Variation of Accumulation Rates Over the Last Eight Centuries on the East Antarctic Plateau Derived from Volcanic Signals in Ice Cores
Volcanic signatures in ice-core records provide an excellent means to date the cores and obtain information about accumulation rates. From several ice cores it is thus possible to extract a spatio-temporal accumulation pattern. We show records of electrical conductivity and sulfur from firn cores fr...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20120002570 2023-05-15T14:05:05+02:00 Variation of Accumulation Rates Over the Last Eight Centuries on the East Antarctic Plateau Derived from Volcanic Signals in Ice Cores Winther, J.-G. Bisiaux, M. M. Isaksson, E. McConnell, J. R. Neumann, T. A. Sinisalo, A. Hamran, S.-E. Pasteris, D. Anschuetz, H. Unclassified, Unlimited, Publicly available July 19, 2011 application/pdf http://hdl.handle.net/2060/20120002570 unknown Document ID: 20120002570 http://hdl.handle.net/2060/20120002570 Copyright, Distribution as joint owner in the copyright CASI Meteorology and Climatology GSFC.JA.5663.2011 2011 ftnasantrs 2019-07-21T06:23:11Z Volcanic signatures in ice-core records provide an excellent means to date the cores and obtain information about accumulation rates. From several ice cores it is thus possible to extract a spatio-temporal accumulation pattern. We show records of electrical conductivity and sulfur from firn cores from the Norwegian-USA scientific traverse during the International Polar Year 2007-2009 (IPY) through East Antarctica. Major volcanic eruptions are identified and used to assess century-scale accumulation changes. The largest changes seem to occur in the most recent decades with accumulation over the period 1963- 2007/08 being up to 25 % different from the long-term record. There is no clear overall trend, some sites show an increase in accumulation over the period 1963 to present while others show a decrease. Almost all of the sites above 3200 m above sea level (asl) suggest a decrease. These sites also show a significantly lower accumulation value than large-scale assessments both for the period 1963 to present and for the long-term mean at the respective drill sites. The spatial accumulation distribution is influenced mainly by elevation and distance to the ocean (continentality), as expected. Ground-penetrating radar data around the drill sites show a spatial variability within 10-20 % over several tens of kilometers, indicating that our drill sites are well representative for the area around them. Our results are important for large-scale assessments of Antarctic mass balance and model validation. Other/Unknown Material Antarc* Antarctic Antarctica East Antarctica ice core International Polar Year IPY NASA Technical Reports Server (NTRS) Antarctic East Antarctica |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Meteorology and Climatology |
spellingShingle |
Meteorology and Climatology Winther, J.-G. Bisiaux, M. M. Isaksson, E. McConnell, J. R. Neumann, T. A. Sinisalo, A. Hamran, S.-E. Pasteris, D. Anschuetz, H. Variation of Accumulation Rates Over the Last Eight Centuries on the East Antarctic Plateau Derived from Volcanic Signals in Ice Cores |
topic_facet |
Meteorology and Climatology |
description |
Volcanic signatures in ice-core records provide an excellent means to date the cores and obtain information about accumulation rates. From several ice cores it is thus possible to extract a spatio-temporal accumulation pattern. We show records of electrical conductivity and sulfur from firn cores from the Norwegian-USA scientific traverse during the International Polar Year 2007-2009 (IPY) through East Antarctica. Major volcanic eruptions are identified and used to assess century-scale accumulation changes. The largest changes seem to occur in the most recent decades with accumulation over the period 1963- 2007/08 being up to 25 % different from the long-term record. There is no clear overall trend, some sites show an increase in accumulation over the period 1963 to present while others show a decrease. Almost all of the sites above 3200 m above sea level (asl) suggest a decrease. These sites also show a significantly lower accumulation value than large-scale assessments both for the period 1963 to present and for the long-term mean at the respective drill sites. The spatial accumulation distribution is influenced mainly by elevation and distance to the ocean (continentality), as expected. Ground-penetrating radar data around the drill sites show a spatial variability within 10-20 % over several tens of kilometers, indicating that our drill sites are well representative for the area around them. Our results are important for large-scale assessments of Antarctic mass balance and model validation. |
format |
Other/Unknown Material |
author |
Winther, J.-G. Bisiaux, M. M. Isaksson, E. McConnell, J. R. Neumann, T. A. Sinisalo, A. Hamran, S.-E. Pasteris, D. Anschuetz, H. |
author_facet |
Winther, J.-G. Bisiaux, M. M. Isaksson, E. McConnell, J. R. Neumann, T. A. Sinisalo, A. Hamran, S.-E. Pasteris, D. Anschuetz, H. |
author_sort |
Winther, J.-G. |
title |
Variation of Accumulation Rates Over the Last Eight Centuries on the East Antarctic Plateau Derived from Volcanic Signals in Ice Cores |
title_short |
Variation of Accumulation Rates Over the Last Eight Centuries on the East Antarctic Plateau Derived from Volcanic Signals in Ice Cores |
title_full |
Variation of Accumulation Rates Over the Last Eight Centuries on the East Antarctic Plateau Derived from Volcanic Signals in Ice Cores |
title_fullStr |
Variation of Accumulation Rates Over the Last Eight Centuries on the East Antarctic Plateau Derived from Volcanic Signals in Ice Cores |
title_full_unstemmed |
Variation of Accumulation Rates Over the Last Eight Centuries on the East Antarctic Plateau Derived from Volcanic Signals in Ice Cores |
title_sort |
variation of accumulation rates over the last eight centuries on the east antarctic plateau derived from volcanic signals in ice cores |
publishDate |
2011 |
url |
http://hdl.handle.net/2060/20120002570 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Antarctic East Antarctica |
geographic_facet |
Antarctic East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica ice core International Polar Year IPY |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica ice core International Polar Year IPY |
op_source |
CASI |
op_relation |
Document ID: 20120002570 http://hdl.handle.net/2060/20120002570 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766276727210770432 |