OPC_mocness

 PI:              Mark Huntley and Meng Zhou
 of:              Scripps Institution of Oceanography (Huntley) and
                         University of Minnesota, Duluth (Zhou)
 dataset:         Optical Plankton Counter data - MOCNESS Tows
 project/cruise:  AESOPS/NBP-97-1 - Process 2 Cruise
 ship:            Nathaniel B. Palmer

 Sampling Methodology

 Note 1: The class will not show up if nothing were counted within that class.

 Note 2: OPC data is reported on a Log10 basis.


 Parameter        Description                                       Units

 event            event number from event log
 sta              station number from event log
 cast             MOCNESS tow number
 depth_r          depth range sampled
                    lt_150 = zero to 150 meters
                    gt_150 = greater than 150 meters
 vol_filt         water volume filtered                             m^3
 counts_tot       total counts
 opc_class        class number
 opc_wt_mid       middle value of each weight class                 ugC
 opc_wt_biomass   normalized biomass spectra - weight classes       1/m^3
 opc_wt_abund     normalized abundance spectra - weight classes     1/ugC*m^3
 opc_size_mid     middle value of each ESD size class               mm
 opc_size_abund   normalized abundance spectra - ESD size classes   1/mm*m^3
 opc_size_biovol  normalized bio-volume spectra - ESD size classes  mm^3/mm*m^3
 opc_vol_mid      middle value of each volume class                 mm^3
 opc_vol_biovol   normalized bio-volume spectra - volume classes    1/m^3