A 16,000-yr-long sedimentary sequence from Lakes Peters and Schrader (Neruokpuk Lakes), northeastern Brooks Range, Alaska
Abstract Sediments that accumulate in high-latitude lakes serve as valuable environmental archives of changing conditions in a region currently undergoing rapid change. A previously unexplored sedimentary sequence reaching back 16,000 years from Lakes Peters and Schrader (Neruokpuk Lakes) in the nor...
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crcambridgeupr:10.1017/qua.2019.43 2024-03-03T08:42:10+00:00 A 16,000-yr-long sedimentary sequence from Lakes Peters and Schrader (Neruokpuk Lakes), northeastern Brooks Range, Alaska Benson, Christopher W. Kaufman, Darrell S. McKay, Nicholas P. Schiefer, Erik Fortin, David 2019 http://dx.doi.org/10.1017/qua.2019.43 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589419000437 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 92, issue 3, page 609-625 ISSN 0033-5894 1096-0287 General Earth and Planetary Sciences Earth-Surface Processes Arts and Humanities (miscellaneous) journal-article 2019 crcambridgeupr https://doi.org/10.1017/qua.2019.43 2024-02-08T08:43:06Z Abstract Sediments that accumulate in high-latitude lakes serve as valuable environmental archives of changing conditions in a region currently undergoing rapid change. A previously unexplored sedimentary sequence reaching back 16,000 years from Lakes Peters and Schrader (Neruokpuk Lakes) in the northeastern Brooks Range (69°N), Alaska, shows distinct changes in accumulation rates and biophysical properties including bulk density (BD), organic matter (OM) content, and grain-size distribution at five widely distributed core sites. The oldest sediments contain little OM and accumulated rapidly as glaciers retreated around 15 ka. OM peaked between 12 and 10 ka along with Northern Hemisphere summer insolation. BD increased and OM decreased until around 5 ka, possibly reflecting a decrease in river-transported terrestrial OM. From 5–2 ka, OM consistently increased, suggesting a rise in river discharge, or a rise in summer temperatures, which led to higher productivity, or both. After 2 ka, sediments increased in BD and decreased in OM, suggesting glacier growth. Evidence for glacier expansion late during the Little Ice Age is weak, but increased sedimentation rates may reflect glacier retreat during the last century. This study provides a framework for future paleoenvironmental research of a rare archive in a relatively pristine Arctic setting. Article in Journal/Newspaper Arctic Brooks Range glacier glaciers Alaska Cambridge University Press Arctic Quaternary Research 92 3 609 625 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
General Earth and Planetary Sciences Earth-Surface Processes Arts and Humanities (miscellaneous) |
spellingShingle |
General Earth and Planetary Sciences Earth-Surface Processes Arts and Humanities (miscellaneous) Benson, Christopher W. Kaufman, Darrell S. McKay, Nicholas P. Schiefer, Erik Fortin, David A 16,000-yr-long sedimentary sequence from Lakes Peters and Schrader (Neruokpuk Lakes), northeastern Brooks Range, Alaska |
topic_facet |
General Earth and Planetary Sciences Earth-Surface Processes Arts and Humanities (miscellaneous) |
description |
Abstract Sediments that accumulate in high-latitude lakes serve as valuable environmental archives of changing conditions in a region currently undergoing rapid change. A previously unexplored sedimentary sequence reaching back 16,000 years from Lakes Peters and Schrader (Neruokpuk Lakes) in the northeastern Brooks Range (69°N), Alaska, shows distinct changes in accumulation rates and biophysical properties including bulk density (BD), organic matter (OM) content, and grain-size distribution at five widely distributed core sites. The oldest sediments contain little OM and accumulated rapidly as glaciers retreated around 15 ka. OM peaked between 12 and 10 ka along with Northern Hemisphere summer insolation. BD increased and OM decreased until around 5 ka, possibly reflecting a decrease in river-transported terrestrial OM. From 5–2 ka, OM consistently increased, suggesting a rise in river discharge, or a rise in summer temperatures, which led to higher productivity, or both. After 2 ka, sediments increased in BD and decreased in OM, suggesting glacier growth. Evidence for glacier expansion late during the Little Ice Age is weak, but increased sedimentation rates may reflect glacier retreat during the last century. This study provides a framework for future paleoenvironmental research of a rare archive in a relatively pristine Arctic setting. |
format |
Article in Journal/Newspaper |
author |
Benson, Christopher W. Kaufman, Darrell S. McKay, Nicholas P. Schiefer, Erik Fortin, David |
author_facet |
Benson, Christopher W. Kaufman, Darrell S. McKay, Nicholas P. Schiefer, Erik Fortin, David |
author_sort |
Benson, Christopher W. |
title |
A 16,000-yr-long sedimentary sequence from Lakes Peters and Schrader (Neruokpuk Lakes), northeastern Brooks Range, Alaska |
title_short |
A 16,000-yr-long sedimentary sequence from Lakes Peters and Schrader (Neruokpuk Lakes), northeastern Brooks Range, Alaska |
title_full |
A 16,000-yr-long sedimentary sequence from Lakes Peters and Schrader (Neruokpuk Lakes), northeastern Brooks Range, Alaska |
title_fullStr |
A 16,000-yr-long sedimentary sequence from Lakes Peters and Schrader (Neruokpuk Lakes), northeastern Brooks Range, Alaska |
title_full_unstemmed |
A 16,000-yr-long sedimentary sequence from Lakes Peters and Schrader (Neruokpuk Lakes), northeastern Brooks Range, Alaska |
title_sort |
16,000-yr-long sedimentary sequence from lakes peters and schrader (neruokpuk lakes), northeastern brooks range, alaska |
publisher |
Cambridge University Press (CUP) |
publishDate |
2019 |
url |
http://dx.doi.org/10.1017/qua.2019.43 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589419000437 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Brooks Range glacier glaciers Alaska |
genre_facet |
Arctic Brooks Range glacier glaciers Alaska |
op_source |
Quaternary Research volume 92, issue 3, page 609-625 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/qua.2019.43 |
container_title |
Quaternary Research |
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92 |
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3 |
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609 |
op_container_end_page |
625 |
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1792497639716028416 |