Missions Parameters - Kannad PROV-CARBON 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 PROV-
CARBON will perform. The mission ends and PROV-CARBON enters Life Expiry mode when this
number of cycles has been completed.
Capacity of PROV-CARBON's batteries is sufficient for at least 150 cycles. If you wish to recover
PROV-CARBON 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 PROV-CARBON 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 PROV-CARBON
completes the maximum number of cycles possible.
PM(1) Cycle Period (days)
The duration of one cycle of descent, submerged drift, ascent and transmission. PROV-CARBON
waits submerged at the drift depth for as long as necessary to make the cycle the selected duration.
PM(2) Reference Day (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) Ascent Time (hours)
Time of day (UTC) to start ascent profiles, according to 24-hour clock.
PM(4) Delay Before Mission (minutes)
To prevent PROV-CARBON 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, PROV-CARBON 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 5.9.1. page
PM(5) Descent CTD Measurements Sampling Period (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 Sampling Period (hours)
The time interval between successive CTD measurements during PROV-CARBON's stay at the drift
depth.
PM(7) Ascent CTD Measurements Sampling Period (seconds)
The time interval between successive CTD measurements during ascent.
PM(8) Drift Depth (dbar)
The depth at which PROV-CARBON 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
PROV-CARBON 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.
PROV-CARBON
18) and before the start of the descent.
PAGE : 9 / 70
DATE : 20/12/2007
INDEX : A
REF. : DOC07220