Handling of temperature units across models

[swshaheen]

ATS handles temperature in units of °K, whereas PFLOTRAN handles temperature in units of °C. In playing around with an Arrhenius scaling factor (equation 21), it appears Alquimia does not convert units, and thus PFLOTRAN is adding 273.15 to any temperature carried over from ATS via Alquimia (leading to dramatic overestimates of temperature in these calculations).