Please refer to the following document for additional information, including calibration procedures:

Slade, W.H, E. Boss, G. Dall'Olmo, M.R. Langner, J. Loftin, M.J. Behrenfeld, and C. Roesler, 2010. Underway and moored methods for improving accuray in measurement of spectral particulate absorption and attenuation. Journal of Atmospheric and Oceanic Technology, 27:10, 1733-1746

This document may be downloaded from our website at: http://misclab.umeoce.maine.edu/publications/scientific_articles.php or email us at emmanuel.boss@maine.edu.

We use a calibration independent technique to obtain particular absortpion and attenuation by differencing measurements with a 0.2um filter from measurements made with no filter. Filters are exchanged weekly and flowtubes are cleaned about every other day to once a week. Data provided is minute binned absorption data (dissolved values needed to obtain the particulate values, are linearly interpolated to the time of particulate measurements). In coastal regions switching between filtered and unfiletered measurements is done in 30min cycles while in open ocean every 60min (50min total, 10min dissolved). We use the 3rd method of Zaneveld et al., 1994 to correct for scattering with 730nm as the null wavelengths simultaneously performing a residual temperature correction (see Slade et al., 2010). We have left spectra with negative absorption in the blue regions as these values are not significantly different from zero. In extreme cases we replace bad values with -9999.

Files of the same name with ap or cp appended to the end of the name go together.  Date, time, lat, lon, temperature, and salinity are repeated in these paired files, when available.

Uncertainty files based on the standard deviation within each min are also provided.