JKEO Buoy Web Site


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Overview -JKEO Buoy-

Phase 1:
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.

jkeo-ia.jpg

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.

PMEL/NOAA 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 pages.

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.


Phase 2:
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 MARITEC/JAMSTEC. MIO 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.


Phase 3:
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 transmission system.

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 NetCDF format.

Phase 4:
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.

Phase 5:
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 site.

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 formats.

Phase 6:
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 site. 

JKEO6 was recovered on July 2, 2013, during the R/V Kaiyo KY13-09 cruise. The meteorological and oceanic data until July 2, 2013, retrieved from the data logger are publicly available in the data page of this web site in ascii format and in OceanSITES NetCDF format.


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 (JAMSTEC)


Contact and PI:
Dr. Yoshimi Kawai,
Phone:+81-46-867-9495,
Fax:+81-46-867-9455


Reference
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 17, 2008).

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.


<Note>
On April 1, 2014,
Ocean-Atmosphere Interaction Research Team was reorganized together with Ocean Climate Change Research Program, Research Institute for Global Change.


Last update on April 16, 2014.

 


HOME/Overview | Technical Info | Data


Ocean-Atmosphere Interaction Research Team,
Ocean Climate Change Research Program,
Research Institute for Global Change

Japan Agency for Marine-Earth Science and Technology (JAMSTEC)

2-15 Natsushima-cho Yokosuka-city,Kanagawa, 237-0061, Japan

JKEO web master
OCCRP
RIGC
JAMSTEC

 

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