Abstract:

A Slocum G1 glider was deployed in the eastern Gulf of Mexico off Tampa Bay in January 2017. As the glider traversed its transit path, it made measurements at various depths from ~2 m to near the seafloor or up to 200 m. While the glider was deployed at sea, it surfaced and communicated to an onshore control station at predetermined intervals. A decimated selection of vehicle and science measurements was transmitted during these surface transmissions, and the relevant data became available through a USF web site. After the glider’s recovery at the end of the deployment, much of the complete measurement suite was downloaded from the vehicle, processed, and becomes available through the USF site, as well as a national data archive. The glider was deployed on 2017-01-03 at the 30 m isobath. It attempted to transit northwest along the Gulfstream Natural Gas Pipeline; however, southward currents prevented significant northward progress and eventually pushed the glider well to the south. It was recovered well south of Tampa Bay, off Longboat Key, on 2017-01-13. The raw measurements in this dataset include conductivity, temperature, depth, chlorophyll and gelbstoff fluorescence, and dissolved O2. The suite of related datasets includes results from gliders M66, M69, M70, and M72. Glider M66: water quality variables (FL.x707.000:0001, https://doi.org/10.7266/N72N50PF), tag telemetry (FL.x707.000:0002, https://doi.org/10.7266/n7-ccc2-s109), and echosounder backscatter intensity (FL.x707.000:0003, https://doi.org/10.7266/n7-9yq5-w169). Glider M69: water quality variables (FL.x707.000:0004, https://doi.org/10.7266/n7-n30g-bw27); acoustic tag telemetry receiver detections (FL.x707.000:0005, https://doi.org/10.7266/n7-406m-ak69), echosounder backscatter intensity (FL.x707.000:0007, https://doi.org/10.7266/n7-4skm-bj34), and passive acoustic recordings (FL.x707.000:0006, https://doi.org/10.7266/n7-5y6c-sj73). Glider M70: water quality variables (FL.x707.000:0010, https://doi.org/10.7266/g51f95wz), and tag telemetry (FL.x707.000:0008, https://doi.org/10.7266/p2ymsrp4). Glider M72: water quality variables (FL.x707.000:0011, https://doi.org/10.7266/ehj8evgw), and tag telemetry (FL.x707.000:0009, https://doi.org/10.7266/9va17amx).

Suggested Citation:

Lembke, Chad, David Mann, Susan Lowerre-Barbieri, Chris Taylor, and Steven Murawski. 2025. Eastern Gulf of Mexico glider deployment M69 (2017-01-03 -2017-01-13) – water quality variables. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/n7-n30g-bw27

Publications:

Lembke, C., Lowerre-Barbieri, S., Mann, D., & Taylor, J. C. (2018). Using Three Acoustic Technologies on Underwater Gliders to Survey Fish. Marine Technology Society Journal, 52(6), 39–52. https://doi.org/10.4031/mtsj.52.6.1

Purpose:

Demonstration of fisheries-applicable data sets obtained by underwater gliders, including tag telemetry receivers, passive acoustic recordings, and echosounder derived water column acoustic backscatter.

Data Parameters and Units:

Commanded volume of buoyancy pumped [cc], Commanded position of the battery [in), Commanded heading [rad], Height above the bottom [m), Average climbing rate [m/s], Average depth rate of change, where >0 is down [m/s], Average diving rate [m/s], Average speed [m/s], Measured volume of buoyancy pumped [cc], Battery [volts], Measured position of the battery [in], Glider depth [m], Rate of change of depth [m/s], Final Rate of change of depth [m/s], GPS Magnetic heading [rad], Latitude [lat], Longitude [lon], GPS Magnetic variation [rad], GPS speed over ground [m/s], Measured heading [rad], Latitude [DDMM.MMM], Longitude [DDDMM.MMM], Mission average speed climbing [m/s], Mission average speed diving [m/s], Measured vehicle pitch [rad], Seconds since 1/1/1970 [timestamp], Measured vehicle roll [rad], Speed [m/s], Measured internal vacuum [in Hg), Water depth (m_depth + m_altitude, [m]), Water current components VX [m/s], Water current components VY [m/s], Backscattering-reference [nodim], Backscattering-calculated [nodim], Backscattering-counts [nodim], CDOM-reference [nodim], CDOM-calculated [ppb], CDOM-counts [nodim], Chlorophyll-reference [nodim], Chlorophyll-calculated [ug/l], Chlorophyll-counts [nodim], Fluorometer temperature [ndegrees C], Fluorometer Timestamp [timestamp], Seconds since 1/1/1970 [timestamp], Oxygen [umol/L], Oxygen saturation [%], Oxygen Optode Temperature [degrees C], Conductivity [S/m], Pressure [bar], Water Temperature [deg C].

Methods:

All data were collected on underwater profiling glider and submitted as raw data.

Instruments:

Slocum Electric G1 glider (Teledyne Webb Research), with Seabird CTD, WET Labs fluorometer bb@ 650 nm), Aanderaa dissolved oxygen optode, Loggerhead Instruments passive acoustic recorders, a VEMCO Mobile Transceiver (VMT) tag telemetry receiver, and an ASL Environmental Sciences AZFP water column echosounder (single-frequency single-beam 200-kHz transducer).

Provenance and Historical References:

Lembke, Chad; Lowerre-Barbieri, Susan; Mann, David; Taylor, J. Christopher (2018). Using three acoustic technologies on underwater gliders to survey fish. Marine Technology Society Journal 52(6), 39-52. DOI: https://doi.org/10.4031/MTSJ.52.6.1

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