beta_880nm cdom chlorophyll_a conductivity crs ctd41cp_timestamp density depth instrument_bbfl2slo instrument_c3_fluorometer instrument_ctd latitude longitude m_pitch m_roll platform potential_temperature pressure profile_id profile_lat profile_lon profile_time salinity sci_c3sfl_cdom sci_c3sfl_chlorophyll sci_c3sfl_turbidity sci_m_present_time sci_water_pressure sound_speed source_file temperature time trajectory u v water_depth