Fig. 1. Temperature as a function of time at depths of about 200 and 400 m. Dashed red lines labeled Temp indicate temperature change due to an increase in surface temperature from 12.7 to 17.7°C, at a constant infiltration flux of 8.75 mm yr^-1. Solid blue lines labeled Flux indicate temperature change due to a decrease in infiltration flux from 87.5 to 8.75 mm yr^-1, at constant surface temperature of 17.7°C. The rate of temperature change for the portion of the curve indicated by the arrow is 0.002°C yr^-1. The curves have been plotted such that the time at which the perturbations were initiated exactly correspond. Approximately 4000 yr of the initial steady-state conditions are shown.

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