Dating late Quaternary planktonic foraminifer Neogloboquadrina pachyderma from the Arctic Ocean using amino acid racemization
Dating late Quaternary planktonic foraminifer Neogloboquadrina pachyderma from the Arctic Ocean using amino acid racemization
The long-term rate of racemization for amino acids preserved in planktonic foraminifera was determined by using independently dated sediment cores from the Arctic Ocean. The racemization rates for aspartic acid (Asp) and glutamic acid (Glu) in the common taxon, Neogloboquadrina pachyderma, were calibrated for the last 150 ka using 14C ages and the emerging Quaternary chronostratigraphy of Arctic Ocean sediments. An analysis of errors indicates realistic age uncertainties of about ±12% for Asp and ±17% for Glu. Fifty individual tests are sufficient to analyze multiple subsamples, identify outliers, and derive robust sample mean values. The new age equation can be applied to verify and refine age models for sediment cores elsewhere in the Arctic Ocean, a critical region for understanding the dynamics of global climate change.
amino acid racemization, quaternary geochronology, arctic ocean, planktonic foraminifera
Kaufman, Darrell S.
3b636f4b-85a3-4327-8e92-5da206565ac6
Polyak, Leonid
d98748c7-21e7-4850-9ce4-d6cacdb7ba50
Adler, Ruth
9907e1d4-40d0-4c89-bc93-61ae24a82418
Channell, James E.T.
55b6c1cc-76e7-4ca5-8186-d9111b9b5158
Xuan, Chuang
3f3cad12-b17b-46ae-957a-b362def5b837
September 2008
Kaufman, Darrell S.
3b636f4b-85a3-4327-8e92-5da206565ac6
Polyak, Leonid
d98748c7-21e7-4850-9ce4-d6cacdb7ba50
Adler, Ruth
9907e1d4-40d0-4c89-bc93-61ae24a82418
Channell, James E.T.
55b6c1cc-76e7-4ca5-8186-d9111b9b5158
Xuan, Chuang
3f3cad12-b17b-46ae-957a-b362def5b837
Kaufman, Darrell S., Polyak, Leonid, Adler, Ruth, Channell, James E.T. and Xuan, Chuang
(2008)
Dating late Quaternary planktonic foraminifer Neogloboquadrina pachyderma from the Arctic Ocean using amino acid racemization.
Paleoceanography, 23 (3).
(doi:10.1029/2008PA001618).
Abstract
The long-term rate of racemization for amino acids preserved in planktonic foraminifera was determined by using independently dated sediment cores from the Arctic Ocean. The racemization rates for aspartic acid (Asp) and glutamic acid (Glu) in the common taxon, Neogloboquadrina pachyderma, were calibrated for the last 150 ka using 14C ages and the emerging Quaternary chronostratigraphy of Arctic Ocean sediments. An analysis of errors indicates realistic age uncertainties of about ±12% for Asp and ±17% for Glu. Fifty individual tests are sufficient to analyze multiple subsamples, identify outliers, and derive robust sample mean values. The new age equation can be applied to verify and refine age models for sediment cores elsewhere in the Arctic Ocean, a critical region for understanding the dynamics of global climate change.
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e-pub ahead of print date: 30 September 2008
Published date: September 2008
Keywords:
amino acid racemization, quaternary geochronology, arctic ocean, planktonic foraminifera
Organisations:
Ocean and Earth Science
Identifiers
Local EPrints ID: 351207
URI: http://eprints.soton.ac.uk/id/eprint/351207
ISSN: 0883-8305
PURE UUID: b5030014-6cb0-4ae3-96bc-f2e1be5f243c
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Date deposited: 16 Apr 2013 11:27
Last modified: 15 Mar 2024 03:48
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Contributors
Author:
Darrell S. Kaufman
Author:
Leonid Polyak
Author:
Ruth Adler
Author:
James E.T. Channell
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