HR: 0800h
AN: C41C-0214    [Abstracts]
TI: Heat Flux Comparison Using Buoy- and SAR-derived Motion Products From ISW 1992
AU: * Geiger, C A
EM: cathleen.a.geiger@erdc.usace.army.mil
AF: Cold Regions Research and Engineering Laboratory, 72 Lyme Road, Hanover, NH 03755 United States
AU: Drinkwater, M R
EM: Mark.Drinkwater@esa.int
AF: European Space Agency, ESTEC Earth Observation Programmes, Postbus 299, Noordwijk, 2200 AG Netherlands
AB: Sea-ice kinematics relevant to surface fluxes using ERS-1 SAR images coincident with buoys in the western Weddell Sea in Austral Autumn of 1992 is examined. Using a toy model, effects of aliasing in surface flux determination are tested. Results show variability associated with storms, ocean tides, inertial oscillations, and other high frequency forcing affects integrated sea-ice growth rates along this shelf/slope location. Integrated salt and new ice production rates computed from buoys are found to be two times larger than those using ERS-1 SAR motion products. Cognizant of the limitations in satellite image pairs separated by time, we report on differences in salt and ice production rates, it follows directly that the differences in salt and ice production rates result primarily from inadequate temporal resolution of shorter than daily (sub-daily) heat flux variability and sea-ice divergence. Comparison with other studies shows the problem is widespread thereby impacting the modeling of sea-ice mass balance and variability. These small-scale processes have significant ramifications to larger scales and the global thermohaline circulation.
DE: 9310 Antarctica
DE: 4227 Diurnal, seasonal, and annual cycles
DE: 4540 Ice mechanics and air/sea/ice exchange processes
DE: 4560 Surface waves and tides (1255)
DE: 4594 Instruments and techniques
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting