[Wrf-users] Using diff_opt=2 in complex terrain (Witcraft, Nick)

Jose Jimenez jimenezg at meteologica.es
Fri Sep 17 03:32:00 MDT 2010

I have had the same problem as you during a long time. I want to use 
diff_opt =2 in order to simulate cold pools in valleys but I want the 
PBL scheme activated because my inner domain has 1 Km resolution . I 
have tried my simulations only with km_opt=4.
I´m working with a simulation of 3 months and until a week I only was 
able to simulate five days reducing time step to 180 due to cfl problems.
The problem was in a place with very steep topography and I found in WRF 
some solutions related with smoothing topography. The once that has 
worked for me is editing GEOGRID.TBL.ARW in WPS/geogrid and changing  
smooth_option = 1-2-1 and  smooth_passes=3.
With this options my simulation is still running at day 20. I hope this 
will work for you
But I have some doubts about diff_opt =2 because in shorter simulations 
compared with MM5 it seems that MM5 reproduce better cold pools. I don´t 
know if I´m wrong or it can be possible. Any idea about this issue?

*Jose Manuel Jiménez Gutiérrez*
mailto: jimenezg at meteologica.com <mailto:jimenezg at meteologica.es>

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