The Model for Scale Adaptive River Transport, Mosart, is part of the Community Earth System Model.
IMPORTANT NOTE: MOSART is Obsolescent!
MOSART is part of CESM3, but is obsolescent.
We do not have support for creating input datasets for MOSART and as such can NOT use MOSART for Paleo work.
Longer term MOSART will be removed in future versions of CESM and the new model mizuRoute will be used for Paleo work as well as present day. It's also possible that external collaborators will support the use of MOSART for present day climate even as mizuRoute becomes the default model for CESM.
See the CESM web site for documentation and information: