Observation of ocean tides below the Filchner and Ronne Ice Shelves, Antarctica, using synthetic aperture radar interferometry: Comparison with tide model predictions
Tides near and under floating glacial ice, such as ice shelves and glacier termini in fjords, can influence heat transport into the subice cavity, mixing of the under-ice water column, and the calving and subsequent drift of icebergs. Free-surface displacement patterns associated with ocean variabil...
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ftcdlib:oai:escholarship.org/ark:/13030/qt77j3h6dm 2023-05-15T13:43:52+02:00 Observation of ocean tides below the Filchner and Ronne Ice Shelves, Antarctica, using synthetic aperture radar interferometry: Comparison with tide model predictions Rignot, E Padman, L MacAyeal, DR Schmeltz, M 19615 - 19630 2000-08-15 application/pdf https://escholarship.org/uc/item/77j3h6dm unknown eScholarship, University of California qt77j3h6dm https://escholarship.org/uc/item/77j3h6dm CC-BY CC-BY Journal of Geophysical Research: Oceans, vol 105, iss C8 Geophysics Oceanography Physical Geography and Environmental Geoscience article 2000 ftcdlib 2020-08-18T09:20:51Z Tides near and under floating glacial ice, such as ice shelves and glacier termini in fjords, can influence heat transport into the subice cavity, mixing of the under-ice water column, and the calving and subsequent drift of icebergs. Free-surface displacement patterns associated with ocean variability below glacial ice can be observed by differencing two synthetic aperture radar (SAR) interferograms, each of which represents the combination of the displacement patterns associated with the time-varying vertical motion and the time-independent lateral ice flow. We present the pattern of net free-surface displacement for the iceberg calving regions of the Ronne and Filchner Ice Shelves in the southern Weddell Sea. By comparing SAR-based displacement fields with ocean tidal models, the free-surface displacement variability for these regions is found to be dominated by ocean tides. The inverse barometer effect, i.e., the ocean's isostatic response to changing atmospheric pressure, also contributes to the observed vertical displacement. The principal value of using SAR interferometry in this manner lies in the very high lateral resolution (tens of meters) obtained over the large region covered by each SAR image. Small features that are not well resolved by tile typical grid spacing of ocean tidal models may contribute to such processes as iceberg calving and cross-frontal ventilation of the ocean cavity under the ice shelf. Copyright 2000 by the American Geophysical Union. Article in Journal/Newspaper Antarc* Antarctica Ice Shelf Ice Shelves Weddell Sea University of California: eScholarship Weddell Weddell Sea |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Geophysics Oceanography Physical Geography and Environmental Geoscience |
spellingShingle |
Geophysics Oceanography Physical Geography and Environmental Geoscience Rignot, E Padman, L MacAyeal, DR Schmeltz, M Observation of ocean tides below the Filchner and Ronne Ice Shelves, Antarctica, using synthetic aperture radar interferometry: Comparison with tide model predictions |
topic_facet |
Geophysics Oceanography Physical Geography and Environmental Geoscience |
description |
Tides near and under floating glacial ice, such as ice shelves and glacier termini in fjords, can influence heat transport into the subice cavity, mixing of the under-ice water column, and the calving and subsequent drift of icebergs. Free-surface displacement patterns associated with ocean variability below glacial ice can be observed by differencing two synthetic aperture radar (SAR) interferograms, each of which represents the combination of the displacement patterns associated with the time-varying vertical motion and the time-independent lateral ice flow. We present the pattern of net free-surface displacement for the iceberg calving regions of the Ronne and Filchner Ice Shelves in the southern Weddell Sea. By comparing SAR-based displacement fields with ocean tidal models, the free-surface displacement variability for these regions is found to be dominated by ocean tides. The inverse barometer effect, i.e., the ocean's isostatic response to changing atmospheric pressure, also contributes to the observed vertical displacement. The principal value of using SAR interferometry in this manner lies in the very high lateral resolution (tens of meters) obtained over the large region covered by each SAR image. Small features that are not well resolved by tile typical grid spacing of ocean tidal models may contribute to such processes as iceberg calving and cross-frontal ventilation of the ocean cavity under the ice shelf. Copyright 2000 by the American Geophysical Union. |
format |
Article in Journal/Newspaper |
author |
Rignot, E Padman, L MacAyeal, DR Schmeltz, M |
author_facet |
Rignot, E Padman, L MacAyeal, DR Schmeltz, M |
author_sort |
Rignot, E |
title |
Observation of ocean tides below the Filchner and Ronne Ice Shelves, Antarctica, using synthetic aperture radar interferometry: Comparison with tide model predictions |
title_short |
Observation of ocean tides below the Filchner and Ronne Ice Shelves, Antarctica, using synthetic aperture radar interferometry: Comparison with tide model predictions |
title_full |
Observation of ocean tides below the Filchner and Ronne Ice Shelves, Antarctica, using synthetic aperture radar interferometry: Comparison with tide model predictions |
title_fullStr |
Observation of ocean tides below the Filchner and Ronne Ice Shelves, Antarctica, using synthetic aperture radar interferometry: Comparison with tide model predictions |
title_full_unstemmed |
Observation of ocean tides below the Filchner and Ronne Ice Shelves, Antarctica, using synthetic aperture radar interferometry: Comparison with tide model predictions |
title_sort |
observation of ocean tides below the filchner and ronne ice shelves, antarctica, using synthetic aperture radar interferometry: comparison with tide model predictions |
publisher |
eScholarship, University of California |
publishDate |
2000 |
url |
https://escholarship.org/uc/item/77j3h6dm |
op_coverage |
19615 - 19630 |
geographic |
Weddell Weddell Sea |
geographic_facet |
Weddell Weddell Sea |
genre |
Antarc* Antarctica Ice Shelf Ice Shelves Weddell Sea |
genre_facet |
Antarc* Antarctica Ice Shelf Ice Shelves Weddell Sea |
op_source |
Journal of Geophysical Research: Oceans, vol 105, iss C8 |
op_relation |
qt77j3h6dm https://escholarship.org/uc/item/77j3h6dm |
op_rights |
CC-BY |
op_rightsnorm |
CC-BY |
_version_ |
1766194510224687104 |