Locating subglacial sediments across West Antarctica with isostatic gravity anomalies
Subglacial sediments are an important control on fast flowing ice in West Antarctica but their spatial distribution over catchment-wide areas is still largely unknown. Previously, airborne gravity anomalies could not clearly image sedimentary basins beneath the ice because broad, crustal-scale gravi...
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2007
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ftnerc:oai:nora.nerc.ac.uk:536761 2024-02-11T09:55:19+01:00 Locating subglacial sediments across West Antarctica with isostatic gravity anomalies Diehl, T.M. Blankenship, D.D. Holt, J.W. Young, D.A. Jordan, Tom A. Ferraccioli, Fausto Cooper, A.K. Raymond, C.R. 2007 http://nora.nerc.ac.uk/id/eprint/536761/ http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea107.pdf unknown National Academy Press Diehl, T.M.; Blankenship, D.D.; Holt, J.W.; Young, D.A.; Jordan, Tom A. orcid:0000-0003-2780-1986 Ferraccioli, Fausto orcid:0000-0002-9347-4736 . 2007 Locating subglacial sediments across West Antarctica with isostatic gravity anomalies. In: Cooper, A.K.; Raymond, C.R., (eds.) Antarctica: a keystone in a changing world. Online proceedings of the 10th International Symposium on Antarctic Earth Sciences, Santa Barbara, California, August 26 - September 1, 2007. National Academy Press, 4pp. (U.S. Geological Survey Open-File Report, 2007-1047). Glaciology Publication - Book Section NonPeerReviewed 2007 ftnerc 2024-01-26T00:03:28Z Subglacial sediments are an important control on fast flowing ice in West Antarctica but their spatial distribution over catchment-wide areas is still largely unknown. Previously, airborne gravity anomalies could not clearly image sedimentary basins beneath the ice because broad, crustal-scale gravity signals masked the nearsurface anomalies. We show here that it is possible to use additional processing to produce an isostatic gravity anomaly, which is sensitive to the locations of sedimentary basins. Our results reveal that the inferred major basin beneath Thwaites Glacier is confined to the Byrd Subglacial Basin, but that there are also basins underlying the onset of tributary fast flow. In the Ross Sea Embayment, known sedimentary basins coincide with negative isostatic anomalies. The sedimentary basins beneath the Ross Sea Embayment ice streams are more widespread and likely have a greater sediment thickness than the basins beneath Thwaites Glacier in the Amundsen Sea Embayment. Book Part Amundsen Sea Antarc* Antarctica Ross Sea Thwaites Glacier West Antarctica Natural Environment Research Council: NERC Open Research Archive Amundsen Sea Byrd Byrd Subglacial Basin ENVELOPE(-115.000,-115.000,-80.000,-80.000) Ross Sea Thwaites Glacier ENVELOPE(-106.750,-106.750,-75.500,-75.500) West Antarctica |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Glaciology |
spellingShingle |
Glaciology Diehl, T.M. Blankenship, D.D. Holt, J.W. Young, D.A. Jordan, Tom A. Ferraccioli, Fausto Locating subglacial sediments across West Antarctica with isostatic gravity anomalies |
topic_facet |
Glaciology |
description |
Subglacial sediments are an important control on fast flowing ice in West Antarctica but their spatial distribution over catchment-wide areas is still largely unknown. Previously, airborne gravity anomalies could not clearly image sedimentary basins beneath the ice because broad, crustal-scale gravity signals masked the nearsurface anomalies. We show here that it is possible to use additional processing to produce an isostatic gravity anomaly, which is sensitive to the locations of sedimentary basins. Our results reveal that the inferred major basin beneath Thwaites Glacier is confined to the Byrd Subglacial Basin, but that there are also basins underlying the onset of tributary fast flow. In the Ross Sea Embayment, known sedimentary basins coincide with negative isostatic anomalies. The sedimentary basins beneath the Ross Sea Embayment ice streams are more widespread and likely have a greater sediment thickness than the basins beneath Thwaites Glacier in the Amundsen Sea Embayment. |
author2 |
Cooper, A.K. Raymond, C.R. |
format |
Book Part |
author |
Diehl, T.M. Blankenship, D.D. Holt, J.W. Young, D.A. Jordan, Tom A. Ferraccioli, Fausto |
author_facet |
Diehl, T.M. Blankenship, D.D. Holt, J.W. Young, D.A. Jordan, Tom A. Ferraccioli, Fausto |
author_sort |
Diehl, T.M. |
title |
Locating subglacial sediments across West Antarctica with isostatic gravity anomalies |
title_short |
Locating subglacial sediments across West Antarctica with isostatic gravity anomalies |
title_full |
Locating subglacial sediments across West Antarctica with isostatic gravity anomalies |
title_fullStr |
Locating subglacial sediments across West Antarctica with isostatic gravity anomalies |
title_full_unstemmed |
Locating subglacial sediments across West Antarctica with isostatic gravity anomalies |
title_sort |
locating subglacial sediments across west antarctica with isostatic gravity anomalies |
publisher |
National Academy Press |
publishDate |
2007 |
url |
http://nora.nerc.ac.uk/id/eprint/536761/ http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea107.pdf |
long_lat |
ENVELOPE(-115.000,-115.000,-80.000,-80.000) ENVELOPE(-106.750,-106.750,-75.500,-75.500) |
geographic |
Amundsen Sea Byrd Byrd Subglacial Basin Ross Sea Thwaites Glacier West Antarctica |
geographic_facet |
Amundsen Sea Byrd Byrd Subglacial Basin Ross Sea Thwaites Glacier West Antarctica |
genre |
Amundsen Sea Antarc* Antarctica Ross Sea Thwaites Glacier West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctica Ross Sea Thwaites Glacier West Antarctica |
op_relation |
Diehl, T.M.; Blankenship, D.D.; Holt, J.W.; Young, D.A.; Jordan, Tom A. orcid:0000-0003-2780-1986 Ferraccioli, Fausto orcid:0000-0002-9347-4736 . 2007 Locating subglacial sediments across West Antarctica with isostatic gravity anomalies. In: Cooper, A.K.; Raymond, C.R., (eds.) Antarctica: a keystone in a changing world. Online proceedings of the 10th International Symposium on Antarctic Earth Sciences, Santa Barbara, California, August 26 - September 1, 2007. National Academy Press, 4pp. (U.S. Geological Survey Open-File Report, 2007-1047). |
_version_ |
1790594979188441088 |