Comparison of sea ice algorithms

Sea Ice Area and Extent obtained from algorithms:  Norsex, NASA Team, UMass-AES, Bootstrap, Cal Val, Bristol, TUD and ASI

Sea ice area and extent were calculated using Near-Real-Time DMSP SSM/I-SSMIS 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 et al. 1984], UMass-AES [Swift et al. 1985], TUD [Pedersen 1998] and ASI [Kaleschke et al. 2001]. To implement algorithms Bootstrap [Comiso 1986, 1995], Bristol [Smith and Barrett 1994] and CalVal [Ramseier 1991] codes from Leif Toudal Pedersen and Rasmus T. Tonboe, Danish Meteorological Institute, were used.  Some differences occur between the originals and reproduced algorithms and are presumably caused by different data processing routines used in the institutions. In the 85 GHz channel algorithms 91 GHz channel data were used.

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