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Diagram of JKEO2, Feb. 2008 - September 2008
Instruments of JKEO2, Feb. 2008 - September 2008

Latitude

Longitude

Deployment date

Recovery date

Water depth

38° 04.82'N

146° 25.21'E

Feb. 29, 2008

September 5, 2008

5407 m

The JKEO2 mooring design is based on the m-TRITON mooring design modified for the harsh conditions in the Kuroshio Extension region.

The JKEO2 mooring is a slack mooring with scope 1.44 because of the severe current regime. The upper portion of the mooring is kept fairly vertical (but less so than taut-line moorings) by using a reverse catenary design. Because the mooring line is larger than the ocean depth, the subsurface pressure data should be used to remap the observations onto nominal depths. With a watch circle radius of approximately 6 km, mariners are asked to keep a safe distance from the mooring.

The surface buoy is a 1.9 m diameter polyurethane-coated polyethylene-foam cylinder with 1.4 m height. It has a stainless pole with three plastic cylindrical cases containing respectively the batteries, data logger, and Argos data telemeter system, together with one plastic cylindrical case containing pCO2 measurement system provided by Mutsu Institute of Oceanography (MIO/JAMSTEC). When completely rigged, the system has an air weight of approximately 1000 kg, a net buoyancy of nearly 3000 kg, and an overall height of 5.5 m. The underwater container cases are approximately 57 cm long and 22 cm diameter. The buoy can be seen on radar from 4-8 miles depending on sea conditions.

10 mm diameter wire rope jacketed to 13 mm is used in the upper 700 meters to guard against damage from fish bite. Fairings are attached at upper 300 m of the wire rope. 12-strand 17 mm diameter nylon lines (500 m x 9 lines) are used for the next 4500m of the mooring, shackle-connected to 2500 m of buoyant 19 mm diameter polypropylene mooring line (1000 m x 2 lines and one 500 m long line). The anchor was made from iron slab, and weights 3800kg. All hardware is standard equipment as used in other JAMSTEC moorings. Deployments follow the traditional anchor last routine.

As with m-TRITON mooring systems, the subsurface sensors clamp onto the wire rope strength member that serves as the inductive element. Addressable modules on the cable allow the system to be expanded for new sensors by adding the appropriate hardware and software interfaces. Flexibility in the design also allows the interface of additional sensors including barometric pressure and ocean currents. Most measurements are made at a sample rate of 1 minute. These high temporal resolution data are recorded internally and available after mooring recovery.

Last updated on December 26, 2008


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Kuroshio Transport and Surface Flux Group,

Ocean General Circulation Observational Research Program,

Institute of Observational Research for Global Change (IORGC),

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

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

JKEO web master
OGCORP
IORGC
JAMSTEC