Arabian Sea bio-optics data

Process Cruises 2, 6 and 7

The transmissometer showed symptoms of photodiode decay and therefore
we assumed that the air calibrations decreased throughout these
deployments.  Unfortunately, air calibration values were missing for
Process Cruises 6 and 7.  The effective air calibration values were
adjusted to remove negative particle attenuation coefficients for the
deeper of part of the profiles (150-200m).  In addition, the
transmissometer window had been scratched sometime during the
deployments or shipping, making the factory calibration values
invalid.  In an attempt to correct the problem, the transmissometer was
compared to two other transmissometers in the CHORS laboratory to
generate a new, vicarious factory air calibration factor.


Charles C. Trees
Center for Hydro-Optics and Remote Sensing
San Diego State University

chuck@chors.sdsu.edu