MPAS | killed - signal X

KILLED BY SIGNAL: 9 (Killed)

Ouf Of Memory (OOM). A rough approximation for the memory required to run a simulation on a mesh with N cells is N * 0.175 MB

• atmosphere_model - bad termination of one of your application processes

I agree that the issue may be a memory limitation. A rough approximation for the memory required to run a simulation on a mesh with N cells is N * 0.175 MB, which suggests around 7.2 GB of memory would be required for the 120-km mesh with 40962 cells. There is more discussion on computational requirements in this thread that may be useful.