Background EPSCoR-State/National Laboratory Partnership Grant

1. Large-scale Modeling of Primary Production and Related Dimethylsulfide (DMS) Production in the Sea Ice Environment Simulated Annual Primary Production within Sea Ice (g C m-2) • Background • EPSCoR-State/National Laboratory Partnership Grant • ice ecosystem model implemented in CICE configured with 20m slab • model run for year 1992 • assess large-scale spatial and seasonal variability Clara Deal and Meibing Jin, International Arctic Research Center (IARC), University of Alaska Fairbanks, Fairbanks, Alaska, USA Scott Elliott, Elizabeth Hunke, Mathew Maltrud, and Nicole Jeffery, Los Alamos National Laboratory, Los Alamos, New Mexico, USA Latitude-averaged ice algal biomass (mg Chl m-2) • Broader impacts • modelingbiogeochemical cycling in sea ice, e.g. Hg, bio-particles • inclusion of sea ice microbial loop and trace gas exchange, e.g. CO2 • structure and function of polar marine food web • ice-ice algae-albedo feedback

2. Observations of DMS(P) in sea ice environment Preliminary model results: DMSP Concentration within Sea Ice (micromol DMSP m-2) 1992 5 05 DMS Production in the Sea Ice Environment • sulfur compounds accumulate in bottom ice where ice algal biomass is highest (Uzuka 2003) • ice edge strongest, most consistent predictor of high seawater DMSP (Matrai et al. 2007) • DMSP enriched in lead microlayers (Matrai et al. 2008) See Poster for: DMS Concentration within Sea Ice Seawater DMSP Concentrations • Broader impacts • seawater and ice DMS emissions to the atmosphere • growth of aerosols that play a role in cloud formation and properties