Inferring Tideâ€Induced Ephemeral Grounding in an Iceâ€Shelfâ€Stream System: Rutford Ice Stream, West Antarctica
Antarctic ice shelves play a key role in regulating the rate of ice flow in tributary ice streams. Temporal variations in the associated ice-shelf buttressing stress are observed to impact ice flow in glaciers and ice streams. Ephemeral grounding induced by tides is an important mechanism for modula...
Published in: | Journal of Geophysical Research: Earth Surface |
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American Geophysical Union
2023
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Online Access: | https://doi.org/10.1029/2022jf006789 |
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ftcaltechauth:oai:authors.library.caltech.edu:e9n78-c0970 2024-06-23T07:47:03+00:00 Inferring Tideâ€Induced Ephemeral Grounding in an Iceâ€Shelfâ€Stream System: Rutford Ice Stream, West Antarctica Zhong, Minyan Simons, Mark Minchew, Brent Zhu, Lijun 2023-02 https://doi.org/10.1029/2022jf006789 unknown American Geophysical Union https://zenodo.org/record/6615587#.Yp1DbGDMLao https://github.com/lijun99/cuAmpcor https://github.com/mzzhong/fourDvel2 https://doi.org/10.1029/2022jf006789 oai:authors.library.caltech.edu:e9n78-c0970 eprintid:122191 resolverid:CaltechAUTHORS:20230710-597219500.1 info:eu-repo/semantics/openAccess Other Journal of Geophysical Research. Earth Surface, 128(2), Art. No. e2022JF006789, (2023-02) Earth-Surface Processes Geophysics info:eu-repo/semantics/article 2023 ftcaltechauth https://doi.org/10.1029/2022jf006789 2024-06-12T06:23:13Z Antarctic ice shelves play a key role in regulating the rate of ice flow in tributary ice streams. Temporal variations in the associated ice-shelf buttressing stress are observed to impact ice flow in glaciers and ice streams. Ephemeral grounding induced by tides is an important mechanism for modulating the buttressing stress. Here, we develop an approach to inferring variations in 3-D surface displacements at an ice-shelf-stream system that explicitly accounts for ephemeral grounding. Using a temporally dense nine-month-long synthetic-aperture radar image acquisition campaign collected over Rutford Ice Stream, West Antarctica, by the 4-satellite COSMO-SkyMed constellation, we infer the ephemeral grounding zones and the spatiotemporal variation of the fortnightly ice-flow variability. We find ephemeral grounding zones along the western ice-shelf margin as well as a few prominent ephemeral grounding points in the central trunk and in the vicinity of the grounding zone. Our observations provide evidence for tide-modulated buttressing stress and the temporally asymmetric response of ice-shelf flow to tidal forcing. Long-term oceanic warming and ice-shelf thinning will cause the loss of ephemeral grounding and decrease in ice-shelf buttressing stress. © 2023. American Geophysical Union. The authors thank ASI for their efforts in making the observational campaign at Rutford Ice Stream successful and the SAR data available. M.Z. thanks Andrew F. Thompson and Victor C. Tsai for insightful discussions. B.M. acknowledges NSF-NERC Awards 1853918 and 1739031. The authors thank editor Olga Sergienko, Alexander Robel, and an anonymous reviwer for their comments that help improve the manuscript. Data Availability Statement: The velocity and displacement field components (Zhong et al., 2022) are archived at https://zenodo.org/record/6615587#.Yp1DbGDMLao. Software used to perform feature tracking on SAR images (Zhu et al., 2022) is freely available at https://github.com/lijun99/cuAmpcor. Software used to infer ephemeral ... Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Rutford Ice Stream West Antarctica Caltech Authors (California Institute of Technology) Antarctic Rutford ENVELOPE(-85.300,-85.300,-78.600,-78.600) Rutford Ice Stream ENVELOPE(-80.000,-80.000,-79.167,-79.167) Sergienko ENVELOPE(-29.400,-29.400,-80.633,-80.633) West Antarctica Journal of Geophysical Research: Earth Surface 128 2 |
institution |
Open Polar |
collection |
Caltech Authors (California Institute of Technology) |
op_collection_id |
ftcaltechauth |
language |
unknown |
topic |
Earth-Surface Processes Geophysics |
spellingShingle |
Earth-Surface Processes Geophysics Zhong, Minyan Simons, Mark Minchew, Brent Zhu, Lijun Inferring Tideâ€Induced Ephemeral Grounding in an Iceâ€Shelfâ€Stream System: Rutford Ice Stream, West Antarctica |
