Abstract:

A Seaglider was deployed to collect oceanographic (temperature, conductivity, and pressure at a 4s rate) and acoustic data in the area surrounding three mooring sites. As part of the LADC-GEMM 2017 Gulf of Mexico experiment (R/V Pelican cruise PE17-23), the Seaglider collected data from 2017-06-09 to 2017-07-19. Several associated datasets are available at GRIIDC under different Unique Dataset Identifiers (UDIs): expendable bathythermograph (XBT) measurements (R4.x261.000:0006, doi:10.7266/N78K77F4), acoustic detections of cetaceans from bottom-moored Environmental Acoustic Recording System (EARS) buoys (R4.x261.000:0007, doi:10.7266/N76M34VG), CTD data (R4.x261.231:0006, doi:10.7266/N7MW2FHT), underway data (R4.x261.000:0031, doi:10.7266/n7-f8yc-h222; R4.x261.000:0030, doi:10.7266/n7-dbkx-vk59; R4.x261.000:0029, doi:10.7266/n7-fjhy-6w15), ADCP/CTD data (R4.x261.000:0028, doi:10.7266/N7251GS7), and surface passive acoustic data (R4.x267.233:0002, doi:10.7266/N7154FDQ; R4.x261.233:0001, doi:10.7266/N7222RSW).

Suggested Citation:

Mellinger, David, Sara Heimlich and Selene Fregosi. 2021. Glider CTD and passive acoustic data from the northern Gulf of Mexico, 2017-06-09 to 2017-07-19. Distributed by: Gulf of Mexico Research Initiative Information and Data Cooperative (GRIIDC), Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7H993J0

Purpose:

Passive acoustic data was collected to determine marine mammal distribution and abundance.

Data Parameters and Units:

