Sea ice leads detection using SARAL/AltiKa altimeter.

Zakharova, Elena, Fleury, S., Guerreiro, K., Willmes, Sascha, Rémy, Frédérique, Heinemann, G. and Kouraev, Alexei (2015) Sea ice leads detection using SARAL/AltiKa altimeter. Marine Geodesy, 38 . pp. 522-533. DOI 10.1080/01490419.2015.1019655.

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Abstract

Sea ice leads play an essential role in ocean-ice-atmosphere exchange, in ocean circulation, geochemistry and in ice dynamics. Their precise detection is crucial for altimetric estimations of sea ice thickness and volume. This study evaluates the performance of the SARAL/AltiKa altimeter to detect leads and to monitor their spatio-temporal dynamics. We show that a pulse peakiness parameter (PP) used to detect leads by Envisat RA-2 and ERS-1,-2 altimeters is not suitable because of saturation of AltiKa return echoes over the leads. The signal saturation results in loss of 6–10% of PP data over sea ice. We propose a different parameter: maximal power of waveform, and define the threshold to discriminate the leads. Our algorithm can be applied from December until May. It detects well the leads of small and medium size: from 200 m to 3–4 km. So, the combination of the high-resolution altimetric estimates with low-resolution thermal infra-red or radiometric lead fraction products could enhance the capability of remote sensing to monitor sea ice fracturing.

Document Type: Article
Keywords: Sea ice
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1080/01490419.2015.1019655
ISSN: 0149-0419
Projects: Transdrift, Laptev Sea System
Date Deposited: 28 Jan 2015 09:10
Last Modified: 23 Feb 2016 10:34
URI: http://oceanrep.geomar.de/id/eprint/26969

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