Initial results from geophysical surveys and shallow coring of the Northeast Greenland Ice Stream (NEGIS)
The Northeast Greenland Ice Stream (NEGIS) is the sole interior Greenlandic ice stream. Fast flow initiates near the summit dome, and the ice stream terminates approximately 1000 km downstream in three large outlet glaciers that calve into the Greenland Sea. To better understand this important syste...
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ftdoajarticles:oai:doaj.org/article:ae5deb3132da4fffa4b8cf153bd0399a 2023-05-15T16:26:05+02:00 Initial results from geophysical surveys and shallow coring of the Northeast Greenland Ice Stream (NEGIS) P. Vallelonga K. Christianson R. B. Alley S. Anandakrishnan J. E. M. Christian D. Dahl-Jensen V. Gkinis C. Holme R. W. Jacobel N. B. Karlsson B. A. Keisling S. Kipfstuhl H. A. Kjær M. E. L. Kristensen A. Muto L. E. Peters T. Popp K. L. Riverman A. M. Svensson C. Tibuleac B. M. Vinther Y. Weng M. Winstrup 2014-07-01T00:00:00Z https://doi.org/10.5194/tc-8-1275-2014 https://doaj.org/article/ae5deb3132da4fffa4b8cf153bd0399a EN eng Copernicus Publications http://www.the-cryosphere.net/8/1275/2014/tc-8-1275-2014.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-8-1275-2014 https://doaj.org/article/ae5deb3132da4fffa4b8cf153bd0399a The Cryosphere, Vol 8, Iss 4, Pp 1275-1287 (2014) Environmental sciences GE1-350 Geology QE1-996.5 article 2014 ftdoajarticles https://doi.org/10.5194/tc-8-1275-2014 2022-12-31T10:17:03Z The Northeast Greenland Ice Stream (NEGIS) is the sole interior Greenlandic ice stream. Fast flow initiates near the summit dome, and the ice stream terminates approximately 1000 km downstream in three large outlet glaciers that calve into the Greenland Sea. To better understand this important system, in the summer of 2012 we drilled a 67 m firn core and conducted ground-based radio-echo sounding (RES) and active-source seismic surveys at a site approximately 150 km downstream from the onset of streaming flow (NEGIS firn core, 75°37.61' N, 35°56.49' W). The site is representative of the upper part of the ice stream, while also being in a crevasse-free area for safe surface operations. Annual cycles were observed for insoluble dust, sodium and ammonium concentrations and for electrolytic conductivity, allowing a seasonally resolved chronology covering the past 400 yr. Annual layer thicknesses averaged 0.11 m ice equivalent (i.e.) for the period 1607–2011, although accumulation varied between 0.08 and 0.14 m i.e., likely due to flow-related changes in surface topography. Tracing of RES layers from the NGRIP (North Greenland Ice Core Project) ice core site shows that the ice at NEGIS preserves a climatic record of at least the past 51 kyr. We demonstrate that deep ice core drilling in this location can provide a reliable Holocene and late-glacial climate record, as well as helping to constrain the past dynamics and ice–lithosphere interactions of the Greenland Ice Sheet. Article in Journal/Newspaper Greenland Greenland ice core Greenland Ice core Project Greenland Sea greenlandic ice core Ice Sheet NGRIP North Greenland North Greenland Ice Core Project The Cryosphere Directory of Open Access Journals: DOAJ Articles Greenland The Cryosphere 8 4 1275 1287 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 P. Vallelonga K. Christianson R. B. Alley S. Anandakrishnan J. E. M. Christian D. Dahl-Jensen V. Gkinis C. Holme R. W. Jacobel N. B. Karlsson B. A. Keisling S. Kipfstuhl H. A. Kjær M. E. L. Kristensen A. Muto L. E. Peters T. Popp K. L. Riverman A. M. Svensson C. Tibuleac B. M. Vinther Y. Weng M. Winstrup Initial results from geophysical surveys and shallow coring of the Northeast Greenland Ice Stream (NEGIS) |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
