Can WPS model heights be extended above 1Pa?

[maggiezj]

Hello everyone,
I am trying to run WRF with Initial and lateral boundary conditions which are derived from WACCM(National Center for Atmospheric Research Whole Atmosphere Community Climate Model) . The model top of WACCM is about 5.9 × 10-6 hPa (∼145 km). When I use WPS to generate the met_em.d01.*.nc file, the top level of the file can only reach 1Pa.
Can the WPS be modified to extend the top? If it can be modified, please provide me a clue? Thanks a lot!
Sincerely,
Jia Zhu

 

[maggiezj]

Hello everyone,
I followed the 'Writing Meteorological Data to the Intermediate Format' section in the user's guide to generate the Intermediate FILE. It can reach a top above 1Pa. But the met_em.d01.*.nc, which is generated by the metgrid.exe, got a top level limiting to 1Pa. I have checked the code (read_met_module.F，write_met_module.F), but didn't find the variables to modifie about the top level. If you can kindly give me some advices? Thank you so much!
Sincerely,
Jia Zhu

 

[kwerner]

Hi,
Processing data with model tops lower than 1 mb is possible in WPS. This can be done by setting the namelist variable "pmin" in &ungrib section. For e.g.,
pmin = 1.

However we don't know if the model can handle model pressure tops much lower than 1 mb or 45 km in height. We don't have any experience in this regard. You can give it a try, but it may not work well.

You may also need to compile WRF with double precision. To do this, issue the following before recompiling.

./clean -a
./configure -r8

 

[maggiezj]

Hello Kwerner,
Sincerely thanks for your help. I will have a try.