ICHmk2

BGC unit modelled at the beginning is assigned to over a dozen BGC units - some similar ICH but some wetter ICH like mw3 and mw5 and minor amounts of MS and a bit of IDFmw2. By 2100 most models assign this to the ICHdw4 but also ICHmw2 and ICHmw3 plus multiple BGC units.

Modellling seems to be very poor likely because this BGC unit occurpies a transitional area between the wetbelt and drybelt.

Start by reviewing the BGC unit assignments described for ICHmk2, including the beginning-of-model and 2100 outputs. Compare the assignments across ICH, MS, and IDFmw2 units and clarify what modeling result or correction is expected before implementation can be considered complete.

Written by the indexing model from the issue text.