Monterey Bay Aquarium Research Institute
Ocean Observatories
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