Beryllium-10 in the Taylor Dome ice core: Applications to Antarctic glaciology and paleoclimatology
An ice core was drilled at Taylor dome, East Antarctica, reaching to bedrock at 554 meters. Oxygen-isotope measurements reveal climatic fluctuations through the last interglacial period. To facilitate comparison of the Taylor Dome paleoclimate record with geologic data and results from other deep ic...
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ftosti:oai:osti.gov:527444 2023-07-30T03:57:58+02:00 Beryllium-10 in the Taylor Dome ice core: Applications to Antarctic glaciology and paleoclimatology Steig, E.J. 2009-11-12 application/pdf http://www.osti.gov/servlets/purl/527444 https://www.osti.gov/biblio/527444 https://doi.org/10.2172/527444 unknown http://www.osti.gov/servlets/purl/527444 https://www.osti.gov/biblio/527444 https://doi.org/10.2172/527444 doi:10.2172/527444 58 GEOSCIENCES ;54 ENVIRONMENTAL SCIENCES ICE CAPS PALEOCLIMATOLOGY GEOCHEMISTRY ANTARCTICA GLACIERS BERYLLIUM 10 ECOLOGICAL CONCENTRATION CLIMATIC CHANGE EXPERIMENTAL DATA 2009 ftosti https://doi.org/10.2172/527444 2023-07-11T08:34:39Z An ice core was drilled at Taylor dome, East Antarctica, reaching to bedrock at 554 meters. Oxygen-isotope measurements reveal climatic fluctuations through the last interglacial period. To facilitate comparison of the Taylor Dome paleoclimate record with geologic data and results from other deep ice cores, several glaciological issues need to be addressed. In particular, accumulation data are necessary as input for numerical ice-flow-models, for determining the flux of chemical constituents from measured concentrations, and for calculation of the offset in age between ice and trapped air in the core. The analysis of cosmogenic beryllium-10 provides a geochemical method for constraining the accumulation-rate history at Taylor Dome. High-resolution measurements were made in shallow firn cores and snow pits to determine the relationship among beryllium-10 concentrations, wet and dry deposition mechanisms, and snow-accumulation rates. Comparison between theoretical and measured variations in deposition over the last 75 years constrains the relationship between beryllium-10 deposition and global average production rates. The results indicate that variations in geomagnetically-modulated production-rate do not strongly influence beryllium-10 deposition at Taylor Dome. Although solar modulation of production rate is important for time scales of years to centuries, snow-accumulation rate is the dominant control on ice-core beryllium-10 concentrations for longer periods. Results show that the Taylor Dome core can be used to provide new constraints on regional climate over the last 130,000 years, complementing the terrestrial and marine geological record from the Dry Valley, Transantarctic Mountains and western Ross Sea. Other/Unknown Material Antarc* Antarctic Antarctica East Antarctica ice core Ross Sea SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Antarctic East Antarctica Ross Sea Transantarctic Mountains Taylor Dome ENVELOPE(157.667,157.667,-77.667,-77.667) |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
58 GEOSCIENCES ;54 ENVIRONMENTAL SCIENCES ICE CAPS PALEOCLIMATOLOGY GEOCHEMISTRY ANTARCTICA GLACIERS BERYLLIUM 10 ECOLOGICAL CONCENTRATION CLIMATIC CHANGE EXPERIMENTAL DATA |
spellingShingle |
58 GEOSCIENCES ;54 ENVIRONMENTAL SCIENCES ICE CAPS PALEOCLIMATOLOGY GEOCHEMISTRY ANTARCTICA GLACIERS BERYLLIUM 10 ECOLOGICAL CONCENTRATION CLIMATIC CHANGE EXPERIMENTAL DATA Steig, E.J. Beryllium-10 in the Taylor Dome ice core: Applications to Antarctic glaciology and paleoclimatology |
topic_facet |
58 GEOSCIENCES ;54 ENVIRONMENTAL SCIENCES ICE CAPS PALEOCLIMATOLOGY GEOCHEMISTRY ANTARCTICA GLACIERS BERYLLIUM 10 ECOLOGICAL CONCENTRATION CLIMATIC CHANGE EXPERIMENTAL DATA |
description |
An ice core was drilled at Taylor dome, East Antarctica, reaching to bedrock at 554 meters. Oxygen-isotope measurements reveal climatic fluctuations through the last interglacial period. To facilitate comparison of the Taylor Dome paleoclimate record with geologic data and results from other deep ice cores, several glaciological issues need to be addressed. In particular, accumulation data are necessary as input for numerical ice-flow-models, for determining the flux of chemical constituents from measured concentrations, and for calculation of the offset in age between ice and trapped air in the core. The analysis of cosmogenic beryllium-10 provides a geochemical method for constraining the accumulation-rate history at Taylor Dome. High-resolution measurements were made in shallow firn cores and snow pits to determine the relationship among beryllium-10 concentrations, wet and dry deposition mechanisms, and snow-accumulation rates. Comparison between theoretical and measured variations in deposition over the last 75 years constrains the relationship between beryllium-10 deposition and global average production rates. The results indicate that variations in geomagnetically-modulated production-rate do not strongly influence beryllium-10 deposition at Taylor Dome. Although solar modulation of production rate is important for time scales of years to centuries, snow-accumulation rate is the dominant control on ice-core beryllium-10 concentrations for longer periods. Results show that the Taylor Dome core can be used to provide new constraints on regional climate over the last 130,000 years, complementing the terrestrial and marine geological record from the Dry Valley, Transantarctic Mountains and western Ross Sea. |
author |
Steig, E.J. |
author_facet |
Steig, E.J. |
author_sort |
Steig, E.J. |
title |
Beryllium-10 in the Taylor Dome ice core: Applications to Antarctic glaciology and paleoclimatology |
title_short |
Beryllium-10 in the Taylor Dome ice core: Applications to Antarctic glaciology and paleoclimatology |
title_full |
Beryllium-10 in the Taylor Dome ice core: Applications to Antarctic glaciology and paleoclimatology |
title_fullStr |
Beryllium-10 in the Taylor Dome ice core: Applications to Antarctic glaciology and paleoclimatology |
title_full_unstemmed |
Beryllium-10 in the Taylor Dome ice core: Applications to Antarctic glaciology and paleoclimatology |
title_sort |
beryllium-10 in the taylor dome ice core: applications to antarctic glaciology and paleoclimatology |
publishDate |
2009 |
url |
http://www.osti.gov/servlets/purl/527444 https://www.osti.gov/biblio/527444 https://doi.org/10.2172/527444 |
long_lat |
ENVELOPE(157.667,157.667,-77.667,-77.667) |
geographic |
Antarctic East Antarctica Ross Sea Transantarctic Mountains Taylor Dome |
geographic_facet |
Antarctic East Antarctica Ross Sea Transantarctic Mountains Taylor Dome |
genre |
Antarc* Antarctic Antarctica East Antarctica ice core Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica ice core Ross Sea |
op_relation |
http://www.osti.gov/servlets/purl/527444 https://www.osti.gov/biblio/527444 https://doi.org/10.2172/527444 doi:10.2172/527444 |
op_doi |
https://doi.org/10.2172/527444 |
_version_ |
1772820570990182400 |