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| Titel |
An algorithm to detect sea ice leads by using AMSR-E passive microwave imagery |
| VerfasserIn |
J. Röhrs, L. Kaleschke |
| 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 ; 6, no. 2 ; Nr. 6, no. 2 (2012-03-27), S.343-352 |
| Datensatznummer |
250003482
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| Publikation (Nr.) |
 copernicus.org/tc-6-343-2012.pdf |
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| Zusammenfassung |
| Leads are major sites of energy fluxes and brine releases at the air-ocean
interface of sea-ice covered oceans. This study presents an algorithm to
detect leads wider than 3 km in the entire Arctic Ocean.
The algorithm detects 50 % of the lead area that was visible in optical
MODIS satellite images. Passive microwave imagery from the Advanced Microwave
Scanning Radiometer – Earth Observation System (AMSR-E) is used, allowing
daily observations due to the fact that AMSR-E does not depend on daylight or cloud conditions.
Using the unique signatures of thin ice in the brightness temperature ratio
between the 89 GHz and 19 GHz channels, the algorithm is able
to detect thin ice areas in the ice cover and is optimized to detect
leads. Leads are mapped for the period from 2002 to 2011 excluding the
summer months, and validated qualitatively by using MODIS, Envisat ASAR,
and CryoSat-2 data.
Several frequently recurring large scale lead patterns are
found, especially in regions where sea ice is known to drift out of the
Arctic Ocean. |
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