Paul Thomson (Australian National Facility for Ocean Gliders, School of Civil, Environmental and Mining Engineering and The UWA Oceans Institute, The University of Western Australia, 35 Stirling Highway, Perth WA 6007, Australia), Alessandra Mantovanelli (Australian National Facility for Ocean Gliders, School of Civil, Environmental and Mining Engineering and The UWA Oceans Institute, The University of Western Australia, 35 Stirling Highway, Perth WA 6007, Australia), Simon Wright (Australian Antarctic Division, 203 Channel Hwy, Kingston, Tasmania 7050, Australia), Chari Pattiaratchi (Australian National Facility for Ocean Gliders, School of Civil, Environmental and Mining Engineering and The UWA Oceans Institute, The University of Western Australia, 35 Stirling Highway, Perth WA 6007, Australia)