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Sensitivity of the Antarctic sea ice to the thermal conductivity of snow
Author(s) -
Fichefet Thierry,
Tartinville Benoît,
Goosse Hugues
Publication year - 2000
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 - 10.1029/1999gl002397
Subject(s) - sea ice , antarctic sea ice , sea ice thickness , geology , snow , heat flux , climatology , cryosphere , ice shelf , zonal and meridional , arctic ice pack , oceanography , heat transfer , geomorphology , physics , thermodynamics
The sensitivity of a global, coarse‐resolution ice‐ocean model to a decrease in the thermal conductivity of the snow overlaying Antarctic sea ice ( k sant ) is investigated. This study was motivated by recent observations made in the eastern sector of the Southern Ocean and in the Bellingshausen, Amundsen, and Ross Seas, which suggest that the value of k sant usually used in large‐scale sea ice models is about a factor two too high. When k sant is reduced by half in our model, the average thickness of the Antarctic ice pack decreases by 10 cm (10%) and the geographical distributions of snow and ice thicknesses become more realistic. A strengthening of the Southern Ocean stratification and a concomitant weakening of the Antarctic Bottom Water meridional overturning are also noticed. This ultimately impacts on the sensible heat flux from the ocean to the ice and thus on the rate of thermodynamic ice growth.