1. Gulf of Maine Research Institute, 350 Commercial Street, Portland, ME 04101, USA.
2. NOAA Earth System Research Laboratory, Boulder, CO 80305, USA.
3. School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY 11794, USA.
4. Bigelow Laboratory for Ocean Sciences, 60 Bigelow Drive, East Boothbay, ME 04544, USA.
5. School of Marine Sciences, University of Maine, Orono, ME 04469, USA.
6. Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309, USA.