Surface and basal boundary conditions at the Southern McMurdo and Ross Ice Shelves, Antarctica
We derive the surface and basal radar reflectance and backscatter coefficients of the southern McMurdo Ice Shelf (SMIS) and part of the nearby Ross Ice Shelf (RIS), Antarctica, from radar statistical reconnaissance using a 60-MHZ airborne survey. The surface coefficients are further inverted in term...
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Cambridge University Press
2019
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ftdoajarticles:oai:doaj.org/article:5da463d1217d48f8899a07af8814fa8a 2023-05-15T13:49:16+02:00 Surface and basal boundary conditions at the Southern McMurdo and Ross Ice Shelves, Antarctica C. GRIMA I. KOCH J. S. GREENBAUM K. M. SODERLUND D. D. BLANKENSHIP D. A. YOUNG D. M. SCHROEDER S. FITZSIMONS 2019-08-01T00:00:00Z https://doi.org/10.1017/jog.2019.44 https://doaj.org/article/5da463d1217d48f8899a07af8814fa8a EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143019000443/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2019.44 0022-1430 1727-5652 https://doaj.org/article/5da463d1217d48f8899a07af8814fa8a Journal of Glaciology, Vol 65, Pp 675-688 (2019) basal ice shelf processes radar roughness surface Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2019 ftdoajarticles https://doi.org/10.1017/jog.2019.44 2023-03-12T01:30:57Z We derive the surface and basal radar reflectance and backscatter coefficients of the southern McMurdo Ice Shelf (SMIS) and part of the nearby Ross Ice Shelf (RIS), Antarctica, from radar statistical reconnaissance using a 60-MHZ airborne survey. The surface coefficients are further inverted in terms of snow density and roughness, providing a spatial distribution of the processes contributing to the surface boundary conditions. We disentangle the basal coefficients from surface transmission losses, and we provide the basal coherent content, an indicator of the boundary geometric disorder that is also self-corrected from englacial attenuation. The basal radar properties exhibit sharp gradients along specific iso-depths, suggesting an abrupt modification of the ice composition and geometric structure. We interpret this behavior as locations where the pressure-melting point is reached, outlining fields of freezing and melting ice. Basal steps are observed at both SMIS and RIS, suggesting a common geometric expression of widespread basal processes. This technique offers a simultaneous view of both the surface and basal boundary conditions to help investigate the ice-shelf stability, while its application to airborne data significantly improves coverage of the difficult-to-observe ice–ocean boundary. It also provides constraints on thermohaline circulation in ice shelves cavities, which are analogs for ice-covered ocean worlds. Article in Journal/Newspaper Antarc* Antarctica Ice Shelf Ice Shelves Journal of Glaciology McMurdo Ice Shelf Ross Ice Shelf Directory of Open Access Journals: DOAJ Articles Ross Ice Shelf McMurdo Ice Shelf ENVELOPE(166.500,166.500,-78.000,-78.000) Journal of Glaciology 65 252 675 688 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
basal ice shelf processes radar roughness surface Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
basal ice shelf processes radar roughness surface Environmental sciences GE1-350 Meteorology. Climatology QC851-999 C. GRIMA I. KOCH J. S. GREENBAUM K. M. SODERLUND D. D. BLANKENSHIP D. A. YOUNG D. M. SCHROEDER S. FITZSIMONS Surface and basal boundary conditions at the Southern McMurdo and Ross Ice Shelves, Antarctica |
topic_facet |
basal ice shelf processes radar roughness surface Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
We derive the surface and basal radar reflectance and backscatter coefficients of the southern McMurdo Ice Shelf (SMIS) and part of the nearby Ross Ice Shelf (RIS), Antarctica, from radar statistical reconnaissance using a 60-MHZ airborne survey. The surface coefficients are further inverted in terms of snow density and roughness, providing a spatial distribution of the processes contributing to the surface boundary conditions. We disentangle the basal coefficients from surface transmission losses, and we provide the basal coherent content, an indicator of the boundary geometric disorder that is also self-corrected from englacial attenuation. The basal radar properties exhibit sharp gradients along specific iso-depths, suggesting an abrupt modification of the ice composition and geometric structure. We interpret this behavior as locations where the pressure-melting point is reached, outlining fields of freezing and melting ice. Basal steps are observed at both SMIS and RIS, suggesting a common geometric expression of widespread basal processes. This technique offers a simultaneous view of both the surface and basal boundary conditions to help investigate the ice-shelf stability, while its application to airborne data significantly improves coverage of the difficult-to-observe ice–ocean boundary. It also provides constraints on thermohaline circulation in ice shelves cavities, which are analogs for ice-covered ocean worlds. |
format |
Article in Journal/Newspaper |
author |
C. GRIMA I. KOCH J. S. GREENBAUM K. M. SODERLUND D. D. BLANKENSHIP D. A. YOUNG D. M. SCHROEDER S. FITZSIMONS |
author_facet |
C. GRIMA I. KOCH J. S. GREENBAUM K. M. SODERLUND D. D. BLANKENSHIP D. A. YOUNG D. M. SCHROEDER S. FITZSIMONS |
author_sort |
C. GRIMA |
title |
Surface and basal boundary conditions at the Southern McMurdo and Ross Ice Shelves, Antarctica |
title_short |
Surface and basal boundary conditions at the Southern McMurdo and Ross Ice Shelves, Antarctica |
title_full |
Surface and basal boundary conditions at the Southern McMurdo and Ross Ice Shelves, Antarctica |
title_fullStr |
Surface and basal boundary conditions at the Southern McMurdo and Ross Ice Shelves, Antarctica |
title_full_unstemmed |
Surface and basal boundary conditions at the Southern McMurdo and Ross Ice Shelves, Antarctica |
title_sort |
surface and basal boundary conditions at the southern mcmurdo and ross ice shelves, antarctica |
publisher |
Cambridge University Press |
publishDate |
2019 |
url |
https://doi.org/10.1017/jog.2019.44 https://doaj.org/article/5da463d1217d48f8899a07af8814fa8a |
long_lat |
ENVELOPE(166.500,166.500,-78.000,-78.000) |
geographic |
Ross Ice Shelf McMurdo Ice Shelf |
geographic_facet |
Ross Ice Shelf McMurdo Ice Shelf |
genre |
Antarc* Antarctica Ice Shelf Ice Shelves Journal of Glaciology McMurdo Ice Shelf Ross Ice Shelf |
genre_facet |
Antarc* Antarctica Ice Shelf Ice Shelves Journal of Glaciology McMurdo Ice Shelf Ross Ice Shelf |
op_source |
Journal of Glaciology, Vol 65, Pp 675-688 (2019) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143019000443/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2019.44 0022-1430 1727-5652 https://doaj.org/article/5da463d1217d48f8899a07af8814fa8a |
op_doi |
https://doi.org/10.1017/jog.2019.44 |
container_title |
Journal of Glaciology |
container_volume |
65 |
container_issue |
252 |
container_start_page |
675 |
op_container_end_page |
688 |
_version_ |
1766251080171126784 |