Project Deliverable D50 Report on Best Practices ... - ESONET NoE

depth (m)
Due to inertial currents with a ~19h period the mooring oscillated and probes were able to
work as a profiler in a ~10-20 m bin for each cycle. Indeed on figure 4 each probe (CTD) is
represented by a color and each square figure represents the chlorophyll fluorescence values
recorded each day by the 4 CTDs. Days are indicated in Julian day of July and August 1996.
12/07
19/07
26/07
02/08
09/08
15/08
Figure 4: Chlorophyll fluorescence recorded by 4 fluorimeters (4 colours), 1 profile per day
(4h filtered data)
CTDF were 10-20 m distant each other (nominal depth: 40, 50 , 60, 80 m)
Considering that probes are 10-20 separated, when one probes deepens more than 10 m during
one cycle it explores the depths of the probes below. Consequently a nominal depth can be
sampled by 2 probes during one cycle and an inter-comparison is possible. For instance
between the 10 and the 15 of August (last line of squatted figures) probes were sampling a 20
m bin of the water column with important overlapping between 2 adjacent probes.
This allow us to detect some offsets and trends.
After corrections and calibration by comparison with CTDF profiles driven from onboard
during each recovering cruise, we were able to build one profile per 19h. This is shown on
figure 5.
<strong>Deliverable</strong> #50 - update October 2010 93
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