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OASIS :Ocean Acquisition System for Interdisciplinary Science

                                                   Photograph of Moorings in "dry dock" at the MBARI facility
Figure 1. Machinist Lauren Mitchell in the high bay during a mooring buildup. The tower and instrument cages, along with other items, are made in MBARI’s machine shop. On the left are the 3 legged towers used on the equatorial Pacific mooring, on the right is the 4 legged M1 tower used in Monterey Bay. 


Two OASIS moorings have been successfully deployed off the central California coast since 1992. Real-time access and 2-way telemetry has allowed the moorings to become test-beds for the deployment of new sensors, and widely used observational and planning tools. Over longer time scales the moorings will be an important tool for tracking environmental variability. OASIS drifters have been tested in 11 deployments off California and 3 deployments in the equatorial Pacific. 

Table 1. M3 and M4 are no longer deployed; these were deployed in 1999-2000.

Mooring Name

Decimal Latitude

Decimal Longitude

M1

36.75

-122.03

M2

36.70

-122.39

M3*

36.57

-122.96

M4*

36.19

-122.45

S2

36.66

-122.37

S3

36.50

-122.93

For a description of the OASIS controller, its deployment on moorings and drifters see Real time experimental moorings:An OASIS in Monterey Bay, California

 

Figure 2.  View of MBARI moorings, subsurface moorings, and telemetry. 
Download map as tiff image (1mb)


map of mooring locations

Figure 5. A view of the instrumented mooring M2.

  Photograph of M2

Figure 3.  Engineering view of Mooring 1 (M1) Click on the image for an enlarged view (12k)


m1 schematic

Figure 4. Diagram of the OASIS controller.  The controller is currently being redesigned.  Click on image for an enlarged view.


Schematic of the oasis controller.

Figure 6. Subsurface portion of the floatation platform. The lower section of the elevator shaft is visible with its suite of sensors. The elevator raises the sensors for easy access during in-situ maintenance.

Photograph of a mooring subsurface sensor platform

               Photograph of a retrieved mooring; the bottom of the donut and subsurface sensor cages covered in barnacles.  Biofouling

Figure 7. Biofouling on the M2 mooring, the number one problem for the moorings. The moorings are pulled in on a regular basis for maintenance: rebuild, cleaning and replacing instruments. Routine maintenance is also done in situ, with technicians boarding the mooring while
out at sea. Routine maintenance includes replacement of the large battery packs that help power the instruments

                   Telemetry tower at Mount Toro

Figure 8. Erecting the telemetry tower on Mount Toro. The advantages of two-way, real-time telemetry are several fold. It allows for quality control of data so as not to lose long, expensive mooring deployments. The data is immediately available for analysis, assimilation into models, and calibration of satellite sensors. The real-time information provided by the system can be of tactical use for shipboard experiments, especially those geared at episodic events.  Finally, instruments can be accessed remotely so that sampling frequency can be modified according to needs or troubleshooting be performed without retrieval. 

                Photograph of an MBARI drifter ready for deployment.

Figure 9. OASIS surface drifter, used in the 1995 Coastal Ocean Processes cruise,  with subsurface instrument cage ready for deployment from the Point Sur. Sensor data and GPS position are sent by packet radio via Mount Toro to MBARI and the Point Sur.

           schematic of a drifter

Figure 10. Schematic of OASIS drifter (Hans Jannasch). The OASIS controller is supported in a donut-shaped flotation collar. GPS and packet radio antennas, a radio-pinger, strobe light and lifting-eye are the above-surface components; a sensor rack at 1.5 m supported a nitrate sensor, light scattering sensor (LSS) and fluorometer during the deployment. Beneath the sensor rack a 5 m bungie and slack safety cord connect the drifter to a 10 m long ‘holey sock’ or drogue, which reduces windage.

 

Table 2. Surface Mooring Configuration. *M3, M4 deployment 1999-2000.  Mooring Data Archive

Device

Properties Measured

Platforms

Sensor Locations

Current Profiler (300,150, 75 khz ADCP) Acoustic backscatter
broadband, narrowband, long-ranger

M1, M2, M3*

Near surface
(0-300, 8m bins)

CTD  Salinity, temperature,
chlorophyll fluorescence,
optical clarity

M1, M2, M3*
Drifters

Near surface

ECO FL
Fluorescence, turbidity

M1

Near surface

ECO BB
Backscatter

M1

Near surface

ASIMET HRH
Relative humidity/air temperature

M1

Near surface

ASIMET LWR
Longwave Radiation

M1

Near surface

ASIMET SWR
Shortwave Radiation

M1

Near surface

HydroScat (HS2)
Backscatter

M1, M2

Near surface

HydroRad (HR2, HR3, HR4)
Multichannel hyperspectral radiometer

M1

Near surface

MicroCat Thermistor String

 

Temperature, Conductivity
(10 depths )

M1, M2, M3*

0, 10, 20, 40, 60, 80, 100, 150, 200, 250, 300m

MetSys Relative air humidity, air temperature, wind speed and direction, barometric pressure M1, M2, M3*

Air

GPS Latitude, longitude

M1, M2, M3*, Drifters

Air

CO2 Analyzer (LI 6252) Carbon dioxide

M1, M2, M3*

Air, near surface

Spectroradiometer (PRR, Satlantic) Upwelling radiance, Downwelling irradiance*, PAR*, MCP* (downwelling at 490nm), Fluorescence*, Temperature*, Depth* (* @ 20m)

M1, M2

0m, 20 m

Nitrate ISUS Nitrate

M1, M2, Drifters

Near surface

Echo sounder Bottom depth

M1, M2

0m

Battery, temperature, pressure Voltage, temperature, pressure

M1, M2, M3*, Drifters

Inside OASIS
controller can

OASIS Data acquisition, telemetry

M1, M2, M3*, Drifters

----

Packet Radio Telemetry

M1, M2, M3*, Drifters

----

Oxygen Sensor Oxygen, conductivity, temperature

Drifters

Near surface

Light Scattering Sensor (LSS) Optical backscatter

Drifters

Near surface

Fluorometer (WetStar) Chlorophyll fluorescence

M1, M2, Drifters

Near surface

 

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      Last Updated: 29 April, 2004