Physics
Scientific paper
Feb 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3503805l&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 3, CiteID L03805
Physics
12
Atmospheric Processes: Polar Meteorology, Cryosphere: Leads (4540), Cryosphere: Sea Ice (4540), Cryosphere: Energy Balance, Oceanography: Physical: Turbulence, Diffusion, And Mixing Processes (4490)
Scientific paper
The maximum effect of open leads within sea ice on the near-surface atmospheric temperature is estimated using a 1D atmospheric model coupled with a thermodynamic snow/sea ice model. The study is restricted to clear-sky conditions during polar night. The model is initialized with a typical wintertime atmospheric temperature profile. Results are analyzed at different integration times corresponding to different fetches over the fractured sea ice as a function of wind speed and sea ice concentration A. The results demonstrate that for A > 90% small changes in the sea ice fraction have a strong effect on the near-surface temperature. A change by 1% causes a temperature signal of up to 3.5 K. A threshold value of about 4 m s-1 for the 10-m wind speed divides the air-ice interaction process into a weak-wind and strong-wind regime.
Birnbaum George
Lüpkes C.
Vihma Timo
Wacker U.
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