GlennDoodle
New member
Hi,
I have been trying to do a baseline case between a set of runs using WRFV3.8 and WRFV4.2. When I was comparing my runs the WRFV4.2 runs were systematically 2-2.5 degrees cooler than the WRF3.8 runs. For these runs I am using the SCM for all my runs. Initially I was comparing runs using MYJ, MYNN2, and MYNN3. To further isolate this issue, I decided to run with the bl scheme turned off as well as the surface_physics scheme turned off. With those options off my results were very comparable. It appears that the differences are coming from the surface_physics scheme. When I run with the following options:
sf_sfclay_physics = 2,
sf_surface_physics = 2,
bl_pbl_physics = 0,
(no pbl scheme) the temperature issue arose again. Also I noticed the the Latent Heat Flux was significantly different (over 100Wm-2 difference…see attached). (see attached). I am trying to figure out if I have some sort of set-up issue that is causing this difference. I have attached my namelist files showing my settings. I am using the default input_sounding and input_soil that are default files in test/em_scm_xy.
The second strange behavior (and another thing making me leery about my 4.2 SCM build is that when I change my sf_surface_physics switch (e.g. = 1) the model runs even if I set the num_soil_layers switch inappropriately. I set num_soil_layers to 10 and wrf3.8 exited with a warning but the wrf4.2 ran as if nothing was wrong.
Please let me know if there is something I can check regarding my configuration that may be causing these large differences.
Thanks,
Glenn
I have been trying to do a baseline case between a set of runs using WRFV3.8 and WRFV4.2. When I was comparing my runs the WRFV4.2 runs were systematically 2-2.5 degrees cooler than the WRF3.8 runs. For these runs I am using the SCM for all my runs. Initially I was comparing runs using MYJ, MYNN2, and MYNN3. To further isolate this issue, I decided to run with the bl scheme turned off as well as the surface_physics scheme turned off. With those options off my results were very comparable. It appears that the differences are coming from the surface_physics scheme. When I run with the following options:
sf_sfclay_physics = 2,
sf_surface_physics = 2,
bl_pbl_physics = 0,
(no pbl scheme) the temperature issue arose again. Also I noticed the the Latent Heat Flux was significantly different (over 100Wm-2 difference…see attached). (see attached). I am trying to figure out if I have some sort of set-up issue that is causing this difference. I have attached my namelist files showing my settings. I am using the default input_sounding and input_soil that are default files in test/em_scm_xy.
The second strange behavior (and another thing making me leery about my 4.2 SCM build is that when I change my sf_surface_physics switch (e.g. = 1) the model runs even if I set the num_soil_layers switch inappropriately. I set num_soil_layers to 10 and wrf3.8 exited with a warning but the wrf4.2 ran as if nothing was wrong.
Please let me know if there is something I can check regarding my configuration that may be causing these large differences.
Thanks,
Glenn