ABSTRACT. Deep radar soundings as part of the International Trans-Antarctic Scientific Expedition (US-ITASE) traverses in West Antarctica have revealed a bright internal reflector that we have imaged throughout widespread locations across the ice sheet. The layer is seen in traverses emanating from...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.366.8547 2023-05-15T13:56:12+02:00 Robert W. Jacobel Brian C. Welch The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.366.8547 http://www.stolaf.edu/other/cegsic/publications/Annals_41/AnnalsGlac--Jacobel_Welch_2005_17.5kalayer_v41_p47.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.366.8547 http://www.stolaf.edu/other/cegsic/publications/Annals_41/AnnalsGlac--Jacobel_Welch_2005_17.5kalayer_v41_p47.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.stolaf.edu/other/cegsic/publications/Annals_41/AnnalsGlac--Jacobel_Welch_2005_17.5kalayer_v41_p47.pdf text ftciteseerx 2016-01-08T01:05:19Z ABSTRACT. Deep radar soundings as part of the International Trans-Antarctic Scientific Expedition (US-ITASE) traverses in West Antarctica have revealed a bright internal reflector that we have imaged throughout widespread locations across the ice sheet. The layer is seen in traverses emanating from Byrd Station in four directions and has been traced continuously for distances of 535 km toward the Weddell Sea drainage, 500 km toward South Pole, 150 km toward the Executive Committee Range and 160 km toward Kamb Ice Stream (former Ice Stream C). The approximate area encompassed by the layer identified in these studies is 250 000 km 2. If the layer identification can also be extended to Siple Dome where we have additional radar soundings (Jacobel and others, 2000), the approximate area covered would increase by 50%. In many locations echo strength from the layer rivals the bed echo in amplitude even though it generally lies at a depth greater than half the ice thickness. At Byrd Station, where the layer depth is 1260 m, an age of �17.5 kyr BP has been assigned based on the Blunier and Brook (2001) chronology. Hammer and others (1997) note that the acidity at this depth is>20 times the amplitude of any other part of the core. The depiction of this strong and widespread dated isochrone provides a unique time marker for much of the ice in West Antarctica. We apply a layer-tracing technique to infer the depth–time scale at the inland West Antarctic ice sheet divide and use this in a simple model to Text Antarc* Antarctic Antarctica Ice Sheet Ice Stream C Kamb Ice Stream South pole South pole Weddell Sea West Antarctica Unknown Antarctic Weddell Sea West Antarctica West Antarctic Ice Sheet Weddell South Pole Byrd Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) Byrd Station ENVELOPE(-119.533,-119.533,-80.017,-80.017) Siple Dome ENVELOPE(-148.833,-148.833,-81.667,-81.667) Kamb Ice Stream ENVELOPE(-145.000,-145.000,-82.250,-82.250) Executive Committee Range ENVELOPE(-126.000,-126.000,-76.500,-76.500) |
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Open Polar |
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Unknown |
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ftciteseerx |
language |
English |
description |
ABSTRACT. Deep radar soundings as part of the International Trans-Antarctic Scientific Expedition (US-ITASE) traverses in West Antarctica have revealed a bright internal reflector that we have imaged throughout widespread locations across the ice sheet. The layer is seen in traverses emanating from Byrd Station in four directions and has been traced continuously for distances of 535 km toward the Weddell Sea drainage, 500 km toward South Pole, 150 km toward the Executive Committee Range and 160 km toward Kamb Ice Stream (former Ice Stream C). The approximate area encompassed by the layer identified in these studies is 250 000 km 2. If the layer identification can also be extended to Siple Dome where we have additional radar soundings (Jacobel and others, 2000), the approximate area covered would increase by 50%. In many locations echo strength from the layer rivals the bed echo in amplitude even though it generally lies at a depth greater than half the ice thickness. At Byrd Station, where the layer depth is 1260 m, an age of �17.5 kyr BP has been assigned based on the Blunier and Brook (2001) chronology. Hammer and others (1997) note that the acidity at this depth is>20 times the amplitude of any other part of the core. The depiction of this strong and widespread dated isochrone provides a unique time marker for much of the ice in West Antarctica. We apply a layer-tracing technique to infer the depth–time scale at the inland West Antarctic ice sheet divide and use this in a simple model to |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Robert W. Jacobel Brian C. Welch |
spellingShingle |
Robert W. Jacobel Brian C. Welch |
author_facet |
Robert W. Jacobel Brian C. Welch |
author_sort |
Robert W. Jacobel |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.366.8547 http://www.stolaf.edu/other/cegsic/publications/Annals_41/AnnalsGlac--Jacobel_Welch_2005_17.5kalayer_v41_p47.pdf |
long_lat |
ENVELOPE(-83.917,-83.917,-75.917,-75.917) ENVELOPE(-119.533,-119.533,-80.017,-80.017) ENVELOPE(-148.833,-148.833,-81.667,-81.667) ENVELOPE(-145.000,-145.000,-82.250,-82.250) ENVELOPE(-126.000,-126.000,-76.500,-76.500) |
geographic |
Antarctic Weddell Sea West Antarctica West Antarctic Ice Sheet Weddell South Pole Byrd Siple Byrd Station Siple Dome Kamb Ice Stream Executive Committee Range |
geographic_facet |
Antarctic Weddell Sea West Antarctica West Antarctic Ice Sheet Weddell South Pole Byrd Siple Byrd Station Siple Dome Kamb Ice Stream Executive Committee Range |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Stream C Kamb Ice Stream South pole South pole Weddell Sea West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Stream C Kamb Ice Stream South pole South pole Weddell Sea West Antarctica |
op_source |
http://www.stolaf.edu/other/cegsic/publications/Annals_41/AnnalsGlac--Jacobel_Welch_2005_17.5kalayer_v41_p47.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.366.8547 http://www.stolaf.edu/other/cegsic/publications/Annals_41/AnnalsGlac--Jacobel_Welch_2005_17.5kalayer_v41_p47.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766263567957360640 |