Does bucket_mm and Bucket_j works with the fast version of the RRTMG scheme (24)?

[cross85]

I want to know if the bucket_mm and Bucket_j works with the fast version of the RRTMG scheme (24).
Here is the options I'm using:

Code: Select all

ra_lw_physics            = 24,       24,       24,       24,
ra_sw_physics            = 24,       24,       24,       24,
bucket_mm                = 100.0,
bucket_J                 = 1.e9,

[kwerner]

I haven't looked through the code thoroughly, but at a first glance, I don't see a reason why it wouldn't be. Have you tried it?

[cross85]

I'm doing some tests now.
I'm not sure if ti's using it because in the guide says "Only works with CAM and RRTMG radiation (ra_lw_physics = 3 and 4 and ra_sw_physics = 3 and 4) options" and I'm not sure how to check if these options are working.

[kwerner]

Can you point me to the guide you are looking at, because I don't see that in the current Users' Guide. What version of the model are you running?

[cross85]

I'm running WRF 4.2.1, so I was looking at this guide: http://www2.mmm.ucar.edu/wrf/users/docs ... chap5.html

Under "7. Other physics options"/"b. Other options for long simulations (new in Version 3.1)":
- bucket_J: bucket reset value for energy accumulations (value in Joules, -1 = inactive). Only works with CAM and RRTMG radiation (ra_lw_physics = 3 and 4 and ra_sw_physics = 3 and 4) options.

[kwerner]

Thanks. I'm not sure why I couldn't find that line, as I was looking in the same version, but I do see it now with your instructions. So It looks like bucket_m is able to be used with other radiation schemes, but according to the code in phys/module_physics_init.F, I believe that the bucket options CAN be used with the RRTMG Fast scheme.

[cross85]

Thanks kwerner. I hasn't been able to run the tests, but when I get the results I'll post them here for confirmation.