Argo Technologies. Argo TC Inputs by S. Riser (UW) DBCP #22, Technical Workshop La Jolla, California. Argo Fleet. 2576 Active Floats. Argo Floats. A fleet of US, French, German and Japanese profiling floats. Remark: IFREMER & JAMSTEC work on a new float generation. Argo Floats. NEMO.
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Inputs by S. Riser (UW)
DBCP #22, Technical Workshop
La Jolla, California
Remark: IFREMER & JAMSTEC work on a new float generation
150-200 cycles, t = 10 days,profile to 2000 m,
Sensors: T, S, p
sampling ~100 levels
Most of floats use a SeaBird CTD.
About 200 floats (WHOI) use a FSI CTD
T accurate to 0.005 C
p accurate to 5 dbar
S accurate to 0.01 Psu
The SBE CTD unit pumps seawater through a fluid circuit;
temperature and conductivity are measured inside this loop, pressure is measured outside.
A biocide prevents fouling (growth) inside the loop.
[data from 71 levels]
UW float 063 was recovered after 3 years and recalibrated. The results showed that salinity, temperature, and pressure had all remained stable to within the manufacturer’s specifications.
High resolution T and S data (p = 2 dbar) over a 2000 m profile sampling 1000 levels
surface time 6 minutes
There are plans to modify the CTD sensor
on floats in order to measure SST; this will be
done by adding a 2nd thermistor outside of the
CTD tube that will collect samples at 1 m intervals
between a depth of 20 meters and the sea surface.
Accuracy 0.05 C.
Cost $200 per float. First tests ongoing.
There are a number of scientists interested in making
high quality measurements of SSS. This appears
to be difficult and perhaps costly and will not
be attempted soon.
SBE O2 sensor
Rainfall and wind speed can be measured acoustically
using the spectrum of ambient acoustic noise in the ocean.
The float is drifting at a depth of 700 m …
Strong seasonal variation
EM-APEX (T, S, V)
Hurricane Frances, 2004