Amino acid racemization of Neogloboquadrina pachyderma from the Arctic Ocean

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 cali...

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Bibliographic Details
Main Authors: Kaufman, Darrell S, Polyak, Leonid, Adler, Ruth E, Channell, James E T, Xuan, Chuang
Format: Dataset
Language:English
Published: PANGAEA 2008
Subjects:
Arctic
Arctic Ocean
Climate change
Foraminifera*
Neogloboquadrina pachyderma
Planktonic foraminifera
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.832121
https://doi.org/10.1594/PANGAEA.832121
Description
Summary: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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