The Terra Nova Bay (Antarctica) polynya observed by MODIS ice surface temperature imagery from May to June 2009
We have examined the development of the Terra Nova Bay polynya (TNBP) using a two-month sequence of Moderate Resolution Imaging Spectroradiometer (MODIS) ice surface temperature (IST) images, complemented by a set of synthetic aperture radar (SAR) images. Results of a comparison between the clear-sk...
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ftuninapoliparth:oai:ricerca.uniparthenope.it:11367/19950 2024-04-21T07:50:26+00:00 The Terra Nova Bay (Antarctica) polynya observed by MODIS ice surface temperature imagery from May to June 2009 CIAPPA Achille BUDILLON, Giorgio Ciappa, Achille Budillon, Giorgio 2012 http://hdl.handle.net/11367/19950 https://doi.org/10.1080/01431161.2011.652314 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000302168900015 volume:33 issue:14 firstpage:4567 lastpage:4582 numberofpages:16 journal:INTERNATIONAL JOURNAL OF REMOTE SENSING http://hdl.handle.net/11367/19950 doi:10.1080/01431161.2011.652314 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84857013206 ://dx.doi.org/10.1080/01431161.2011.652314 Remote Sensing Polynya MODIS info:eu-repo/semantics/article 2012 ftuninapoliparth https://doi.org/10.1080/01431161.2011.652314 2024-03-28T01:11:47Z We have examined the development of the Terra Nova Bay polynya (TNBP) using a two-month sequence of Moderate Resolution Imaging Spectroradiometer (MODIS) ice surface temperature (IST) images, complemented by a set of synthetic aperture radar (SAR) images. Results of a comparison between the clear-sky ISTs and the contemporaneous SAR images revealed that the polynya is characterized in the ISTs by a warm core and in the SARs by a bright backscattering area, due to the presence of seawater and grease ice. The activity of the polynya during the period was highly dynamic, with opening and closing phases that had similar temporal length scales, sometimes of less than 24 h. The recent activity of the polynya is evidenced in the SARs by alternate bright and dark backscatter bands formed during openings and calm periods and transported offshore by the ice drift. The thermal fronts that separate the warm core of the polynya from the surrounding ice sheet appeared sharp during the opening phase and smooth during the closing phase. The spatial resolution of 1 km of MODIS ISTs, compared with space-borne passive microwave systems with maximum resolution of approximately 10 km, provides a smaller area for the TNBP than do passive microwave data. The polynya area was detectable up to 80% of time with a revisit time of a few hours, giving an average area of ¡«1300 km2 and peaks up to 3000 km2. The polynya is forced by katabatic winds that have a warm signature, which is also visible in the IST sequence. Katabatic airflows descending from the Reeves Glacier valley contribute to the opening of the polynya in the central part of the bay, while airflows descending from the surrounding glacier valleys contribute to the opening in the north and south of the bay. Article in Journal/Newspaper Antarc* Antarctica Ice Sheet Università degli Studi di Napoli "Parthenope": CINECA IRIS International Journal of Remote Sensing 33 14 4567 4582 |
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Open Polar |
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Università degli Studi di Napoli "Parthenope": CINECA IRIS |
op_collection_id |
ftuninapoliparth |
language |
English |
topic |
Remote Sensing Polynya MODIS |
spellingShingle |
Remote Sensing Polynya MODIS CIAPPA Achille BUDILLON, Giorgio The Terra Nova Bay (Antarctica) polynya observed by MODIS ice surface temperature imagery from May to June 2009 |
topic_facet |
Remote Sensing Polynya MODIS |
description |
We have examined the development of the Terra Nova Bay polynya (TNBP) using a two-month sequence of Moderate Resolution Imaging Spectroradiometer (MODIS) ice surface temperature (IST) images, complemented by a set of synthetic aperture radar (SAR) images. Results of a comparison between the clear-sky ISTs and the contemporaneous SAR images revealed that the polynya is characterized in the ISTs by a warm core and in the SARs by a bright backscattering area, due to the presence of seawater and grease ice. The activity of the polynya during the period was highly dynamic, with opening and closing phases that had similar temporal length scales, sometimes of less than 24 h. The recent activity of the polynya is evidenced in the SARs by alternate bright and dark backscatter bands formed during openings and calm periods and transported offshore by the ice drift. The thermal fronts that separate the warm core of the polynya from the surrounding ice sheet appeared sharp during the opening phase and smooth during the closing phase. The spatial resolution of 1 km of MODIS ISTs, compared with space-borne passive microwave systems with maximum resolution of approximately 10 km, provides a smaller area for the TNBP than do passive microwave data. The polynya area was detectable up to 80% of time with a revisit time of a few hours, giving an average area of ¡«1300 km2 and peaks up to 3000 km2. The polynya is forced by katabatic winds that have a warm signature, which is also visible in the IST sequence. Katabatic airflows descending from the Reeves Glacier valley contribute to the opening of the polynya in the central part of the bay, while airflows descending from the surrounding glacier valleys contribute to the opening in the north and south of the bay. |
author2 |
Ciappa, Achille Budillon, Giorgio |
format |
Article in Journal/Newspaper |
author |
CIAPPA Achille BUDILLON, Giorgio |
author_facet |
CIAPPA Achille BUDILLON, Giorgio |
author_sort |
CIAPPA Achille |
title |
The Terra Nova Bay (Antarctica) polynya observed by MODIS ice surface temperature imagery from May to June 2009 |
title_short |
The Terra Nova Bay (Antarctica) polynya observed by MODIS ice surface temperature imagery from May to June 2009 |
title_full |
The Terra Nova Bay (Antarctica) polynya observed by MODIS ice surface temperature imagery from May to June 2009 |
title_fullStr |
The Terra Nova Bay (Antarctica) polynya observed by MODIS ice surface temperature imagery from May to June 2009 |
title_full_unstemmed |
The Terra Nova Bay (Antarctica) polynya observed by MODIS ice surface temperature imagery from May to June 2009 |
title_sort |
terra nova bay (antarctica) polynya observed by modis ice surface temperature imagery from may to june 2009 |
publishDate |
2012 |
url |
http://hdl.handle.net/11367/19950 https://doi.org/10.1080/01431161.2011.652314 |
genre |
Antarc* Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctica Ice Sheet |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000302168900015 volume:33 issue:14 firstpage:4567 lastpage:4582 numberofpages:16 journal:INTERNATIONAL JOURNAL OF REMOTE SENSING http://hdl.handle.net/11367/19950 doi:10.1080/01431161.2011.652314 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84857013206 ://dx.doi.org/10.1080/01431161.2011.652314 |
op_doi |
https://doi.org/10.1080/01431161.2011.652314 |
container_title |
International Journal of Remote Sensing |
container_volume |
33 |
container_issue |
14 |
container_start_page |
4567 |
op_container_end_page |
4582 |
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