Cumulus scheme support

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neel14
Posts: 100
Joined: Fri Mar 15, 2019 6:52 am

Cumulus scheme support

Post by neel14 » Wed Sep 30, 2020 7:24 am

Hi,
I have some confusion regarding the convective transport by the schemes. Do Grell-Freitas scheme support convective transport of chem species in WRF-Chem?
There is a pull request for implementation of GF scheme: https://github.com/wrf-model/WRF/pull/1121

However if you see this part of code from chem_driver.F

if( config_flags%cu_physics>0 .and. config_flags%chem_conv_tr>0 &
.and. config_flags%cu_physics/=kfcupscheme ) then
call wrf_debug(15,'calling conv transport for chemical species')
if(config_flags%chem_opt >0 )then

DO nv=PARAM_FIRST_SCALAR,num_chem_ct
chem_old(its:ite,kts:kte,jts:jte,nv) = chem(its:ite,kts:kte,jts:jte,chem_ct_indices(nv))
ENDDO
call grelldrvct(grid%DT,ktau,grid%DX, &
rho,grid%RAINCV_B,chem,
- - - - - - - - - - - - - - - - - --

chem_conv_tr=1 supported by Grell-freitas scheme, calls the grelldrvct from module_ctrans_grell.F which is for convective transport, wet deposition,etc.

Hence there is a conflict in my understanding whether GF scheme is implemented for convective transport,aqueous chem or not, as the pull request for its implementation and the code seem to be contradictory. It would be helpful if someone could clarify a bit. Appreciate your help & time.

Best
Neeldip

neel14
Posts: 100
Joined: Fri Mar 15, 2019 6:52 am

Re: Cumulus scheme support

Post by neel14 » Sun Oct 18, 2020 4:59 am

Hi,
It would be really helpful if someone from the admins/moderators of the forum could clarify on the issue.

Thanks.

jordanschnell
Posts: 141
Joined: Thu Feb 27, 2020 10:58 pm

Re: Cumulus scheme support

Post by jordanschnell » Tue Oct 20, 2020 4:43 pm

Hi Neeldip,

This paper explains the changes: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6999733/

This improved scheme will be in the next release, but of course you can grab the code to use yourself.

Jordan

neel14
Posts: 100
Joined: Fri Mar 15, 2019 6:52 am

Re: Cumulus scheme support

Post by neel14 » Wed Oct 21, 2020 3:30 am

Hi,
Can you share the link to the code?
I looked at https://github.com/wrf-model/WRF/tree/develop and https://github.com/wrf-model/WRF/tree/release-v4.2.2 but it is isn't implemented yet. Maybe I am looking at the wrong place.

Neeldip

jordanschnell
Posts: 141
Joined: Thu Feb 27, 2020 10:58 pm

Re: Cumulus scheme support

Post by jordanschnell » Wed Oct 21, 2020 2:54 pm

Hi Neeldip,

It has not yet been merged into the official release, but you should be able to grab the branch/files directly from the PR.

Jordan

neel14
Posts: 100
Joined: Fri Mar 15, 2019 6:52 am

Re: Cumulus scheme support

Post by neel14 » Thu Oct 22, 2020 4:56 am

Thanks Jordan!

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