WRF CHEM 4.4.2 -- Simulation stops when using Single Layer Urban Canopy Model (forrtl: severe: SIGSEGV, segmentation fault occurred)

[Leo Matak]

Dear community,

I have been trying to run WRF CHEM simulation using the single layer UCM (sf_urban_physics = 1), like the title says. However, no matter what I try the simulation stops after some period of time. I have conducted successful simulations using no urban (sf_urban_physics = 0) or other urban models (sf_urban_physics = 2,3). The only thing that has been changes in UCM runs, is the height of the first vertical level (i.e. from 23m to 53m; dzbot =23/53 ) .

Now, reading upon some of the threads I've found in the forum, I have conducted several experiments to try and pin point what is causing the simulation to crash. However I haven't really been successful. I am posting here my default namelist, and then also I am posting all the experiments with the changes in the namelist and the outcomes of the simulation. If anyone has any idea what to try next, please let me know.