Tim Boyer, National Oceanographic Data Center, Silver Spring, MD, United States; National Centers for Environmental Information, NESDIS/NOAA, Silver Spring, MD, United States, Ricardo A Locarnini, NOAA NODC, Silver Spring, MD, United States, Alexey V Mishonov, Cooperative Institute for Climate and Satellites University of Maryland, College Park, MD, United States and James R Reagan, ESSIC - University of Maryland, Silver Spring, MD, United States