1. Naval Research Lab, Oceanography Division, Code 7320, Stennis Space Center, MS 39529 (corresponding author).
2. Naval Research Lab, Oceanography Division, Code 7320, Stennis Space Center, MS 39529.
3. Dept. of Marine Science, Univ. of Georgia, Athens, GA 30602.
4. Dept. of Marine and Environmental Systems, Florida Institute of Technology, Melbourne, FL 32901.