topic_facet |
Earth-Surface Processes Geophysics |
description |
Antarctic ice shelves play a key role in regulating the rate of ice flow in tributary ice streams. Temporal variations in the associated ice-shelf buttressing stress are observed to impact ice flow in glaciers and ice streams. Ephemeral grounding induced by tides is an important mechanism for modulating the buttressing stress. Here, we develop an approach to inferring variations in 3-D surface displacements at an ice-shelf-stream system that explicitly accounts for ephemeral grounding. Using a temporally dense nine-month-long synthetic-aperture radar image acquisition campaign collected over Rutford Ice Stream, West Antarctica, by the 4-satellite COSMO-SkyMed constellation, we infer the ephemeral grounding zones and the spatiotemporal variation of the fortnightly ice-flow variability. We find ephemeral grounding zones along the western ice-shelf margin as well as a few prominent ephemeral grounding points in the central trunk and in the vicinity of the grounding zone. Our observations provide evidence for tide-modulated buttressing stress and the temporally asymmetric response of ice-shelf flow to tidal forcing. Long-term oceanic warming and ice-shelf thinning will cause the loss of ephemeral grounding and decrease in ice-shelf buttressing stress. © 2023. American Geophysical Union. The authors thank ASI for their efforts in making the observational campaign at Rutford Ice Stream successful and the SAR data available. M.Z. thanks Andrew F. Thompson and Victor C. Tsai for insightful discussions. B.M. acknowledges NSF-NERC Awards 1853918 and 1739031. The authors thank editor Olga Sergienko, Alexander Robel, and an anonymous reviwer for their comments that help improve the manuscript. Data Availability Statement: The velocity and displacement field components (Zhong et al., 2022) are archived at https://zenodo.org/record/6615587#.Yp1DbGDMLao. Software used to perform feature tracking on SAR images (Zhu et al., 2022) is freely available at https://github.com/lijun99/cuAmpcor. Software used to infer ephemeral ... |
format |
Article in Journal/Newspaper |
author |
Zhong, Minyan Simons, Mark Minchew, Brent Zhu, Lijun |
author_facet |
Zhong, Minyan Simons, Mark Minchew, Brent Zhu, Lijun |
author_sort |
Zhong, Minyan |
title |
Inferring Tideâ€Induced Ephemeral Grounding in an Iceâ€Shelfâ€Stream System: Rutford Ice Stream, West Antarctica |
title_short |
Inferring Tideâ€Induced Ephemeral Grounding in an Iceâ€Shelfâ€Stream System: Rutford Ice Stream, West Antarctica |
title_full |
Inferring Tideâ€Induced Ephemeral Grounding in an Iceâ€Shelfâ€Stream System: Rutford Ice Stream, West Antarctica |
title_fullStr |
Inferring Tideâ€Induced Ephemeral Grounding in an Iceâ€Shelfâ€Stream System: Rutford Ice Stream, West Antarctica |
title_full_unstemmed |
Inferring Tideâ€Induced Ephemeral Grounding in an Iceâ€Shelfâ€Stream System: Rutford Ice Stream, West Antarctica |
title_sort |
inferring tideâ€induced ephemeral grounding in an iceâ€shelfâ€stream system: rutford ice stream, west antarctica |
publisher |
American Geophysical Union |
publishDate |
2023 |
url |
https://doi.org/10.1029/2022jf006789 |
long_lat |
ENVELOPE(-85.300,-85.300,-78.600,-78.600) ENVELOPE(-80.000,-80.000,-79.167,-79.167) ENVELOPE(-29.400,-29.400,-80.633,-80.633) |
geographic |
Antarctic Rutford Rutford Ice Stream Sergienko West Antarctica |
geographic_facet |
Antarctic Rutford Rutford Ice Stream Sergienko West Antarctica |
genre |
Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Rutford Ice Stream West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Ice Shelf Ice Shelves Rutford Ice Stream West Antarctica |
op_source |
Journal of Geophysical Research. Earth Surface, 128(2), Art. No. e2022JF006789, (2023-02) |
op_relation |
https://zenodo.org/record/6615587#.Yp1DbGDMLao https://github.com/lijun99/cuAmpcor https://github.com/mzzhong/fourDvel2 https://doi.org/10.1029/2022jf006789 oai:authors.library.caltech.edu:e9n78-c0970 eprintid:122191 resolverid:CaltechAUTHORS:20230710-597219500.1 |
op_rights |
info:eu-repo/semantics/openAccess Other |
op_doi |
https://doi.org/10.1029/2022jf006789 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
128 |
container_issue |
2 |
_version_ |
1802650514624610304 |