MBARI Ocean Observing System (MOOS)
Specifications for science instruments and data management goals for
interdisciplinary studies during the Shepard Meander Experiment.
DRAFT February 2003 |
| Upper Ocean
and Midwater |
| Variables |
Instruments, Packages, and Manufacturers |
Operational Period
Sampling Period
Acquire Time |
Power Source
operating voltage range
power consumption:
[acquire, sleep, peak] |
Data Management Goals |
Upper water column
instrument notes:
The microcat string with inductive coupling and SIM is a reliable system.
However, experience tells us that the string should not be sampled more
frequently than every hour, even with a more efficient (power, speed) NMC.
The reason is that communications between SIM and microcats requires that
all of the instruments be woken up for communication with any one.
Proceeding through comms along the string can result in multiple string
wake-up cycles that expend a lot of power. The bottleneck is the
SIM-to-microcat coupler that has a 600 baud capability. The existing
solution is to have OASIS sample every hour for the most recent data.
|
| Downwelling irradiance and upwelling radiance in water |
HOBI
Labs Hydrorad 2 |
Limit to fixed window encompassing photoperiod range for deployment
duration
10-minute
Variable and dependent upon light levels; can program to sleep after
sufficient integration period ranging from seconds in bright light to
minutes in dim light (may require modeling if mooring power system is
used) |
Mooring power system or battery
9-15 VDC
Sleep: 1 mA * 15 V = 15 mW
With both spectrometers active on single HR-2: ~1.6 W
*** Need two HR-2 instruments, one at 12 m snubber cage and one below
snubber at ~25 m
Each of the two In-water hydrorad requires additional power for copper
shutter of ~ 100 mA for 6 seconds for each actuation (each open or close
for each sample interval during daily operational period) for each of two
shutters (channels). |
Daily summary of 10-minute averaged data sent to shore; because each
average is a spectrum, may require subset constraint |
| Temperature, conductivity, and pressure, microcat string,
upper 500 m |
Multiple Seabird
SBE 37IM, SBE
37 SM and single surface inductive modem (SIM).
12 CTD nodes in total with SM at elevator (2 m) and snubber cages (12 m)
and IM at all other depths. Pressure measurement desired at all nodes. |
Continuous
10-minute
3 seconds |
Batteries can support a deployment of ~2.2 years at 10 minute resolution
without a pressure sensor on SBE 37 IM (see p. 12 of online
manual). With pressure, power and sample time are increased by ~ 1/3,
thus duration of deployment that batteries could support would be less. A
concern for deployment duration may be fouling; pumping can reduce fouling
problem but increases power requirements by ~ 3X. For OASIS, we do not
pump, and we have not seen indications of fouling causing problems for
conductivity measurement over 1-year deployments.
SIM may be powered by mooring power system; it requires 7-25 V DC and its
active operating current is 60 mA. For the M1 and M2 Microcats, the SIM
card is installed inside the Oasis can and powered from the main mooring
battery. |
Daily summary of 10-minute averaged data sent to shore. |
Chlorophyll fluorescence and particle backscattering at 5
CTD depth nodes below snubber
[2, 50,100,150,200,300] m
(chlorophyll at 12 and 25 m nodes will be from HR2). |
HOBI
Labs HS2 or WetLabs
Eco BBSB linked by SBE
UIM near SBE 37 IM nodes
|
Continuous
10-minute
30 seconds; note that instrument must be powered for an additional 12
seconds beyond the measurement period to allow for shutter open and close |
Internal batteries
HS2 specifications
10-15 VDC
1.1W typical; no sleep cycle in operation
Requires single copper shutter with current of ~ 100 mA for 6 seconds for
each actuation (each open or close for each sample interval)
Eco BBSB specifications: TBD
SBE UIM (RS 232 Standard) specifications:
7.2 Ampere hour pack |
Daily summary of 10-minute averaged data sent to shore. |
| Currents |
RDI
Workhorse Long Ranger ADCP (510m) |
Continuous
one hour
3 minutes @ 1 ping/second |
Internal (4) + external (2) batteries allow 12 month duration |
Daily summary of hourly profiles sent to shore |
| Zooplankton density |
ADCP
scattering intensity |
Continuous
one hour
3 minutes @ 1 ping/second |
Internal (4) + external (2) batteries allow 12 month duration |
Daily summary of hourly profiles sent to shore |
| Phytoplankton species |
MBARI
ESP |
Limited number of samples |
Internal battery,
One-month deployments, ideally one deployment in mixed layer and one near
seafloor |
Pictures of sample plates to shore? |
| Nitrate |
ISUS |
Continuous
1 hour
30 seconds |
Mooring power system
8-24 VDC
Acquire: 7.5 W
Sleep: less than 1 mA * 15 V = 15 mW
Peak: 1 amp @ 15 V for less than 5 milliseconds. |
Daily summary of hourly data to shore |
| Water column CO2 system (for quantifying C:N
ratios, biological draw-down) |
Colorometric pH with ISUS |
Continuous
1 hour
30 seconds |
As for ISUS/Nitrate, however will require a pump |
Daily summary of hourly data to shore |
| Bioluminescence |
Bathyphotometer,
various options
profiling if possible |
Intermittent Day
Night cycle
10-minute or Profile duration
one-second or faster |
Internal battery or mooring power system
500mA @ 12v = 6 W active
3mA @ 12v = 24mW sleep
month duration on battery |
Nightly statistics to shore |
| Phytoplankton photo-efficiency |
FRR
fluorometer
Prototype instrument (Z. Kolber) may be available & preferred |
Continuous
10-minute |
Internal battery,
? month duration |
Daily summary of hourly data to shore. |
| Iron |
OSMO
sampler based technology |
Not planned to be ready for MSE 2004; here for the long-term big picture |
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