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I posted a similar topic under "Running" but I did not get any response and recently I tried with the latest version of V4.1.5 and still got the same problem so I think that there may be a bug in the WRF-Chem code. Basically, I am running WRF-Chem V3.9.1 and V4.1.5 on a Cray machine for a Middle East domain and my chem_opt = 300. The model runs but the optical depth variables, TAUAER1, TAUAER2, TAUAER3, TAUAER4 and the extinction coefficient, EXTCOF55, in the hourly wrfout files do not change after the second hour (i.e., they are always the second-hour value no matter how far the model runs) even though the dust fields (DUST_1-5, PM10, PM2_5_DRY) all change with the simulation time. I tried on NCAR's machine, Cheyenne, and I did not get the same problem so the problem is related to the Cray machine.I am wondering if anyone has any suggestions as to how to solve this problem.