1. Polar Science Center, Applied Physics LaboratoryUniversity of WashingtonSeattle Washington USA
2. U.S. ArmyCold Regions Research and Engineering LaboratoryHanover New Hampshire USA
3. School of OceanographyUniversity of WashingtonSeattle Washington USA
4. Department of Atmospheric SciencesUniversity of WashingtonSeattle Washington USA
5. Now at Antarctic Research Centre, Victoria University of WellingtonWellington New Zealand