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
Meteorological
Variables Instruments, Packages, and Manufacturers Operational Period
Sampling Period
Acquire Time
Power Source
operating voltage range
power consumption:
[acquire, sleep, peak]
Data Management Goals
Meteorological instrument notes: All but two of the meteorological instruments planned for MSE 2004 are part of the ASIMET package (WHOI / Star Engineering). All can operate down to ~ 8V. The current draws listed in this table differ from the online specs, and they are based on data from approximately 2 years of operating this instrument package. The WHOI group multiplies these by a safety factor of 1.25 for their power budgets. Questions about power should be directed to Dave Hosom at WHOI or Bill at Star Engineering (contact information on the ASIMET home page).
There is one key consideration for the longwave sensor, which may be particularly important for providing measurements critical to heat budget calculations for model studies. Currently the ASIMET package includes an Eppley sensor for this purpose, but this is the only instrument that does not currently have specs online. Following lab calibration, this sensor must be further calibrated relative to a better (and more expensive, German) instrument that resides on the roof of a building at WHOI (a fudge factor is applied to the Eppley sensor in this second calibration because the engineers trust the better instrument). The measurements from the Eppley LW sensor calibrated in this manner are trusted, but there is some disagreement in the community whether this fudge-factor calibration is the right way to go. Integration of the better LW sensor with the ASIMET package is being considered but would not be available for at least 1 year.
Wind speed and direction R.M. Young model 05103 wind monitor, part of ASIMET package Continuous
10-minute
10 minutes per sample
Mooring power system
8-15 VDC
Average: 12 mA * 15 V = 180 mW; no sleep cycle in operation
Daily summary of 10-minute averaged data sent to shore

Barometric Pressure
Heise DXD, part of ASIMET package Continuous
10-minute
10 minutes per sample
Mooring power system
8-15 vdc
Average: 4 mA * 15 V = 60 mW; no sleep cycle in operation
Daily summary of 10-minute averaged data sent to shore

Relative Humidity and Air temperature
Rotronic MP-101A sensor, part of ASIMET package Continuous
10-minute
10 minutes per sample
Mooring power system
8-15 vdc
Average: 2 mA * 15 V = 30 mW; no sleep cycle in operation
Daily summary of 10-minute averaged data sent to shore

Precipitation
R.M. Young model 050201 self-syphoning rain gauge, part of ASIMET package Continuous
10-minute
10 minutes per sample
Mooring power system
8-15 vdc
Average: 5 mA * 15 V = 75 mW; no sleep cycle in operation
Daily summary of 10-minute averaged data sent to shore

Shortwave radiation
Eppley Precision Spectral Pyranometer, part of ASIMET package Continuous
10-minute
10 minutes per sample
Mooring power system
8-15 VDC
Average: 5 mA * 15 V = 75 mW; no sleep cycle in operation
Daily summary of 10-minute averaged data sent to shore

Longwave radiation
Eppley sensor (no specs online), part of ASIMET package Continuous
10-minute
10 minutes per sample
Mooring power system
8-15 VDC
Average: 4 mA * 15 V = 60 mW; no sleep cycle in operation
Daily summary of 10-minute averaged data sent to shore
Downwelling irradiance and upwelling radiance in air HOBI Labs Hydrorad
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
HR-2 with both spectrometers active : ~1.6W. We want these measurements both above and below the surface. However, the elevator is not a good location for optics, so the first in-water depth for these measurements on the MOOS mooring would be the 12-m snubber cage (specified in upper water column table) . Although we could use an HR-4 on the tower and run two of the spectrometer cables down to 12-m, these would be too difficult to deal with and would be prone to damage.
Daily summary of 10-minute averaged data sent to shore; because each average is a spectrum, may require subset constraint
ΔpCO2 MBARI pCO2 system, probably employing Li-Cor GasHound Continuous
1 hour
3 minutes
Mooring Power system (though internal battery can provide ~ 1 year duration)
9-15 VDC
Acquire: 150 mA * 12 V = 1.8W
Sleep: 0.2 mA * 12 V = .24 mW
Daily summary of hourly data to shore