORCID iD
Author: Andréa G. Grottoli
Author: Emma Sellén
Author: Kevin A. Crawford

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