beta_700nm cdom chlorophyll_a conductivity crs density depth flbbcd_timestamp instrument_ctd_rbr instrument_flbbcd instrument_optode latitude longitude m_roll m_science_clothesline_lag oxy4_timestamp oxygen_concentration oxygen_saturation platform potential_temperature pressure profile_id profile_lat profile_lon profile_time salinity sci_m_present_secs_into_mission sci_m_present_time sci_water_pressure sound_speed source_file temperature time trajectory u v water_depth