The Northeast Greenland Ice Stream (NEGIS) is the sole interior Greenlandic ice stream. Fast flow initiates near the summit dome, and the ice stream terminates approximately 1000 km downstream in three large outlet glaciers that calve into the Greenland Sea. To better understand this important system, in the summer of 2012 we drilled a 67 m firn core and conducted ground-based radio-echo sounding (RES) and active-source seismic surveys at a site approximately 150 km downstream from the onset of streaming flow (NEGIS firn core, 75°37.61' N, 35°56.49' W). The site is representative of the upper part of the ice stream, while also being in a crevasse-free area for safe surface operations. Annual cycles were observed for insoluble dust, sodium and ammonium concentrations and for electrolytic conductivity, allowing a seasonally resolved chronology covering the past 400 yr. Annual layer thicknesses averaged 0.11 m ice equivalent (i.e.) for the period 1607–2011, although accumulation varied between 0.08 and 0.14 m i.e., likely due to flow-related changes in surface topography. Tracing of RES layers from the NGRIP (North Greenland Ice Core Project) ice core site shows that the ice at NEGIS preserves a climatic record of at least the past 51 kyr. We demonstrate that deep ice core drilling in this location can provide a reliable Holocene and late-glacial climate record, as well as helping to constrain the past dynamics and ice–lithosphere interactions of the Greenland Ice Sheet. |
format |
Article in Journal/Newspaper |
author |
P. Vallelonga K. Christianson R. B. Alley S. Anandakrishnan J. E. M. Christian D. Dahl-Jensen V. Gkinis C. Holme R. W. Jacobel N. B. Karlsson B. A. Keisling S. Kipfstuhl H. A. Kjær M. E. L. Kristensen A. Muto L. E. Peters T. Popp K. L. Riverman A. M. Svensson C. Tibuleac B. M. Vinther Y. Weng M. Winstrup |
author_facet |
P. Vallelonga K. Christianson R. B. Alley S. Anandakrishnan J. E. M. Christian D. Dahl-Jensen V. Gkinis C. Holme R. W. Jacobel N. B. Karlsson B. A. Keisling S. Kipfstuhl H. A. Kjær M. E. L. Kristensen A. Muto L. E. Peters T. Popp K. L. Riverman A. M. Svensson C. Tibuleac B. M. Vinther Y. Weng M. Winstrup |
author_sort |
P. Vallelonga |
title |
Initial results from geophysical surveys and shallow coring of the Northeast Greenland Ice Stream (NEGIS) |
title_short |
Initial results from geophysical surveys and shallow coring of the Northeast Greenland Ice Stream (NEGIS) |
title_full |
Initial results from geophysical surveys and shallow coring of the Northeast Greenland Ice Stream (NEGIS) |
title_fullStr |
Initial results from geophysical surveys and shallow coring of the Northeast Greenland Ice Stream (NEGIS) |
title_full_unstemmed |
Initial results from geophysical surveys and shallow coring of the Northeast Greenland Ice Stream (NEGIS) |
title_sort |
initial results from geophysical surveys and shallow coring of the northeast greenland ice stream (negis) |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/tc-8-1275-2014 https://doaj.org/article/ae5deb3132da4fffa4b8cf153bd0399a |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core Greenland Ice core Project Greenland Sea greenlandic ice core Ice Sheet NGRIP North Greenland North Greenland Ice Core Project The Cryosphere |
genre_facet |
Greenland Greenland ice core Greenland Ice core Project Greenland Sea greenlandic ice core Ice Sheet NGRIP North Greenland North Greenland Ice Core Project The Cryosphere |
op_source |
The Cryosphere, Vol 8, Iss 4, Pp 1275-1287 (2014) |
op_relation |
http://www.the-cryosphere.net/8/1275/2014/tc-8-1275-2014.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-8-1275-2014 https://doaj.org/article/ae5deb3132da4fffa4b8cf153bd0399a |
op_doi |
https://doi.org/10.5194/tc-8-1275-2014 |
container_title |
The Cryosphere |
container_volume |
8 |
container_issue |
4 |
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1275 |
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1287 |
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1766014960769433600 |