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Diagram of JKEO3, November 2008 - August
2009
The
JKEO3 mooring design is based on the m-TRITON mooring design modified for the
harsh conditions in the Kuroshio Extension region, and a little modified from
JKEO2. The
JKEO3 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. Non-rotating
3/8" (0.92 cm) diameter wire rope jacketed to 1/2" (1.27 cm)
purchased in the US 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.
8-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). An
acoustic transponder was added just above the glass spheres near bottom for
easy fixing of sinker position. 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 barometric
pressure and ocean currents. Most measurements are made at a sample rate of 10
minutes. These high temporal resolution data are recorded internally and
available after mooring recovery. Last updated on December 23, 2009 |
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Home/Overview
| Technical Info | Data
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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, |
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JKEO web master |