1. a Ocean Sensing and Prediction Division, Naval Oceanographic and Atmospheric Research Laboratory, John C. Stennis Space Center , MS, 39529, U.S.A
2. b Ocean Models Division, Fleet Numerical Oceanography Center , Monterey, CA, 93943, U.S.A
3. c Woods Hole Oceanographic Institution , Woods Hole, MA, 02543, U.S.A