A 40,000-yr record of environmental change from Burial Lake in Northwest Alaska
Burial Lake in northwest Alaska records changes in water level and regional vegetation since ?39,000 cal yr BP based on terrestrial macrofossil AMS radiocarbon dates. A sedimentary unconformity is dated between 34,800 and 23,200 cal yr BP. During all or some of this period there was a hiatus in depo...
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ftsouthampton:oai:eprints.soton.ac.uk:158377 2023-07-30T04:07:20+02:00 A 40,000-yr record of environmental change from Burial Lake in Northwest Alaska Abbott, Mark B. Edwards, Mary E. Finney, Bruce P. 2010 text https://eprints.soton.ac.uk/158377/ https://eprints.soton.ac.uk/158377/1/burial_post_proof.pdf en eng https://eprints.soton.ac.uk/158377/1/burial_post_proof.pdf Abbott, Mark B., Edwards, Mary E. and Finney, Bruce P. (2010) A 40,000-yr record of environmental change from Burial Lake in Northwest Alaska. Quaternary Research. (doi:10.1016/j.yqres.2010.03.007 <http://dx.doi.org/10.1016/j.yqres.2010.03.007>). Article PeerReviewed 2010 ftsouthampton https://doi.org/10.1016/j.yqres.2010.03.007 2023-07-09T21:17:35Z Burial Lake in northwest Alaska records changes in water level and regional vegetation since ?39,000 cal yr BP based on terrestrial macrofossil AMS radiocarbon dates. A sedimentary unconformity is dated between 34,800 and 23,200 cal yr BP. During all or some of this period there was a hiatus in deposition indicating a major drop in lake level and deflation of lacustrine sediments. MIS 3 vegetation was herb-shrub tundra; more xeric graminoid-herb tundra developed after 23,200 cal yr BP. The tundra gradually became more mesic after 17,000 cal yr BP. Expansions of Salix then Betula, at 15,000 and 14,000 cal yr BP, respectively, are coincident with a major rise in lake level marked by increasing fine-grained sediment and higher organic matter content. Several sites in the region display disrupted sedimentation and probable hiatuses during the last glacial maximum (LGM); together regional data indicate an arid interval prior to and during the LGM and continued low moisture levels until ?15,000 cal yr BP. AMS 14C dates from Burial Lake are approximately synchronous with AMS 14C dates reported for the Betula expansion at nearby sites and sites across northern Alaska, but 1000–2000 yr younger than bulk-sediment dates. Article in Journal/Newspaper Tundra Alaska University of Southampton: e-Prints Soton Quaternary Research 74 1 156 165 |
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Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
Burial Lake in northwest Alaska records changes in water level and regional vegetation since ?39,000 cal yr BP based on terrestrial macrofossil AMS radiocarbon dates. A sedimentary unconformity is dated between 34,800 and 23,200 cal yr BP. During all or some of this period there was a hiatus in deposition indicating a major drop in lake level and deflation of lacustrine sediments. MIS 3 vegetation was herb-shrub tundra; more xeric graminoid-herb tundra developed after 23,200 cal yr BP. The tundra gradually became more mesic after 17,000 cal yr BP. Expansions of Salix then Betula, at 15,000 and 14,000 cal yr BP, respectively, are coincident with a major rise in lake level marked by increasing fine-grained sediment and higher organic matter content. Several sites in the region display disrupted sedimentation and probable hiatuses during the last glacial maximum (LGM); together regional data indicate an arid interval prior to and during the LGM and continued low moisture levels until ?15,000 cal yr BP. AMS 14C dates from Burial Lake are approximately synchronous with AMS 14C dates reported for the Betula expansion at nearby sites and sites across northern Alaska, but 1000–2000 yr younger than bulk-sediment dates. |
format |
Article in Journal/Newspaper |
author |
Abbott, Mark B. Edwards, Mary E. Finney, Bruce P. |
spellingShingle |
Abbott, Mark B. Edwards, Mary E. Finney, Bruce P. A 40,000-yr record of environmental change from Burial Lake in Northwest Alaska |
author_facet |
Abbott, Mark B. Edwards, Mary E. Finney, Bruce P. |
author_sort |
Abbott, Mark B. |
title |
A 40,000-yr record of environmental change from Burial Lake in Northwest Alaska |
title_short |
A 40,000-yr record of environmental change from Burial Lake in Northwest Alaska |
title_full |
A 40,000-yr record of environmental change from Burial Lake in Northwest Alaska |
title_fullStr |
A 40,000-yr record of environmental change from Burial Lake in Northwest Alaska |
title_full_unstemmed |
A 40,000-yr record of environmental change from Burial Lake in Northwest Alaska |
title_sort |
40,000-yr record of environmental change from burial lake in northwest alaska |
publishDate |
2010 |
url |
https://eprints.soton.ac.uk/158377/ https://eprints.soton.ac.uk/158377/1/burial_post_proof.pdf |
genre |
Tundra Alaska |
genre_facet |
Tundra Alaska |
op_relation |
https://eprints.soton.ac.uk/158377/1/burial_post_proof.pdf Abbott, Mark B., Edwards, Mary E. and Finney, Bruce P. (2010) A 40,000-yr record of environmental change from Burial Lake in Northwest Alaska. Quaternary Research. (doi:10.1016/j.yqres.2010.03.007 <http://dx.doi.org/10.1016/j.yqres.2010.03.007>). |
op_doi |
https://doi.org/10.1016/j.yqres.2010.03.007 |
container_title |
Quaternary Research |
container_volume |
74 |
container_issue |
1 |
container_start_page |
156 |
op_container_end_page |
165 |
_version_ |
1772820580232331264 |