Radio-echo sounding and waveform modeling reveal abundant marine ice in former rifts and basal crevasses within Crary Ice Rise, Antarctica
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 |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press
2021
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/530734/ https://nora.nerc.ac.uk/id/eprint/530734/1/radio-echo-sounding-and-waveform-modeling-reveal-abundant-marine-ice-in-former-rifts-and-basal-crevasses-within-crary-ice-rise-antarctica.pdf https://www.cambridge.org/core/journals/journal-of-glaciology/article/radioecho-sounding-and-waveform-modeling-reveal-abundant-marine-ice-in-former-rifts-and-basal-crevasses-within-crary-ice-rise-antarctica/58EC2C0B0E16F11864FF82391FC3AB50 |
id |
ftnerc:oai:nora.nerc.ac.uk:530734 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:530734 2023-05-15T13:41:45+02:00 Radio-echo sounding and waveform modeling reveal abundant marine ice in former rifts and basal crevasses within Crary Ice Rise, Antarctica Hillebrand, Trevor R. Conway, Howard Koutnik, Michelle Martín, Carlos Paden, John Winberry, J. Paul 2021-08 text http://nora.nerc.ac.uk/id/eprint/530734/ https://nora.nerc.ac.uk/id/eprint/530734/1/radio-echo-sounding-and-waveform-modeling-reveal-abundant-marine-ice-in-former-rifts-and-basal-crevasses-within-crary-ice-rise-antarctica.pdf https://www.cambridge.org/core/journals/journal-of-glaciology/article/radioecho-sounding-and-waveform-modeling-reveal-abundant-marine-ice-in-former-rifts-and-basal-crevasses-within-crary-ice-rise-antarctica/58EC2C0B0E16F11864FF82391FC3AB50 en eng Cambridge University Press https://nora.nerc.ac.uk/id/eprint/530734/1/radio-echo-sounding-and-waveform-modeling-reveal-abundant-marine-ice-in-former-rifts-and-basal-crevasses-within-crary-ice-rise-antarctica.pdf Hillebrand, Trevor R.; Conway, Howard; Koutnik, Michelle; Martín, Carlos orcid:0000-0002-2661-169X Paden, John; Winberry, J. Paul. 2021 Radio-echo sounding and waveform modeling reveal abundant marine ice in former rifts and basal crevasses within Crary Ice Rise, Antarctica. Journal of Glaciology, 67 (264). 641-652. https://doi.org/10.1017/jog.2021.17 <https://doi.org/10.1017/jog.2021.17> cc_by_4 CC-BY Publication - Article PeerReviewed 2021 ftnerc https://doi.org/10.1017/jog.2021.17 2023-02-04T19:52:20Z 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. Article in Journal/Newspaper Antarc* Antarctica Antarctica Journal Ice Shelf Journal of Glaciology Ross Ice Shelf Natural Environment Research Council: NERC Open Research Archive Crary Ice Rise ENVELOPE(-172.500,-172.500,-82.933,-82.933) Ross Ice Shelf Journal of Glaciology 67 264 641 652 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
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. |
format |
Article in Journal/Newspaper |
author |
Hillebrand, Trevor R. Conway, Howard Koutnik, Michelle Martín, Carlos Paden, John Winberry, J. Paul |
spellingShingle |
Hillebrand, Trevor R. Conway, Howard Koutnik, Michelle Martín, Carlos Paden, John Winberry, J. Paul Radio-echo sounding and waveform modeling reveal abundant marine ice in former rifts and basal crevasses within Crary Ice Rise, Antarctica |
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 and waveform modeling reveal abundant marine ice in former rifts and basal crevasses within Crary Ice Rise, Antarctica |
title_short |
Radio-echo sounding and waveform modeling reveal abundant marine ice in former rifts and basal crevasses within Crary Ice Rise, Antarctica |
title_full |
Radio-echo sounding and waveform modeling reveal abundant marine ice in former rifts and basal crevasses within Crary Ice Rise, Antarctica |
title_fullStr |
Radio-echo sounding and waveform modeling reveal abundant marine ice in former rifts and basal crevasses within Crary Ice Rise, Antarctica |
title_full_unstemmed |
Radio-echo sounding and waveform modeling reveal abundant marine ice in former rifts and basal crevasses within Crary Ice Rise, Antarctica |
title_sort |
radio-echo sounding and waveform modeling reveal abundant marine ice in former rifts and basal crevasses within crary ice rise, antarctica |
publisher |
Cambridge University Press |
publishDate |
2021 |
url |
http://nora.nerc.ac.uk/id/eprint/530734/ https://nora.nerc.ac.uk/id/eprint/530734/1/radio-echo-sounding-and-waveform-modeling-reveal-abundant-marine-ice-in-former-rifts-and-basal-crevasses-within-crary-ice-rise-antarctica.pdf https://www.cambridge.org/core/journals/journal-of-glaciology/article/radioecho-sounding-and-waveform-modeling-reveal-abundant-marine-ice-in-former-rifts-and-basal-crevasses-within-crary-ice-rise-antarctica/58EC2C0B0E16F11864FF82391FC3AB50 |
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 Antarctica Journal Ice Shelf Journal of Glaciology Ross Ice Shelf |
genre_facet |
Antarc* Antarctica Antarctica Journal Ice Shelf Journal of Glaciology Ross Ice Shelf |
op_relation |
https://nora.nerc.ac.uk/id/eprint/530734/1/radio-echo-sounding-and-waveform-modeling-reveal-abundant-marine-ice-in-former-rifts-and-basal-crevasses-within-crary-ice-rise-antarctica.pdf Hillebrand, Trevor R.; Conway, Howard; Koutnik, Michelle; Martín, Carlos orcid:0000-0002-2661-169X Paden, John; Winberry, J. Paul. 2021 Radio-echo sounding and waveform modeling reveal abundant marine ice in former rifts and basal crevasses within Crary Ice Rise, Antarctica. Journal of Glaciology, 67 (264). 641-652. https://doi.org/10.1017/jog.2021.17 <https://doi.org/10.1017/jog.2021.17> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
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_ |
1766157521952702464 |