J1.15 PARAMETERIZING THE TURBULENT SURFACE FLUXES OVER SUMMER SEA ICE

The experiment to study the Surface Heat Budget of the Arctic Ocean (SHEBA) lasted for a year (Uttal et al. 2002). Our Atmospheric Surface Flux Group (ASFG) measured the momentum flux and the turbulent and radiative components of the surface heat budget for that year at several sites around the SHEBA ice camp (Andreas et al. 1999; Persson et al. 2002) with one goal being to develop a bulk flux algorithm for turbulent exchange over sea ice. Based on aerodynamic considerations, Andreas et al. (2003) divided the SHEBA year, which ran from 2 October 1997 to 11 October 1998, into two seasons: winter and summer. Winter lasted from the beginning of our data collecting in early November 1997 through 14 May 1998, resumed on 15 September 1998, and ran until the end of our data record in late September. Summer was the intervening period, 15 May through 14 September 1998. In winter, snow was available to drift and blow and, therefore, to affect the turbulent air-ice coupling. In summer, the snow was too sticky to drift and, by July, had disappeared entirely. Andreas et al. (2004a, 2004b, 2005) describe our turbulent flux algorithm for winter sea ice, when snow is an important agent in the exchange processes. Here we discuss our progress in developing a bulk flux algorithm for summer sea ice. Although the summer sea ice during SHEBA evolved slowly, open water and a visibly hetero-