The acoustic measurements have the parameters acoustic pressure (micropascals; scaled), salinity (psu), temperature (Celsius), depth (m), latitude (degrees decimal), longitude (degrees decimal), timestamp (secs), pressure (bars), sound speed (m/s). The glider CTD profiles contain a suite of science and engineering/instrumental variables: eng_depth (Measured vertical distance below the surface, [cm]), ctd_time (time of CTD sample in GMT epoch format, seconds since 1970-1-1 00:00:00, [s]), salinity_qc (corrected salinity value quality flags, [0-9]), density_insitu (sea water in-situ density based on pressure, [g/m^3]), north_displacement (northward displacement from hdm, [m]), east_displacement (eastward displacement from hdm, [m]), salinity_raw (1e-3' - uncorrected salinity derived from temperature_raw and conductivity_raw [PSU]), temperature_qc (corrected temperature value quality flag, [0-9]), eng_pitchAng (vehicle pitch, [degrees]), longitude (longitude of the sample based on hdm DAC, [degrees E]), longitude_gsm (longitude of the sample based on gsm DAC, [degrees E]), speed_gsm (vspeed based on gsm, [cm/s]), sigma_t (sigma based on density, [g/m^3]), vert_speed_gsm (vertical speed based on gsm, [cm/s]), latitude (latitude of the sample based on hdm DAC, [degrees E]), ctd_depth (CTD thermistor depth corrected for average latitude (positive is down), [m]), salinity (1e-3' - salinity corrected for thermal-inertia effects [PSU]), temperature (temperature (in situ) corrected for thermistor first-order lag, [degrees C]), temperature_raw (uncorrected temperature (in situ), [degrees C]), conductivity_raw_qc (raw conductivity value quality flag, [0-9]), north_displacement_gsm (northward displacement from gsm, [m]), eng_rollCtl, horz_speed_gsm (vehicle horizontal speed based on gsm, [cm/s]), speed_qc (hdm speed value quality flag, [0-9]), dissolved_oxygen_sat (calculated saturation value for oxygen given measured pressure and corrected temperature, and salinity, [umol/kg]), conductivity_raw (uncorrected conductivity, [S/m]), eng_elaps_t_0000 (elapsed seconds since start of mission, [s]), conductivity (conductivity corrected for anomalies, [S/m]), latitude_gsm (latitude of the sample based on gsm DAC, [degrees N]), theta (potential temperature based on corrected salinity, [degrees C]), eng_pitchCtl, buoyancy (g - buoyancy of vehicle, corrected for compression effects), east_displacement_gsm (eastward displacement from gsm [m]), eng_rollAng (vehicle roll, [degrees]), sigma_theta (sigma using potential temperature, [g/m^3]), salinity_raw_qc (raw salinity value quality flag, [0=9]), temperature_raw_qc (raw temperature value quality flag, [0=9]), speed (vehicle speed based on hdm, [cm/s]), density (sea water potential density, [g/m^3]), glide_angle (glide angle based on hdm), pressure (uncorrected sea-water pressure at pressure sensor, [dbar]), eng_head (vehicle heading (magnetic), [degrees]), glide_angle_gsm (glide angle based on gsm), eng_elaps_t (elapsed seconds since start of dive, [s]), conductivity_qc (corrected conductivity value quality flag, [0-9]), vert_speed (vehicle vertical speed based on