Figure 4: Simulation results from five scenarios that may explain the non-steady-state profiles. | Nature Communications

Figure 4: Simulation results from five scenarios that may explain the non-steady-state profiles.

From: Seepage from an arctic shallow marine gas hydrate reservoir is insensitive to momentary ocean warming

Figure 4: Simulation results from five scenarios that may explain the non-steady-state profiles.

We applied a comprehensive model to investigate the cause of the non-steady-state profiles. The first two scenarios (Scen1 and Scen2) can reproduce the kinks in some porewater data but fail to fit the ammonium and iron profiles. Scen3 is dedicated to simulate the porewater profiles with significant porosity contrast which is not expected. The model results fail to fit the observed profiles. Only with an increase in methane flux (Scen4), we can fit all porewater profiles with the model. Aqueous advection (Scen5) will result in concave-downwards profiles for sulfate, calcium and magnesium, which were not observed. We therefore conclude that advection is not significant at the investigated sites.

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