Figure F34. Headspace CH4 concentrations (other sites plotted for comparison) and methane to ethane ratio with depth, Site U1427. Note that concentration values are not meaningful at depths where CH4 surpasses saturation at 1 atm pressure (~10,000 ppm at ~20 m CSF-A). Also note that measured concentrations and ratios decrease with depth because of differential gas solubility with temperature.
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