Radio-echo sounding of Crary Ice Rise reveals abundant marine ice in former ice shelf rifts and basal crevasses
Crary Ice Rise formed after the Ross Ice Shelf re-grounded ~1 kyr BP. We present new ice-penetrating radar data from two systems operating at center frequencies of 7 and 750 MHz that confirm the ice rise is composed of a former ice shelf buried by subsequent accumulation. Stacks of englacial diffrac...
Published in: | Journal of Glaciology |
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Online Access: | http://www.osti.gov/servlets/purl/1774446 https://www.osti.gov/biblio/1774446 https://doi.org/10.1017/jog.2021.17 |
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ftosti:oai:osti.gov:1774446 2023-07-30T03:59:18+02:00 Radio-echo sounding of Crary Ice Rise reveals abundant marine ice in former ice shelf rifts and basal crevasses Hillebrand, Trevor R. Conway, Howard Koutnik, Michelle Martín, Carlos Paden, John Winberry, J. Paul 2022-03-28 application/pdf http://www.osti.gov/servlets/purl/1774446 https://www.osti.gov/biblio/1774446 https://doi.org/10.1017/jog.2021.17 unknown http://www.osti.gov/servlets/purl/1774446 https://www.osti.gov/biblio/1774446 https://doi.org/10.1017/jog.2021.17 doi:10.1017/jog.2021.17 54 ENVIRONMENTAL SCIENCES 2022 ftosti https://doi.org/10.1017/jog.2021.17 2023-07-11T10:02:24Z Crary Ice Rise formed after the Ross Ice Shelf re-grounded ~1 kyr BP. We present new ice-penetrating radar data from two systems operating at center frequencies of 7 and 750 MHz that confirm the ice rise is composed of a former ice shelf buried by subsequent accumulation. Stacks of englacial diffraction hyperbolas are present almost everywhere across the central ice rise and extend up to ~350 m above the bed. In many cases, bed reflections beneath the diffraction hyperbolas are obscured for distances up to 1 km. Waveform modeling indicates that the diffraction hyperbolas are likely caused by marine ice deposits in former basal crevasses and rifts. The in-filling of rifts and basal crevasses may have strengthened the connection between the ice rise and the surrounding ice shelf, which could have influenced local and regional ice dynamics. Three internal reflection horizons mark the upper limit of disturbed ice and diffraction hyperbolas in different sections of the ice rise, indicating at least three stages of flow stabilization across the ice rise. A surface lineation visible in MODIS imagery corresponds spatially to deepening and strong deformation of these layers, consistent with the characteristics of former grounding lines observed elsewhere in Antarctica. Other/Unknown Material Antarc* Antarctica Ice Shelf Ross Ice Shelf SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Crary Ice Rise ENVELOPE(-172.500,-172.500,-82.933,-82.933) Ross Ice Shelf Journal of Glaciology 67 264 641 652 |
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Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
spellingShingle |
54 ENVIRONMENTAL SCIENCES Hillebrand, Trevor R. Conway, Howard Koutnik, Michelle Martín, Carlos Paden, John Winberry, J. Paul Radio-echo sounding of Crary Ice Rise reveals abundant marine ice in former ice shelf rifts and basal crevasses |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
Crary Ice Rise formed after the Ross Ice Shelf re-grounded ~1 kyr BP. We present new ice-penetrating radar data from two systems operating at center frequencies of 7 and 750 MHz that confirm the ice rise is composed of a former ice shelf buried by subsequent accumulation. Stacks of englacial diffraction hyperbolas are present almost everywhere across the central ice rise and extend up to ~350 m above the bed. In many cases, bed reflections beneath the diffraction hyperbolas are obscured for distances up to 1 km. Waveform modeling indicates that the diffraction hyperbolas are likely caused by marine ice deposits in former basal crevasses and rifts. The in-filling of rifts and basal crevasses may have strengthened the connection between the ice rise and the surrounding ice shelf, which could have influenced local and regional ice dynamics. Three internal reflection horizons mark the upper limit of disturbed ice and diffraction hyperbolas in different sections of the ice rise, indicating at least three stages of flow stabilization across the ice rise. A surface lineation visible in MODIS imagery corresponds spatially to deepening and strong deformation of these layers, consistent with the characteristics of former grounding lines observed elsewhere in Antarctica. |
author |
Hillebrand, Trevor R. Conway, Howard Koutnik, Michelle Martín, Carlos Paden, John Winberry, J. Paul |
author_facet |
Hillebrand, Trevor R. Conway, Howard Koutnik, Michelle Martín, Carlos Paden, John Winberry, J. Paul |
author_sort |
Hillebrand, Trevor R. |
title |
Radio-echo sounding of Crary Ice Rise reveals abundant marine ice in former ice shelf rifts and basal crevasses |
title_short |
Radio-echo sounding of Crary Ice Rise reveals abundant marine ice in former ice shelf rifts and basal crevasses |
title_full |
Radio-echo sounding of Crary Ice Rise reveals abundant marine ice in former ice shelf rifts and basal crevasses |
title_fullStr |
Radio-echo sounding of Crary Ice Rise reveals abundant marine ice in former ice shelf rifts and basal crevasses |
title_full_unstemmed |
Radio-echo sounding of Crary Ice Rise reveals abundant marine ice in former ice shelf rifts and basal crevasses |
title_sort |
radio-echo sounding of crary ice rise reveals abundant marine ice in former ice shelf rifts and basal crevasses |
publishDate |
2022 |
url |
http://www.osti.gov/servlets/purl/1774446 https://www.osti.gov/biblio/1774446 https://doi.org/10.1017/jog.2021.17 |
long_lat |
ENVELOPE(-172.500,-172.500,-82.933,-82.933) |
geographic |
Crary Ice Rise Ross Ice Shelf |
geographic_facet |
Crary Ice Rise Ross Ice Shelf |
genre |
Antarc* Antarctica Ice Shelf Ross Ice Shelf |
genre_facet |
Antarc* Antarctica Ice Shelf Ross Ice Shelf |
op_relation |
http://www.osti.gov/servlets/purl/1774446 https://www.osti.gov/biblio/1774446 https://doi.org/10.1017/jog.2021.17 doi:10.1017/jog.2021.17 |
op_doi |
https://doi.org/10.1017/jog.2021.17 |
container_title |
Journal of Glaciology |
container_volume |
67 |
container_issue |
264 |
container_start_page |
641 |
op_container_end_page |
652 |
_version_ |
1772810056132198400 |