hdm, [cm/s]), sound_velocity (sound velocity, [m/s]), ctd_pressure (pressure at CTD thermistor, [dbar]), depth (corrected for average latitude' (down is positive), [m]), time (time of the sample in GMT epoch format, seconds since 1970-1-1 00:00:00), nchorz_speed (vehicle horizontal speed based on hdm, [cm/s]), depth_avg_curr_error, GPS2_qc, CTD_qc, hdm_qc, latlong_qc, surface_curr_qc, glider, trajectory, depth_avg_curr_qc, GPS1_qc, GPSE_qc, flight_avg_speed_east, flight_avg_speed_east_gsm, flight_avg_speed_north_gsm, depth_avg_curr_east_gsm, depth_avg_curr_east, avg_latitude, surface_curr_east, depth_avg_curr_north, surface_curr_north, reviewed, start_of_climb_time, surface_curr_error, magnetic_variation, flight_avg_speed_north. Engineering/instrumental variables: eng_sbect_tempFreq (as reported by the instrument sbe41), eng_sbect_condFreq (as reported by the instrument sbe41) eng_rec, eng_GC_phase, eng_vbdCC; log_DEVICES, log_DEVICE_SECS, log_DEVICE_MAMPS, log_SM_GC, log_SENSOR_SECS, log_SENSOR_MAMPS, log_GPS1, log_GPS, log_GPS2, log_SENSORS, log_MHEAD_RNG_PITCHd_Wd, log_SM_CCo, log_ERRORS, log_IRIDIUM_FIX, log_CFSIZE, log_KALMAN_X, log_KALMAN_Y, log_TGT_LATLONG, log_TT8_MAMPS, log_KALMAN_CONTROL, log_SPEED_LIMITS, log_24V_AH, log_DATA_FILE_SIZE, log_10V_AH, log_CAP_FILE_SIZE, log_PA_UPLOADMAX, log_PA_RECORDABOVE, log_MEM, log_TGT_NAME, log_PA_STARTS, log_gps_time, log_PA_PROFILE, log_gps_lat, log_PA_XMITPROFILE, log_gps_lon, log_T_MISSION, log_VBD_MIN, log_T_ABORT, log_PITCH_AD_RATE, log_ROLL_MAX, log_PRESSURE_YINT, log_D_FINISH, log_VBD_CNV, log_T_TURN, log_VBD_MAXERRORS, log_SIM_W, log_SM_ANGLE, log_VBD_DBAND, log_PITCH_ADJ_GAIN, log_T_WATCHDOG, log_SURFACE_URGENCY_FORCE, log_ALTIM_PING_DEPTH, log_INT_PRESSURE_SLOPE, log_SURFACE_URGENCY_TRY, log_C_ROLL_DIVE, log_D_OFFGRID, log_HEAD_ERRBAND, log_PHONE_SUPPLY, log_T_RSLEEP, log_C_ROLL_CLIMB, log_ALTIM_TOP_TURN_MARGIN, log_ESCAPE_HEADING_DELTA, log_N_NOCOMM, log_D_TGT, log_W_ADJ_DBAND, log_COMM_SEQ, log_TCM_TEMP, log_HUMID, log_D_BOOST, log_ROLL_CNV, log_PITCH_CNV, sg_cal_vbd_max_cnts, log_R_STBD_OVSHOOT, log_CALL_TRIES, log_VBD_MAX, log_ALTIM_SENSITIVITY, log_SPEED_FACTOR, log_COMPASS2_DEVICE, log_VBD_PUMP_AD_RATE_SURFACE, log_VBD_BLEED_AD_RATE, log_XPDR_VALID, log_PITCH_ADJ_DBAND, log_NAV_MODE, log_LOGGERDEVICE1, log_LOGGERDEVICE2, log_LOGGERDEVICE3, log_COMPASS_DEVICE, log_PITCH_GAIN, log_D_GRID, log_CALL_NDIVES, log_USE_ICE log_ALTIM_FREQUENCY, log_T_EPIRB, log_SM_CC, log_COURSE_BIAS, log_T_DIVE, log_FIX_MISSING_TIMEOUT, log_PITCH_MIN, logSM_DEPTHo, log_ROLL_TIMEOUT, log_APOGEE_PITCH log_MAX_BUOY, log_UNCOM_BLEED, log_PRESSURE_SLOPE, log_ROLL_ADJ_GAIN, log_ESCAPE_HEADING, log_N_FILEKB, log_HEADING, log_ROLL_ADJ_DBAND, log_ALTIM_TOP_MIN_OBSTACLE, log_C_VBD, log_TGT_DEFAULT_LAT, log_ALTIM_PING_DELTA, log_COMPASS_USE, log_FG_AHR_24Vo, log_T_BOOST, log_D_SAFE, log_TCM_ROLL_OFFSET, log_GPS_DEVICE, log_FG_AHR_10Vo, log_T_GPS_CHARGE, log_TGT_RADIUS, log_RAFOS_PEAK_OFFSET, log_T_NO_W, log_ALTIM_BOTTOM_TURN_MARGIN, log_VBD_PUMP_AD_RATE_APOGEE, log_FG_AHR_10V, log_ALTIM_BOTTOM_PING_RANGE, log_FERRY_MAX, log_DIVE, log_PITCH_TIMEOUT, log_HD_A, log_HD_B, log_HD_C, log_D_PITCH, log_SEABIRD_T_H, log_MOTHERBOARD, log_SEABIRD_T_I, log_D_CALL, log_TCM_PITCH_OFFSET, log_D_SURF, log_MINV_10V, log_PITCH_MAXERRORS, log_PITCH_MAX, log_ALTIM_TOP_PING_RANGE, log_GLIDE_SLOPE, log_CAPUPLOAD, log_ROLL_DEG, log_FILEMGR, logXMS_NAKs, log_MASS, log_MINV_24V, log_N_NOSURFACE, log_AH0_10V, log_R_PORT_OVSHOOT, log_PITCH_W_DBAND, log_T_GPS, log_D_ABORT, log_DEEPGLIDER, log_ALTIM_PULSE, log_AD7714Ch0Gain, log_C_PITCH, log_D_NO_BLEED, log_TGT_AUTO_DEFAULT, log_LOGGERDEVICE4', log_D_FLARE, log_NOCOMM_ACTION, log_TGT_DEFAULT_LON, logXMS_TOUTs, log_USE_BATHY, log_N_DIVES, log_RAFOS_HIT_WINDOW, log_DEEPGLIDERMB, log_PITCH_VBD_SHIFT, log_INT_PRESSURE_YINT, log_XPDR_INHIBIT, log_CF8_MAXERRORS, log_N_GPS, log_T_LOITER, log_T_TURN_SAMPINT, log_HEAPDBG, log_SEABIRD_T_G, log_SEABIRD_T_J, log_PROTOCOL, log_RHO, log_SIM_PITCH, log_DEVICE6, log_DEVICE4, log_DEVICE5, log_DEVICE2, log_DEVICE3, log_DEVICE1, log_XPDR_DEVICE, log_CALL_WAIT, log_PITCH_DBAND, log_STROBE, log_PITCH_W_GAIN, log_XPDR_PINGS, log_ROLL_MIN, log_RAFOS_CORR_THRESH, log_P_OVSHOOT, log_AH0_24V, log_KALMAN_USE, log_VBD_TIMEOUT, log_ID, log_ROLL_AD_RATE, log_DBDW, log_SEABIRD_C_G, log_SEABIRD_C_J, log_SEABIRD_C_I, log_SEABIRD_C_H, log_SURFACE_URGENCY, log_CAPMAXSIZE, log_ROLL_MAXERRORS, log_MASS_COMP, log_INTERNAL_PRESSURE, log_LOGGERS, log_UPLOAD_DIVES_MAX, log_RELAUNCH, log_PHONE_DEVICE, log_T_GPS_ALMANAC, log_CALLS, log_MISSION, log_FG_AHR_24V, log_ICE_FREEZE_MARGIN, log_RAFOS_DEVICE; gc_vbd_ad, gc_roll_i, gc_pitch_ctl, gc_pitch_ad, gc_pitch_i, gc_vbd_pot2_ad_start, gc_vbd_i, gc_vbd_pot2_ad, gc_pitch_ad_start, gc_vbd_pot1_ad_start, gc_ob_vertv, gc_roll_retries, gc_vbd_ctl, gc_st_secs (seconds since 1970-1-1 00:00:00), gc_pitch_secs, gc_pitch_volts, gc_roll_volts, gc_roll_ad_start, gc_end_secs, gc_depth, gc_vbd_errors, gc_gcphase, gc_data_pts, gc_pitch_errors, gc_vbd_pot1_ad, gc_pitch_retries, gc_roll_ad, gc_vbd_volts, gc_roll_errors, gc_vbd_secs, gc_vbd_retries, gc_roll_secs, sg_cal_calibcomm, sbe41, sg_cal_id_str; sg_cal_volmax, sg_cal_sbe_temp_freq_max, sg_cal_c_j, sg_cal_c_h, sg_cal_c_i, sg_cal_c_g, sg_cal_t_i, sg_cal_t_h, sg_cal_t_j, sg_cal_t_g, sg_cal_mission_title, sg_cal_ctcor, sg_cal_cpcor, sg_cal_temp_ref, sg_cal_sbe_cond_freq_min, sg_cal_pitchbias, sg_cal_pitch_max_cnts, sg_cal_pump_power_intercept, depth_avg_curr_north_gsm, sg_cal_roll_max_cnts, sg_cal_mass, sg_cal_abs_compress, sg_cal_vbd_min_cnts, sg_cal_roll_min_cnts, sg_cal_pitch_min_cnts, sg_cal_vbd_cnts_per_cc, sg_cal_rho0, sg_cal_hd_a, sg_cal_hd_b, sg_cal_hd_c, sg_cal_pump_rate_intercept, sg_cal_therm_expan, sg_cal_sbe_temp_freq_min, sg_cal_pump_rate_slope, sg_cal_sbe_cond_freq_max, sg_cal_pump_power_slope. Cruise Information: R/V Pelican PE17-23; Chief Scientist: Natalia Sidorovskaia

Methods:

Acoustic data was collected when the glider was below 25 meters, on a duty cycle at a 125 kHz sampling rate, 16-bit, using a proprietary recording system called WISPR (Wideband Intelligent Signal Processor and Recorder; OSU/UW). GPS and CTD data were collected concurrently.

Instruments:

SeaGlider (Kongsberg, Inc.; OSU glider SG607)

Individual Files: