mixed_layer

 PI:              Walker O. Smith
 of:              University of Tennesee, Knoxville
 dataset:         Ross Sea Mixed Layer Depths
 project/cruise:  AESOPS/NBP-96-4A - Ross Sea Process Cruise 1
                  AESOPS/NBP-97-1  - Ross Sea Process Cruise 2
                  AESOPS/NBP-97-3  - Ross Sea Process Cruise 3
                  AESOPS/NBP-97-8  - Ross Sea Process Cruise 4
 ship:            Nathaniel B. Palmer

 Parameter        Description                                             Units

 cruise_id        cruise ID number
 cruise_type      process number
 event            event number, from event log
 sta              station number, from event log
 cast             cast number, from event log 
 date             date as YYYYMMDD
 yrday            day of year where Jan 1 = day 1
 lat_begin        starting latitude of cast, negative = south             decimal degrees
 lon_begin        starting longitude of cast, negative = west             decimal degrees
 MLD_0d01_d       mixed layer depth as defined by a change in sigma-t     meters
                    of 0.01 from the surface value
 MLD_0d02_d       mixed layer depth as defined by a change in sigma-t     meters
                    of 0.02 from the surface value
 MLD_0d05_d       mixed layer depth as defined by a change in sigma-t     meters
                    of 0.05 from the surface value
 depth_light_1    depth of 1% light level penetration                     meters
 depth_light_0d1  depth of 0.1% light level penetration                   meters