backscatter_coefficient cdom chlorophyll_a conductivity crs ctd41cp_timestamp density depth flbbcd_timestamp instrument_azfp instrument_ctd instrument_flbbcd latitude longitude m_pitch m_roll platform potential_temperature pressure profile_id profile_lat profile_lon profile_time salinity sci_azfp_file_offset sci_azfp_pause_signal sci_azfp_run_state sci_m_disk_free sci_m_present_time sci_water_pressure sound_speed source_file temperature time trajectory