High resolution observations of Weddell Sea surface currents using ERS-l SAR sea-ice motion vectors
Abstract Two areas of the Weddell Sea, one in the south and one in the west, were chosen for a preliminary investigation of sea-ice motion tracking from ERSt Synthetic Aperture Radar (SAR) images during the Austral summer. Only a small number of images were processed, so a manual tracking method was...
Published in: | International Journal of Remote Sensing |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Taylor and Francis
1995
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/515860/ https://doi.org/10.1080/01431169508954637 |
id |
ftnerc:oai:nora.nerc.ac.uk:515860 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:515860 2023-05-15T13:49:33+02:00 High resolution observations of Weddell Sea surface currents using ERS-l SAR sea-ice motion vectors Thomas, J. P. Turner, J. Lachlan-Cope, T.A. Corcoran, G. 1995 http://nora.nerc.ac.uk/id/eprint/515860/ https://doi.org/10.1080/01431169508954637 unknown Taylor and Francis Thomas, J. P.; Turner, J. orcid:0000-0002-6111-5122 Lachlan-Cope, T.A. orcid:0000-0002-0657-3235 Corcoran, G. 1995 High resolution observations of Weddell Sea surface currents using ERS-l SAR sea-ice motion vectors. International Journal of Remote Sensing, 16 (17). 3409-3425. https://doi.org/10.1080/01431169508954637 <https://doi.org/10.1080/01431169508954637> Publication - Article PeerReviewed 1995 ftnerc https://doi.org/10.1080/01431169508954637 2023-02-04T19:44:17Z Abstract Two areas of the Weddell Sea, one in the south and one in the west, were chosen for a preliminary investigation of sea-ice motion tracking from ERSt Synthetic Aperture Radar (SAR) images during the Austral summer. Only a small number of images were processed, so a manual tracking method was used. In the 3–day period between SAR images the atmosphere warmed near the surface, which led to significant changes in radar backscatter from, and thus in contrast between, ice floes and the areas between them. It was therefore not always possible to track features from one image to the next. The tracked features were clearly identified in images which were sub-sampled at onesixteenth of the full resolution available. In the southern Weddell Sea images, many large floes were present which allowed a quite detailed pattern of the surface water circulation to be mapped as the ice motion was predominantly forced by the ocean currents during a period of low surface wind speeds. The observed circulation pattern agreed well with previous observations from hydrographic surveys in this area north of the Filchner Ice Shelf. In the western Weddell Sea images good tracers were hard to find, but it was still possible to detect the edge of the western boundary current of the Weddell Gyre. Continuous monitoring of sea-ice motion in these two areas using SAR imagery could be a useful means of detecting changes in surface water flow which may be linked to the rate of formation of Antarctic bottom water. Article in Journal/Newspaper Antarc* Antarctic Ice Shelf Sea ice Weddell Sea Natural Environment Research Council: NERC Open Research Archive Antarctic Weddell Sea Austral Weddell Filchner Ice Shelf ENVELOPE(-40.000,-40.000,-79.000,-79.000) International Journal of Remote Sensing 16 17 3409 3425 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
Abstract Two areas of the Weddell Sea, one in the south and one in the west, were chosen for a preliminary investigation of sea-ice motion tracking from ERSt Synthetic Aperture Radar (SAR) images during the Austral summer. Only a small number of images were processed, so a manual tracking method was used. In the 3–day period between SAR images the atmosphere warmed near the surface, which led to significant changes in radar backscatter from, and thus in contrast between, ice floes and the areas between them. It was therefore not always possible to track features from one image to the next. The tracked features were clearly identified in images which were sub-sampled at onesixteenth of the full resolution available. In the southern Weddell Sea images, many large floes were present which allowed a quite detailed pattern of the surface water circulation to be mapped as the ice motion was predominantly forced by the ocean currents during a period of low surface wind speeds. The observed circulation pattern agreed well with previous observations from hydrographic surveys in this area north of the Filchner Ice Shelf. In the western Weddell Sea images good tracers were hard to find, but it was still possible to detect the edge of the western boundary current of the Weddell Gyre. Continuous monitoring of sea-ice motion in these two areas using SAR imagery could be a useful means of detecting changes in surface water flow which may be linked to the rate of formation of Antarctic bottom water. |
format |
Article in Journal/Newspaper |
author |
Thomas, J. P. Turner, J. Lachlan-Cope, T.A. Corcoran, G. |
spellingShingle |
Thomas, J. P. Turner, J. Lachlan-Cope, T.A. Corcoran, G. High resolution observations of Weddell Sea surface currents using ERS-l SAR sea-ice motion vectors |
author_facet |
Thomas, J. P. Turner, J. Lachlan-Cope, T.A. Corcoran, G. |
author_sort |
Thomas, J. P. |
title |
High resolution observations of Weddell Sea surface currents using ERS-l SAR sea-ice motion vectors |
title_short |
High resolution observations of Weddell Sea surface currents using ERS-l SAR sea-ice motion vectors |
title_full |
High resolution observations of Weddell Sea surface currents using ERS-l SAR sea-ice motion vectors |
title_fullStr |
High resolution observations of Weddell Sea surface currents using ERS-l SAR sea-ice motion vectors |
title_full_unstemmed |
High resolution observations of Weddell Sea surface currents using ERS-l SAR sea-ice motion vectors |
title_sort |
high resolution observations of weddell sea surface currents using ers-l sar sea-ice motion vectors |
publisher |
Taylor and Francis |
publishDate |
1995 |
url |
http://nora.nerc.ac.uk/id/eprint/515860/ https://doi.org/10.1080/01431169508954637 |
long_lat |
ENVELOPE(-40.000,-40.000,-79.000,-79.000) |
geographic |
Antarctic Weddell Sea Austral Weddell Filchner Ice Shelf |
geographic_facet |
Antarctic Weddell Sea Austral Weddell Filchner Ice Shelf |
genre |
Antarc* Antarctic Ice Shelf Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctic Ice Shelf Sea ice Weddell Sea |
op_relation |
Thomas, J. P.; Turner, J. orcid:0000-0002-6111-5122 Lachlan-Cope, T.A. orcid:0000-0002-0657-3235 Corcoran, G. 1995 High resolution observations of Weddell Sea surface currents using ERS-l SAR sea-ice motion vectors. International Journal of Remote Sensing, 16 (17). 3409-3425. https://doi.org/10.1080/01431169508954637 <https://doi.org/10.1080/01431169508954637> |
op_doi |
https://doi.org/10.1080/01431169508954637 |
container_title |
International Journal of Remote Sensing |
container_volume |
16 |
container_issue |
17 |
container_start_page |
3409 |
op_container_end_page |
3425 |
_version_ |
1766251630972370944 |