1. Joint Institute for the Study of Atmosphere and Ocean, University of Washington, Seattle, WA 98195, USA
2. Geological Survey of Canada, Ottawa, Ontario, Canada
3. Pacific Marine Environmental Laboratory, National Oceanic and Atmospheric Administration, Seattle, WA 98115, USA
4. Pacific Marine Environmental Laboratory, National Oceanic and Atmospheric Administration, Newport, OR 97365, USA
5. School of Oceanography, University of Washington, Seattle, WA 98195, USA