beta_700nm cdom chlorophyll_a conductivity crs ctd41cp_timestamp density depth instrument_ctd instrument_flbbcdslc latitude longitude m_pitch m_roll platform potential_temperature pressure profile_id profile_lat profile_lon profile_time salinity sci_m_present_time sci_ubat_bl_avg sci_ubat_bl_potential sci_ubat_cal_coeff_hv_step sci_ubat_file_offset sci_ubat_flow_speed sci_ubat_hv_step sci_ubat_pump_speed sci_ubat_record_num sci_ubat_system_voltage sci_water_pressure sound_speed source_file temperature time trajectory u v water_depth