http://bolin.su.se/data/stranne-2022-methane-1 Christian Stranne Bolin Centre Database 2022 Datafile Marine Marine Geophysics Gas hydrate Dissociation TOUGH+Hydrate Methane Seafloor methane Methane emissions Anaerobic oxidation Climate warming Earth science services > Models Christian Stranne 2022-09-01T15:39:29+00:00 English 1 The dataset contains selected model output for numerical simulations of future climate warming-induced seafloor methane escape from dissociating marine gas hydrates. Data were generated with the numerical gas hydrate model "TOUGH+Hydrate" with additional geomechanical and AOM modules included. The dataset contains three subsets of data, which are used in figures in the study by Stranne et al. (2022). File names reflect the relevant figures. ##### Figure 3 Files with names starting with fig3 contain data describing the evolution of methane gas saturation within the sediment column for three different permeabilities (10⁻¹⁷ m⁻², 10⁻¹⁵‧⁵ m⁻², 10⁻¹⁴ m⁻²) (fig3b, fig3d, fig3f). Also corresponding evolution of the cumulative anaerobic oxidation of methane and the cumulative seafloor methane escape are available (10⁻¹⁷ m⁻², 10⁻¹⁵‧⁵ m⁻², 10⁻¹⁴ m⁻²) (fig3c, fig3e, fig3g). ##### Figure 4 Files with names starting with fig4 contain data describing the equilibrium and actual sulfate-methane transition zone depths, the seafloor methane flux, the anaerobic oxidation of methane, the instantaneous and cumulative AOM efficiencies, all as functions of time. These data are for low permeability sediments (10⁻¹⁷ m⁻²). ##### Figure 5 Files with names starting with fig5 contain data describes the cumulative AOM filter efficiencies as a function of permeability for 100 years into the simulation (fig5a) and for 200 years into the simulation (fig5c). Also included are data describing the cumulative seafloor methane escape for two cases (base case and without AOM) as a function of permeability for 100 years into the simulation (fig5b) and for 200 years into the simulation (fig5d). All files in this dataset are space-delimited ascii text files. **Figure 3** (13 files, total of ~300 MB) - fig3a.asc - two columns (1: time [years], 2: seafloor temperature [°C]) - fig3b_T.asc - 144x1011 matrix (time [years] for the fig3b_GAS.asc matrix) - fig3b_Z.asc - 144x1011 matrix (depth below seafloor [m] for the fig3b_GAS.asc matrix) - fig3b_GAS.asc - 144x1011 matrix (gas saturation [%]) - fig3c.asc - three columns (1: time [years], 2: cumulative CH₄ flux [kg/m²]) - fig3d_T.asc - 144x1549 matrix (time [years] for the fig3d_GAS.asc matrix) - fig3d_Z.asc - 144x1549 matrix (depth below seafloor [m] for the fig3d_GAS.asc matrix) - fig3d_GAS.asc - 144x1549 matrix (gas saturation [%]) - fig3e.asc - three columns (1: time [years], 2: cumulative CH₄ flux [kg/m²]) - fig3f_T.asc - 144x39022 matrix (time [years] for the fig3f_GAS.asc matrix) - fig3f_Z.asc - 144x39022 matrix (depth below seafloor [m] for the fig3f_GAS.asc matrix) - fig3f_GAS.asc - 144x39022 matrix (gas saturation [%]) - fig3g.asc - three columns (1: time [years], 2: cumulative CH₄ flux [kg/m²]) **Figure 4** (3 files, total of ~20 MB) - fig4a.asc - three columns (1: time [years], 2: equilibrium SMT depth [m], 3: actual SMT depth [m]) - fig4b.asc - three columns (1: time [years], 2: AOM [mmol/m²/day], 3: CH₄ flux [mmol/m²/day]) - fig4c.asc - three columns (1: time [years], 2: instantaneous AOM efficiency [%], 3: cumulative AOM efficiency [%]) **Figure 5** (4 files, total of ~2 kB) - fig5a.asc - two columns (1: log₁₀ permeability [m⁻²], 2: cumulative filter efficiency [%]) - fig5b.asc - three columns (1: log₁₀ permeability [m⁻²], 2: Case A cumulative CH₄ escape [kg/m²], 3: Case E cumulative CH₄ escape [kg/m²]) - fig5c.asc - two columns (1: log₁₀ permeability [m⁻²], 2: cumulative filter efficiency [%]) - fig5d.asc - three columns (1: log₁₀ permeability [m⁻²], 2: Case A cumulative CH₄ escape [kg/m²], 3: Case E cumulative CH₄ escape [kg/m²])