Abstract:

Methane data was collected to look at the seeps at the site. Water current (speed and direction) and temperature data was also collected to look at the point sources. Oxygen data was collected using optode sensors inside and out of a chimney to look at the total oxygen consumption (TOU) of the sediment. Water current (speed and direction), temperature, turbidity, conductivity, pressure, data was also collected. Data was collected in the northern Gulf of Mexico from March 5th to April 26th, 2016.

Suggested Citation:

Chris Martens, Howard Mendlovitz. 2018. GOM minilander ADCP, CH4 and O2 data, northern Gulf of Mexico (GC600) Mega Plume, March 5, 2016 to April 26, 2016. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N79K48RR

Purpose:

Using this data we can track methane plumes and looks at the effect of the surrounding community and water column. The oxygen data was collected to calculate the TOU of the sediment and other observational sensors were used to track parameters within the site. This data can also be using to target grab sample for further detailed analysis.

Data Parameters and Units:

For variables with numbers after them: This number corresponds to the cell number. In total there were 40 cells, each having a height of 2.5 m and an overlap of 20% (10% on top and 10% on bottom); Cell 1 then is equal to 2 m off of the seafloor and cell 40 is equal to 80 m off the seafloor; Cells that are blank: data was removed that exceeded a speed horizontal std of 14, and also if it was recorded when the ADCP was operating outside of factory normal conditions. GOM minilander GC600 mega Plume ML#3 ADCP 3.2016 to 4.2016.txt: Date (MM/DD/YYYY); Time (HH:MM:SS); Lander Heading on Sea Floor (degrees); Heading std (degrees); input current (amps); input voltage (volts); Noise peak B1 (dB); Noise peak B2 (dB); Noise peak B3 (dB); Noise peak B4 (dB); Ping count (#); Pitch (degrees); Roll (degrees); Tilt abs (degrees); Tilt direction (degrees); Tilt max (degrees); Tilt std (degrees); Direction (degrees) 1-40; Speed Horizontal (cm/s) 1-40; Speed East (cm/s) 1-40; Speed North (cm/s) 1-40; Speed Vertical (cm/s) 1-40; Speed horizontal std (cm/s) 1-40; Strength (dB) 1-40; Cross Difference (cm/s) 1-40 GOM minilander GC600 Mega Plume ML#3 CH4 3.5.2016 to 3.23.2016.txt: Date (MM/DD/YYYY); Time (HH:MM:SS); Date and time (GMT); Temperature measured 0.3 m and 10 m off the seafloor (deg C); CH4 measured 0.3 m and 10 m off the seafloor (nM); Depth (m) GOM minilander GC600 Mega Plume ML#3 O2 3.2016 to 4.2016.txt: Date (MM/DD/YYYY); Time (HH:MM:SS); Date and time (GMT); Conductivity 0.3 m off seafloor (mS/cm); O2 from the Cap 0.3 m from seafloor (uM); Temperature from O2 sensor from the Cap 0.3 m from seafloor (deg C); (TOP sensor inside tube) O2 concentration (uM); (Top sensor inside tube): Temperature (deg C); (Middle sensor inside tube) O2 Concentration (uM); (Middle sensor inside tube): Temperature (deg C); (Bottom sensor inside tube) O2 concentration (uM); (Bottom sensor inside tube): Temperature (deg C); (10 m off the seafloor sensor) O2 Concentration (uM); (10 m off the seafloor sensor): Temperature (deg C); Salinity from 0.3 m off the seafloor (PSU)

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