Ocean heat flux in the central Weddell Sea during winter

Seasonal sea ice, which plays a pivotal role in air-sea interaction in the Weddell Sea (a region of large deepwater formation with potential impact on climate), depends critically on heat nux from the deep ocean. During the a ustral winter of 1994, an intensive process-oriented field program named th e Antarctic Zone Flux Experiment measured upper-ocean turbulent fluxes duri ng two short manned ice-drift station experiments near the Maud Rise seamou nt region of the Weddell Sea. Unmanned data buoys left at the site of the f irst manned drift provided a season-long time series of ice motion, mixed l ayer temperature and salinity. plus a (truncated) high-resolution record of temperature within the ice column. Direct turbulence Ru measurements made in the ocean boundary layer during the manned drift stations were extended to the ice-ocean interface with a "mixing length" model and were used to ev aluate parameters in bulk expressions for interfacial stress (a "Rossby sim ilarity" drag law) and ocean-to-ice heat Bur (proportional to the product o f friction velocity and mixed layer temperature elevation above freezing). The Rossby parameters and dimensionless heat transfer coefficient agree clo sely with previous studies from perennial pack ice in the Arctic, despite a large disparity in undersurface roughness. For the manned drifts, ocean he at flux averaged 52 W m(-2) west of Maud Rise and 23 W m(-2) over Maud Rise . Unmanned buoy heat flux averaged 27 W m(-2) over a 76-day drift. Although short-term differences were large, average conductive heat flux in the ice was nearly identical to ocean heat flux over the 44-day ice thermistor rec ord.