1. Aoki Y, Suga T, Hanawa K (2002) Subsurface subtropical fronts of the North Pacific as inherent boundaries in the ventilated thermocline. J Phys Oceanogr 32:2299–2311
2. Argo Science Team (2001) Argo: the global array of profiling floats. In: Koblinsky CJ, Smith NR (eds) Observing the oceans in the 21st century. GODAE Project Office, Bureau of Meteorology, Melbourne, pp 248–258
3. Boyer TP, Stephens C, Antonov JI, Conkright ME, Locarnini RA, O’Brien TD, Garcia HE (2002) World ocean atlas 2001. Salinity, vol 1. In: Levitus S (ed) NOAA atlas NESDIS 50. US Government Printing Office, Washington, DC, p 176
4. Hanawa K, Talley L (2001) Mode waters, in ocean circulation and climate. In: Siedler G, Church J, Gould J (eds) Int Geophys Ser. Elsevier, New York, pp 373–386
5. Hosoda S, Ohira T, Sato K, Suga T (2010) Improved description of global mixed-layer depth using Argo profiling floats. J Oceanogr 66:773–787