1. US Geological Survey, Alaska Cooperative Fish and Wildlife Research Unit, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
2. Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
3. Marine Biological Laboratory, The Ecosystems Center, Woods Hole, MA 02543, USA
4. Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
5. Geosciences Research Division, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, USA
6. Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, IN 47907, USA
7. Marine Science Institute, University of Texas, Port Aransas, TX 78373, USA