Abstract:

Methane concentrations were measured in gas hydrate-bearing sediments near Bullseye Vent, Northern Cascadia Margin from August 7, 2009 to May 14, 2010 using a long-term sampling device to determine temporal variability. Overlying water and pore-fluid samples were collected from 25 cm above seafloor, at the sediment-water interface, and 7 cm below seafloor (cmbsf). Concentrations of in situ methane, ethane, propane, sulfate, chloride, stable carbon isotope ratios of methane (δ13C-CH4), and dissolved inorganic carbon (δ13C –DIC) were measured.

Suggested Citation:

Laura Lapham. 2016. Dataset for: “Temporal variability of in situ methane concentrations in gas hydrate-bearing sediments near Bullseye Vent, Northern Cascadia Margin”. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7N58JD2

Publications:

Lapham, L., Wilson, R., Riedel, M., Paull, C. K., & Holmes, M. E. (2013). Temporal variability of in situ methane concentrations in gas hydrate-bearing sediments near Bullseye Vent, Northern Cascadia Margin . Geochem. Geophys. Geosyst., 14(7), 2445–2459. doi:10.1002/ggge.20167

Purpose:

To assess the temporal variability in the methane fluxes from marine sediments that overly gas hydrate bearing sediments and the factors that might control its rate.

Data Parameters and Units:

Depth (OLW: overlying water 25 cm above seafloor, SWI: sediment water interface, 7 cmbsf: centimeters below seafloor); methane, sulfate, chloride, ethane, propane are in mM; stable carbon isotopes are in ppt.

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