Table 1.

Table 1. Model conditions and parameters for the finite difference, diffusion-advection-reaction model used to estimate methane reaction rates.

Parameter Value Source

0.266 x exp (-0.0000235 x x) + 0.459
Exponential fit to measured porosity data (Paull, Matsumoto, Wallace, et al., 1996)

0.459
Fit to porosity data

5.7 cm ky^-¹
Last appearance, Pseudoemiliania lacunosa (Paull, Matsumoto, Wallace, et al., 1996)

D_o - CH₄
7.9 x 10^-⁶ cm² s^-¹
3ºC (Li and Gregory, 1974; Lerman, 1979)

Note: x = sediment depth (cm).

Parameter	Value	Source
	0.266 x exp (-0.0000235 x x) + 0.459	Exponential fit to measured porosity data (Paull, Matsumoto, Wallace, et al., 1996)
	0.459	Fit to porosity data
	5.7 cm ky^-¹	Last appearance, Pseudoemiliania lacunosa (Paull, Matsumoto, Wallace, et al., 1996)
D_o - CH₄	7.9 x 10^-⁶ cm² s^-¹	3ºC (Li and Gregory, 1974; Lerman, 1979)