Spatial and Temporal Offsets Between Proxy Records in a Sediment Drift
Chronologies for Late Quaternary marine sediment records are usually based on radiocarbon ages of planktonic foraminifera. Signals carried by other sedimentary components measured in parallel can provide complementary paleoclimate information. A key premise is that microfossils and other indicators...
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American Association for the Advancement of Science (AAAS)
2002
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Online Access: | http://dx.doi.org/10.1126/science.1075287 https://www.science.org/doi/pdf/10.1126/science.1075287 |
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craaas:10.1126/science.1075287 2024-06-23T07:56:15+00:00 Spatial and Temporal Offsets Between Proxy Records in a Sediment Drift Ohkouchi, Nao Eglinton, Timothy I. Keigwin, Lloyd D. Hayes, John M. 2002 http://dx.doi.org/10.1126/science.1075287 https://www.science.org/doi/pdf/10.1126/science.1075287 en eng American Association for the Advancement of Science (AAAS) Science volume 298, issue 5596, page 1224-1227 ISSN 0036-8075 1095-9203 journal-article 2002 craaas https://doi.org/10.1126/science.1075287 2024-06-13T04:01:13Z Chronologies for Late Quaternary marine sediment records are usually based on radiocarbon ages of planktonic foraminifera. Signals carried by other sedimentary components measured in parallel can provide complementary paleoclimate information. A key premise is that microfossils and other indicators within a given sediment horizon are of equal age. We show here that haptophyte-derived alkenones isolated from Bermuda Rise drift sediments are up to 7000 years older than coexisting planktonic foraminifera. This temporal offset, which is apparently due to lateral transport of alkenones on fine-grained particles from the Nova Scotian margin, markedly influences molecular estimates of sea surface temperatures. More broadly, the observation raises questions about both the temporal and the geographic fidelity of paleoenvironmental records encoded by readily transported components of sediments. Article in Journal/Newspaper Planktonic foraminifera AAAS Resource Center (American Association for the Advancement of Science) Science 298 5596 1224 1227 |
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AAAS Resource Center (American Association for the Advancement of Science) |
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English |
description |
Chronologies for Late Quaternary marine sediment records are usually based on radiocarbon ages of planktonic foraminifera. Signals carried by other sedimentary components measured in parallel can provide complementary paleoclimate information. A key premise is that microfossils and other indicators within a given sediment horizon are of equal age. We show here that haptophyte-derived alkenones isolated from Bermuda Rise drift sediments are up to 7000 years older than coexisting planktonic foraminifera. This temporal offset, which is apparently due to lateral transport of alkenones on fine-grained particles from the Nova Scotian margin, markedly influences molecular estimates of sea surface temperatures. More broadly, the observation raises questions about both the temporal and the geographic fidelity of paleoenvironmental records encoded by readily transported components of sediments. |
format |
Article in Journal/Newspaper |
author |
Ohkouchi, Nao Eglinton, Timothy I. Keigwin, Lloyd D. Hayes, John M. |
spellingShingle |
Ohkouchi, Nao Eglinton, Timothy I. Keigwin, Lloyd D. Hayes, John M. Spatial and Temporal Offsets Between Proxy Records in a Sediment Drift |
author_facet |
Ohkouchi, Nao Eglinton, Timothy I. Keigwin, Lloyd D. Hayes, John M. |
author_sort |
Ohkouchi, Nao |
title |
Spatial and Temporal Offsets Between Proxy Records in a Sediment Drift |
title_short |
Spatial and Temporal Offsets Between Proxy Records in a Sediment Drift |
title_full |
Spatial and Temporal Offsets Between Proxy Records in a Sediment Drift |
title_fullStr |
Spatial and Temporal Offsets Between Proxy Records in a Sediment Drift |
title_full_unstemmed |
Spatial and Temporal Offsets Between Proxy Records in a Sediment Drift |
title_sort |
spatial and temporal offsets between proxy records in a sediment drift |
publisher |
American Association for the Advancement of Science (AAAS) |
publishDate |
2002 |
url |
http://dx.doi.org/10.1126/science.1075287 https://www.science.org/doi/pdf/10.1126/science.1075287 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Science volume 298, issue 5596, page 1224-1227 ISSN 0036-8075 1095-9203 |
op_doi |
https://doi.org/10.1126/science.1075287 |
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Science |
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298 |
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5596 |
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1224 |
op_container_end_page |
1227 |
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1802649221464064000 |