Missions Parameters - Kannad PROVBIO-B Manuel Utilisateur

USER MANUAL / MANUEL UTILISATEUR

4.1. Missions parameters

PM(0) Number of Cycles
This is the number of cycles of descent, submerged drift, ascent and transmission that PROVBIO-
B will perform. The mission ends and PROVBIO-B enters Life Expiry mode when this number of
cycles has been completed.
Capacity of PROVBIO-B's batteries is sufficient for at least 150 cycles. If you wish to recover
PROVBIO-B at the end of the mission, you must set the number of cycles at less than 150 to ensure
there is sufficient battery capacity remaining to allow PROVBIO-B to return to the sea surface and
enter Life Expiry.
Under favourable conditions, the battery capacity may exceed 150 cycles. If you do not plan to
recover the float, you may choose to set the number of cycles to 255 to ensure that PROVBIO-B
completes the maximum number of cycles possible.
PM(1) Periodicity of cycles (days)
The duration of one cycle of descent, submerged drift, ascent and transmission. PROVBIO-B waits
submerged at the drift depth for as long as necessary to make the cycle the selected duration.
PM(2) Reference Date (day number)
Allows you to configure a group of floats so that they all conduct their profiles at the same time. The
parameter defines a particular day on which the first profile is to be made. When the float's internal
clock's day number equals the reference day, it will conduct its first profile.
The float's internal clock day number is set to zero when the mission starts. When setting the
reference day, it is recommended to allow enough time between the deployment and reach of
profiling depth. Using a reference day of at least 2 will ensure the first profile is complete.
PM(3) Time Surface is reached in monoprofile configuration (hours)
Time of day (UTC) to reach surface in monoprofile configuration.
PM(4) Delay Before Mission (minutes)
To prevent PROVBIO-B from trying to sink while still on deck, the float waits for this time before
commanding the buoyancy engine to start the descent. After disconnection of the PC, followed by
removal of the magnet, PROVBIO-B will wait for this delay before beginning the descent. The delay
is measured after the first start of the pump which confirms the removal of the magnet (see section
5.10.1. page 18) and before the start of the descent.
PM(5) Descent CTD Measurements Periodicity (seconds)
The time interval between successive CTD measurements during descent.
If this parameter is set to 0 seconds, no profile will be carried out during the descent phase.
Nevertheless, due to the ARGO requirements, the first descent profile of the mission is automatically
done even if the parameter was equal to 0.
PM(6) Drift CTD Measurements Periodicity (hours)
The time interval between successive CTD measurements during PROVBIO-B's stay at the drift
depth.
PM(7) Ascent CTD Measurements Periodicity (seconds)
The time interval between successive CTD measurements during ascent.
PM(8) Drift Depth (dbar)
The depth at which PROVBIO-B drifts after completion of a descent while awaiting the time
scheduled for the beginning of the next ascent.
PM(9) Depth of CTD Profile Start (dbar)
Depth to begin CTD profiling, if an ascending profile, and the ending depth, if a descend profile. If
PROVBIO-B is drifting at some shallower depth, it will first descend to the profile depth before
starting the ascent profile.
PM(10) Delay before profile (hours)
Delay to reach the profile depth. It is the time between the end of the drift phase and the beginning
of the profile. This value should be long enough to allow the float to descent from drift to profile depth
at 5 cm/s.
PM(11) Threshold surface/bottom Pressure CTD Measurements (dbar)
The isobar that divides shallow depths from deep depths for the purpose of CTD data reduction.
PROVBIO-B
PAGE : 10 / 72
DATE : 26/03/2008
INDEX : A
REF. : DOC08018