Fort Point

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  • Station Description

    The Fort Point station is located at Fort Point Pier in San Francisco and consists of in-water and meterological sensors. The station has been operational since 2004. This station is maintained by staff of the Bodega Marine Lab and is part of the Bodege Ocean Observing Node (BOON) project.

  • Sensor Details

    Sea-Bird Electronics SBE 16+ SEACAT

    Fort Point ctd

    Description: Self contained conductivity and temperature sensor, with strain gauge pressure sensor. Pumped during sampling with SBE 5T submersible pump.

    Location: Water sampled close to Fort Point pier, San Francisco.
    Latitude 37° 48' 23.8674 N, Longitude 122° 27' 58.32 W

    Installed: 10/8/2004

    Specifications: Temperature
    Range: -5 to +35 °C, Resolution: 0.0001 °C, Accuracy: 0.005 °C

    Specifications: Conductivity
    Range: 0 to 9 S/m, Resolution: 0.00005 S/m, Accuracy: 0.0005 S/m

    Specifications: Pressure
    Range: 0 to 44 psu, Resolution: 0.002 % of full scale range, Accuracy: 0.1% of full scale range

    Acquisition Settings:
    Sample interval = 60 seconds, 10 measurements per sample
    Pumped during sample, with 10 second warm up

    WETLabs C-Star Transmissometer

    Fort Point transmissometer

    Description: The C-Star measures light transmittance at a single wavelength
    over a known path. The LED light source provides light that transmits within
    a narrow bandwidth. A portion of the transmitted light is monitored by a
    reference detector and used in a feedback circuit to account for variations
    in the LED source over time, as well as changes in the instrument’s internal
    temperature. The light transits the sample volume and enters the receiver
    optics, where it passes through additional focusing optics and finally
    strikes a silicon photodiode detector which converts the amount of received
    light to a corresponding 0–5 V analog output signal which represents the
    amount of light received. The ratio of light gathered by the receiver to
    the amount originating at the source is the beam transmittance.

    In general, losses of light propagating through water can be attributed to
    two primary causes: scattering and absorption. Suspended particles,
    phytoplankton, bacteria and dissolved organic matter, as well as the
    intrinsic optical properties of the water itself, all contribute to the
    losses sensed by the instrument.

    Location: Water sampled at Fort Point pier, San Francisco.
    Latitude 37° 48' 23.8674 N, Longitude 122° 27' 58.32 W

    Installed: 10/8/2004

    Specifications:
    Wavelength: 660 nm
    Pathlength: 25 cm
    Sensitivity: 1.25 mV
    Beam Divergence: 0.8° in water
    Bandwidth: ~ 20 nm

    Acquisition Settings:
    Sample interval: 60 seconds
    Measurements per Sample: 1

    Seapoint Chlorophyll Fluorometer

    Fort Point flourometer

    Description: High performance instrument of in situ measurements of chlorophyll a.  The open sample volume has good ambient light rejection and a low temperature coefficient.

    Location: Water sampled at Fort Point pier, San Francisco.
    Latitude 37° 48' 23.8674 N
    Longitude 122° 27' 58.32 W

    Installed: 10/8/2004

    Specifications
    Excitation Wavelength:  470 nm peak, 30 nm FBHM
    Emission Wavelength:  685 nm peak, 30 nm FBHM
    Sensing Volume:  340 mm3
    Min. Detectable Level:  0.02 µg/l
    Operating Temperature:  0 to 65 °C
    Temperature Coefficient:  <0.2 % / °C

    Acquisition Settings:
    Gain:  3x; 0.1 V / (µg/l)
    Internal low-pass filter of 0.1 second time constant
    Data logged at 10 second intervals, no averaging