1. INSPIRE Environmental, Newport, Rhode Island 02840, United States
2. Division of Marine Science and Conservation, Nicholas School of the Environment, Duke University, Beaufort, North Carolina 28516, United States
3. Exa Data and Mapping, Poulsbo, Washington 98370, United States
4. Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton SO14 3ZH, U.K.