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CMEM was originally developed at ECMWF for Numerical Weather Prediction applications, namely as a the forward operator for the assimilation of low frequency passive microwave observations (Holmes et al., 2008). CMEM has been extended to be a platform with modular Input/Output that include a range a physical parameterizations, some of which are also used in the Land Surface Microwave Emission Model (LSMEM) and the L-band Microwave Emission of the Biosphere (L-MEB). It comprises four modules for computing the contributions from soil, vegetation, snow and the atmosphere. The code is designed to be highly modular and for each microwave modeling component, a choice of several parameterizations are considered. More information in in de Rosnay et al 2019.
References:
de Rosnay, P., J. Muñoz-Sabater, C. Albergel, L. Isaksen, S. English, M. Drusch, J.-P. Wigneron: "SMOS brightness temperature forward modelling and long term monitoring at ECMWF", 237 (Feb 2020) https://doi.org/10.1016/j.rse.2019.111424