Layout of the MCH destabilization model. After selection of initial parameters (box 1), heat transfer from the ice diapir to the MCH begins. This methodology assumes that any methane released escapes from the system (Scenario 1, box 4). As the intent of the modeling is to show how methane in Titan’s atmosphere is replenished, the model for Scenario 2 (box 5), where the released methane does not escape but remains in contact with the remaining water–ammonia mixture, is not shown. The model can be run to the point beyond which no more MCH is being destabilized to model the freezing of the remaining water–ammonia mixture (boxes 16 and 17). In this paper, however, we focus exclusively on the period of time over which MCH destabilization releases methane.