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JGOFS North Atlantic Bloom Experiment
Bio-Optical profiling observations
R/V Atlantis II, 25 April - 10 May 1989
November 07, 2002
Data Description:
Optical data was collected with a Bio-Optical Profiling System (BOPS)
an updated version of the BOPS originally developed by Smith et al. (1984).
The heart of the BOPS is a Biospherical instruments MER-1048 Spectroradiometer
which measures up and downwelling spectral irradiance and upwelling spectral
radiance. The MER-1048 also has sensors for Photosynthetically Available
Radiation (PAR), depth, tilt and roll. In addition, temperature and conductivity
are measured with a Sea-Bird CTD, chlorophyll fluorescence is measured with
a Sea Tech fluorometer and beam transmission with a Sea Tech 25-cm transmissometer.
The Mer-1048 acquires all the data 16 times a second, averages it to four
records a second and sends it up the cable to a deck box and a Compaq-286
computer which stores the data on the hard disk. Additionally, a deck cell
measures the downwelling surface irradiance in four spectral channels. Also
surface PAR was measured continuously using a Biospherical Instruments QSR-240
Integrating PAR sensor. The profile data was filtered to remove obvious
data spikes and then binned into one-meter averages.
Reference:
Smith, R.C., C.R. Booth, and J.L. Star, Oceanographic
bio-optical profiling system. Applied Optics, 23, 2791-2797, 1984
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