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Diagram of JKEO6, June 2012 – July 2013 (plan)
The
JKEO6 mooring design is based on the m-TRITON mooring design modified for the
harsh conditions in the Kuroshio Extension region, and its sensor arrangement
is nearly same as JKEO5. The
JKEO6 mooring is a slack mooring with scope 1.45 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 6.5 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 1240 kg, a net buoyancy of nearly 2760 kg, and an
overall height of 5.5 m. GPS wave gauge, Barometer and Rain Gauge were
equipped as same as JKEO5. 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 190 m
(designed to be 300 m) of the wire rope. 8-strand 17 mm diameter nylon lines
(1500 m x 3 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). Number of glass spheres near bottom was
increased from 12 to 18. The anchor was made from iron slab, and weights
3800kg in air. 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 ocean
currents, and two current meters were added at 15 m and 125 m depths. Most
measurements are made at a sample rate of 10 minute. These high temporal
resolution data are recorded internally and available after mooring recovery.
Last updated on Nov. 26, 2012 |
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Home/Overview
| Technical Info | Data
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Ocean-Atmosphere Interaction
Research Team, Ocean
Climate Change Research Program (OCCRP), Research Institute for Global
Change (RIGC), Japan Agency for Marine-Earth Science
and Technology (JAMSTEC) 2-15 Natsushima-cho Yokosuka-city,
Kanagawa, 237-0061, Japan |
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JKEO web master |