Data Processing Notes
Biowatt II (1987)
06 Nov 2000, AJP
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General
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    The experiment site was occupied by three back-to-back mooring
    deployments over the 9 month period. The periods between recovery
    and re-deployment resulted in a gap of 2 days between the first 
    and second period and 1.5 day between the second and third period.

    A variety of physical and bio-optical parameters were measured by
    several different instruments deployed on the mooring line (Dickey
    et al., 1991; 1993). The sub-surface data reported here consist
    only of temperature and velocity measured by the MVMS.

    The MVMS temperature and velocity data were obtained from the 
    Lamont-Doherty Earth Observatory BioInfo web site for Biowatt:
    http://www.ldeo.columbia.edu/bio_info/HTMLs/moor_biowatt.html.


Meteorology
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  Sampling:

    The VAWR sampling interval for Biowatt was 7.5 min. 

  Variables measured:

    The VAWR provided a complete record of wind speed, wind direction,
    air temperature, sea surface temperature, barometric pressure,
    relative humidity and shortwave radiation during all three
    Biowatt deployments. 

    Longwave radiation and precipitation were not measured during 
    Biowatt.

  Wind Direction:

    A magnetic variation (also referred to as magnetic declination) of
    -13 degrees was applied as a rotation to the east and north wind
    components. Speed and direction were computed from the components.

    Wind directions are in oceanographic convention (direction
    towards), opposite to the meteorological convention (direction
    from).


Temperature 
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  Sampling:

    The MVMS sampling interval for Biowatt was 4 min. The temperature 
    data were averaged to 1 hr in post-processing.

  Performance:

    There were a variety of short (less than one day) data gaps in the
    temperature records due to either sensor or system malfunctions. 
    These gaps were filled by linear interpolation. 

    The temperature records from 23, 43 and 160 m depth during 
    deployment 1 had gaps greater than one day, which were not 
    interpolated. The missing data are identified with a flag value.

    The temperature records for several depths during each deployment 
    end one to three days prior to mooring recovery. The missing data 
    are identified with a flag value.

    No temperature data were available from 120 m during deployment 1
    due to a tape failure.

    The temperature record from the 43 m instrument during deployment 2
    2 ends 40 days prior to mooring recovery. The missing data are 
    identified with a flag value.

  Calibration and Adjustments:

    Laboratory calibrations of thermistors were done, but detailed
    information about possible biases and/or adjustments is not 
    available.


Velocity
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  Sampling:

    The MVMS sampling interval for Biowatt was 4 min. The velocity data 
    were averaged to 1 hr in post-processing.

  Performance:

    There were a variety of short (less than one day) data gaps in the
    velocity records due to either sensor or system malfunctions. These
    gaps were filled by linear interpolation. 

    The velocity records from 23, 23, 43 and 160 m depth during 
    deployment 1 had gaps greater than one day, which were not 
    interpolated. The missing data are identified with a flag value.

    The velocity records for several depths during each deployment end 
    one to three days prior to mooring recovery. The missing data are 
    identified with a flag value.

    No velocity data were available from 120 m during deployment 1
    due to a tape failure. 

    The velocity record from the 43 m instrument during deployment 2
    2 ends 40 days prior to mooring recovery. The missing data are 
    identified with a flag value.

  Magnetic Variation: 

    No information is available about the magnetic variation (also 
    referred to as magnetic declination) correction that may have been
    applied to Biowatt velocity data.