This material is based upon work supported by the Department of Energy under grant number DE-FG02-09ER64727, the Environmental Protection Agency under contract number EP09H000821, the Food and Drug Administration under contract number HHSF22301002T, the Marine Mammal Commission under contract number E4047467, the Minerals Management Service under contract number M09PX00075, the National Aeronautics and Space Administration under grant number NNX09AI86G, the National Institute of Environmental Health Sciences under contract number HHSN273200900082P, the National Oceanic and Atmospheric Administration under contract number DG133R08CQ0062, the National Science Foundation under grant number OCE-0910762, the United States Arctic Research Commission, and the United States Geological Survey under grant number G09AP00034"--T.p. verso.