Overview -JKEO Buoy-
On February 18, 2007, at 37- 55.33N, 146- 34.64E (nominal 38.0N, 146.5E,
named as "JAMSTEC Kuroshio Extension Observatory, JKEO" site) in
the north of Kuroshio Extension region, IORGC/JAMSTEC deployed a surface buoy
(JKEO1) under the collaboration in research with PMEL/NOAA. This JKEO1 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 JKEO1 are publicly available in this web site,
and are being utilized for better understanding of air-sea interaction in the
western North Pacific, and validation of satellite data. Both KEO and JKEO
are part of the global network of OceanSITES
time series reference sites.
Locations of JKEO and KEO
buoys. Black contour and color mean SST (deg. C). White contour means
turbulent heat flux (W/m**2). The SST and the turbulent heat flux data are
derived from COADS wintertime climatology during 1960-1997.
has set a CO2 measurement system on JKEO buoy under the collaboration in
research with Mutsu
Institute for Oceanography (MIO) of JAMSTEC. JKEO CO2 data and
metadata are available through the PMEL CO2time series web
JKEO1 buoy was recovered on March 24, 2008, by R/V Mirai. The data retrieved
are publicly available in the data page of this web site in ascii format and
OceanSITES NetCDF format.
On February 29, 2008, IORGC/JAMSTEC deployed another surface buoy named as
JKEO2 at JKEO site (38-04.82' N, 146-25.21' E). JKEO2 buoy is a newly
designed one named as K-TRITON which is based on m-TRITON buoy developed by
of JAMSTEC had set a CO2 measurement system on JKEO2 buoy.
On May 28, JKEO2 stopped transmission of observational data due to loss of
ARGOS antenna, and was recovered on September 5, 2008 during the R/V Kaiyo KY08-09
cruise. The data retrieved are publicly available in the data page of this
web site in ascii format and OceanSITES NetCDF format.
On November 12, 2008, IORGC/JAMSTEC deployed the third surface buoy JKEO3 at
JKEO site (38-04.71' N, 146-25.14' E) during the R/V Mirai MR08-E02 emergency
cruise. The design of JKEO3 buoy is a little modified from JKEO2 buoy for
avoiding damages by fishing activity. MIO of JAMSTEC had
set a CO2 measurement system on JKEO3 buoy. Trouble in data transmission
system was found in the early morning of November 13, and its top buoy was
put on deck and re-deployed on November 15 after repair of the data
On August 28, 2009, JKEO3 was recovered. The data retrieved are publicly
available in the data page of this web site in ascii format and OceanSITES
On August 29, 2009, JAMSTEC deployed the fourth surface buoy JKEO4 at JKEO
site (38-04.71' N, 146-25.76' E) during the R/V Kaiyo KY09-07 cruise. The
design of JKEO4 buoy is a little modified from JKEO3 buoy with adding weather
sensor and GPS wave-height meter. MIO of JAMSTEC had
set a CO2 measurement system on JKEO4 buoy.
On October 8, 2010, JKEO4 drifted. The top buoy including the data logger
system was recovered on October 12, 2010. The most of subsurface sensors were
recovered on February 22, 2011. The data retrieved are publicly available in
the data page of this web site in ascii format and OceanSITES NetCDF format.
On February 23, 2011, JAMSTEC deployed the fifth surface buoy JKEO5 at JKEO
site (38-05.06' N, 146-26.87' E) during the R/V Mirai MR11-02 cruise. The
detail of JKEO5 mooring is available in the Technical Info page of this web
On June 23, 2012, JKEO5 was recovered. The meteorological data until August
19, 2012, retrieved from the data logger are publicly available in the data
page of this web site in ascii format and in OceanSITES NetCDF format. The
oceanic data until June 22, 2012, retrieved from the instruments are publicly
available in the data page of this web site in ascii and OceanSITES NetCDF
On June 19, 2012, JAMSTEC deployed the sixth surface buoy JKEO6 at JKEO site
(37-54.07' N, 146-36.54' E, 5380 m) during the R/V Mirai MR12-02 cruise. The
detail of mooring is available in the Technical Information page of this web
The transmition of all data has been stopped since August 14. The data
transmitted from JKEO6 until 14 August are available now in the data page of
this web site.
JKEO6 buoy is scheduled to be recovered in July 2013.
JKEO is operated by
Ocean-Atmosphere Interaction Research Team,
Ocean Climate Change Research Program,
Research Institute for Global Change,
Japan Agency for Marine-Earth Science and Technology
Contact and PI:
Dr. Yoshimi Kawai,
Cronin, M. F., C. Meinig, C. L. Sabine, H. Ichikawa, and H. Tomita:
Surface Mooring Network in the Kuroshio Extension. IEEE Systems Journal,
Vol.2, No.3, 424-430,doi:10.1109/JSYST.2008.925982, (Published on September
Tomita, H., M. Kubota, M. F. Cronin, S. Iwasaki, M. Konda and H. Ichikawa
(2010): An assessment of surface heat fluxes from J-OFURO2 at the KEO and
JKEO sites, J. Geophys. Res. -Oceans, 115, C03018, 10.1029/2009jc005545.
Konda, M., H. Ichikawa, H. Tomita and M. F. Cronin (2010): Surface Heat Flux
Variations across the Kuroshio Extension as Observed by Surface Flux Buoys,
J. Climate, 23, 5206-5221.
Last update on February 19, 2013.