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Comparison of sea ice algorithms
Sea Ice Area and Extent obtained from algorithms: Norsex, NASA Team, Bootstrap, ASI, Bristol, Swift, CalVal and TUD
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Sea Ice Area and Extent were calculated using Near-Real-Time DMSP SSM/I Daily Polar Gridded Brightness Temperatures, obtained from National Snow and Ice Data Center (NSIDC) ftp server [Cavalieri et al 1999]. The algorithms were implemented on the basis of their descriptions: Norsex [Svendsen et al 1983], NASA Team [Cavalieri and Gloersen 1984], Bootstrap [Comiso 1995], ASI [Svendsen et al 1987, Spreen et al 2008], Swift [Swift et al 1985]. Bristol [Smith and Barrett 1994], TUD [Pedersen 1998] and CalVal [Tonboe, personal communication] algorithms were provided by Rasmus T. Tonboe, Center for Ocean&Ice, Danish Meteorological Institute. These sources were chosen as main but the algorithms updates were taken from NSIDC web page for NASA Team and Bootstrap, from personal communication at Nansen Environmental and Remote Sensing Center (NERSC) for Norsex and from Institute of Environmental Physics (IUP-Bremen), University of Bremen web page for ASI. The quality control of the calculations was fulfilled by comparison with original data from NSIDC, NERSC and IUP-Bremen. Some differences occur between the originals and reproduced algorithms and are presumably caused by different data processing routines used in the institutions. However, this control was not made for Bristol, Swift, CalVal and TUD cases, because the original data for sea ice area and extent were not found yet. In the algorithms, using 85 GHz channel, data from 91 GHz channel were used instead.
References
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