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| Titel |
Long-term coastal-polynya dynamics in the southern Weddell Sea from MODIS thermal-infrared imagery |
| VerfasserIn |
S. Paul, S. Willmes, G. Heinemann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 9, no. 6 ; Nr. 9, no. 6 (2015-11-09), S.2027-2041 |
| Datensatznummer |
250116864
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| Publikation (Nr.) |
 copernicus.org/tc-9-2027-2015.pdf |
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| Zusammenfassung |
| Based upon thermal-infrared satellite imagery in combination with ERA-Interim
atmospheric reanalysis data, we derive long-term polynya characteristics such as
polynya area, thin-ice thickness distribution, and ice-production rates for a
13-year investigation period (2002–2014) for the austral winter
(1 April to 30 September) in the Antarctic southern Weddell Sea. All polynya
parameters are derived from daily cloud-cover corrected thin-ice thickness composites.
The focus lies on coastal polynyas which are important hot spots for new-ice formation,
bottom-water formation, and heat/moisture release into the atmosphere. MODIS
has the capability to resolve even very narrow coastal polynyas. Its major
disadvantage is the sensor limitation due to cloud cover. We make use of a
newly developed and adapted spatial feature reconstruction scheme to account
for cloud-covered areas. We find the sea-ice areas in front of the Ronne and
Brunt ice shelves to be the most active with an annual average polynya area of
3018 ± 1298 and 3516 ± 1420 km2 as well as an accumulated
volume ice production of 31 ± 13 and 31 ± 12 km3,
respectively. For the remaining four regions, estimates amount to
421 ± 294 km2 and 4 ± 3 km3 (Antarctic Peninsula),
1148 ± 432 km2 and 12 ± 5 km3 (iceberg A23A),
901 ± 703 km2 and 10 ± 8 km3 (Filchner Ice Shelf), as
well as 499 ± 277 km2 and 5 ± 2 km3 (Coats Land). Our
findings are discussed in comparison to recent studies based on coupled
sea-ice/ocean models and passive-microwave satellite imagery, each
investigating different parts of the southern Weddell Sea. |
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