Extreme decay of meteoric beryllium-10 as a proxy for persistent aridity
The modern Antarctic Dry Valleys are locked in a hyper-arid, polar climate that enables the East Antarctic Ice Sheet (EAIS) to remain stable, frozen to underlying bedrock. The duration of these dry, cold conditions is a critical prerequisite when modeling the long-term mass balance of the EAIS durin...
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ftpubmed:oai:pubmedcentral.nih.gov:4673429 2023-05-15T13:33:24+02:00 Extreme decay of meteoric beryllium-10 as a proxy for persistent aridity Valletta, Rachel D. Willenbring, Jane K. Lewis, Adam R. Ashworth, Allan C. Caffee, Marc 2015-12-09 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4673429/ http://www.ncbi.nlm.nih.gov/pubmed/26647733 https://doi.org/10.1038/srep17813 en eng Nature Publishing Group http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4673429/ http://www.ncbi.nlm.nih.gov/pubmed/26647733 http://dx.doi.org/10.1038/srep17813 Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ CC-BY Article Text 2015 ftpubmed https://doi.org/10.1038/srep17813 2015-12-20T01:17:52Z The modern Antarctic Dry Valleys are locked in a hyper-arid, polar climate that enables the East Antarctic Ice Sheet (EAIS) to remain stable, frozen to underlying bedrock. The duration of these dry, cold conditions is a critical prerequisite when modeling the long-term mass balance of the EAIS during past warm climates and is best examined using terrestrial paleoclimatic proxies. Unfortunately, deposits containing such proxies are extremely rare and often difficult to date. Here, we apply a unique dating approach to tundra deposits using concentrations of meteoric beryllium-10 (10Be) adhered to paleolake sediments from the Friis Hills, central Dry Valleys. We show that lake sediments were emplaced between 14–17.5 My and have remained untouched by meteoric waters since that time. Our results support the notion that the onset of Dry Valleys aridification occurred ~14 My, precluding the possibility of EAIS collapse during Pliocene warming events. Lake fossils indicate that >14 My ago the Dry Valleys hosted a moist tundra that flourished in elevated atmospheric CO2 (>400 ppm). Thus, Dry Valleys tundra deposits record regional climatic transitions that affect EAIS mass balance, and, in a global paleoclimatic context, these deposits demonstrate how warming induced by 400 ppm CO2 manifests at high latitudes. Text Antarc* Antarctic Ice Sheet Tundra PubMed Central (PMC) Antarctic East Antarctic Ice Sheet Friis Hills ENVELOPE(161.417,161.417,-77.750,-77.750) Scientific Reports 5 1 |
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Article Valletta, Rachel D. Willenbring, Jane K. Lewis, Adam R. Ashworth, Allan C. Caffee, Marc Extreme decay of meteoric beryllium-10 as a proxy for persistent aridity |
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Article |
description |
The modern Antarctic Dry Valleys are locked in a hyper-arid, polar climate that enables the East Antarctic Ice Sheet (EAIS) to remain stable, frozen to underlying bedrock. The duration of these dry, cold conditions is a critical prerequisite when modeling the long-term mass balance of the EAIS during past warm climates and is best examined using terrestrial paleoclimatic proxies. Unfortunately, deposits containing such proxies are extremely rare and often difficult to date. Here, we apply a unique dating approach to tundra deposits using concentrations of meteoric beryllium-10 (10Be) adhered to paleolake sediments from the Friis Hills, central Dry Valleys. We show that lake sediments were emplaced between 14–17.5 My and have remained untouched by meteoric waters since that time. Our results support the notion that the onset of Dry Valleys aridification occurred ~14 My, precluding the possibility of EAIS collapse during Pliocene warming events. Lake fossils indicate that >14 My ago the Dry Valleys hosted a moist tundra that flourished in elevated atmospheric CO2 (>400 ppm). Thus, Dry Valleys tundra deposits record regional climatic transitions that affect EAIS mass balance, and, in a global paleoclimatic context, these deposits demonstrate how warming induced by 400 ppm CO2 manifests at high latitudes. |
format |
Text |
author |
Valletta, Rachel D. Willenbring, Jane K. Lewis, Adam R. Ashworth, Allan C. Caffee, Marc |
author_facet |
Valletta, Rachel D. Willenbring, Jane K. Lewis, Adam R. Ashworth, Allan C. Caffee, Marc |
author_sort |
Valletta, Rachel D. |
title |
Extreme decay of meteoric beryllium-10 as a proxy for persistent aridity |
title_short |
Extreme decay of meteoric beryllium-10 as a proxy for persistent aridity |
title_full |
Extreme decay of meteoric beryllium-10 as a proxy for persistent aridity |
title_fullStr |
Extreme decay of meteoric beryllium-10 as a proxy for persistent aridity |
title_full_unstemmed |
Extreme decay of meteoric beryllium-10 as a proxy for persistent aridity |
title_sort |
extreme decay of meteoric beryllium-10 as a proxy for persistent aridity |
publisher |
Nature Publishing Group |
publishDate |
2015 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4673429/ http://www.ncbi.nlm.nih.gov/pubmed/26647733 https://doi.org/10.1038/srep17813 |
long_lat |
ENVELOPE(161.417,161.417,-77.750,-77.750) |
geographic |
Antarctic East Antarctic Ice Sheet Friis Hills |
geographic_facet |
Antarctic East Antarctic Ice Sheet Friis Hills |
genre |
Antarc* Antarctic Ice Sheet Tundra |
genre_facet |
Antarc* Antarctic Ice Sheet Tundra |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4673429/ http://www.ncbi.nlm.nih.gov/pubmed/26647733 http://dx.doi.org/10.1038/srep17813 |
op_rights |
Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/srep17813 |
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Scientific Reports |
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5 |
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