beta_700nm cdom chlorophyll_a conductivity crs density depth instrument_ctd instrument_flbbslc instrument_optode instrument_parad latitude longitude m_pitch m_roll oxygen_concentration platform potential_temperature pressure profile_id profile_lat profile_lon profile_time salinity sci_bsipar_par sci_m_disk_free sci_m_present_time sci_water_pressure sound_speed source_file temperature time trajectory u v water_depth