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Sea ice concentrations in the Weddell Sea: A comparison of SSM/I, ULS, and GCM data
Author(s) -
Connolley W. M.
Publication year - 2005
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2004gl021898
Subject(s) - sea ice , arctic ice pack , special sensor microwave/imager , environmental science , arctic , climatology , sea ice concentration , oceanography , geology , satellite , sea ice thickness , atmospheric sciences , microwave , physics , quantum mechanics , aerospace engineering , brightness temperature , engineering
The sea ice fraction in the interior of the pack, especially in winter, is important for climate studies and for validation of sea ice models. When ice concentration is high, a difference of only a few percent in ice fraction can have a major effect on the ocean‐air fluxes. Satellite estimates of the ice fraction in the Antarctic winter based on microwave emissions are typically 90–95%, with values from the “Bootstrap” algorithm higher than the “NASA team”. However coupled ocean‐atmosphere models usually show higher concentrations. A recent evaluation for the Arctic has shown that the true winter ice fractions can be very high, above 99%. Upward looking sonar data from the Weddell Sea is used to show that Antarctic concentrations are higher than previously estimated, and to reevaluate climate model results in this light. The bootstrap algorithm is found to provide a better fit to the sonar data.