On February 18, 2007, IORGC/JAMSTEC deployed a surface buoy named as "JAMSTEC Kuroshio Extension Observatory (JKEO)" at 37- 55.33N, 146- 34.64E (nominal 38.0N, 146.5E) in the north of Kuroshio Extension region, under the collaboration in research with PMEL/NOAA. JKEO buoy is based on KEO buoy of NOAA/PMEL and carries same sensors as KEO to monitor heat, moisture and momentum fluxes, and upper ocean temperature and salinity. Those flux and ocean observation data from JKEO are publicly available.