About rdlai2d option in WRF-CHEM3.5.1

Questions related to the use of new landuse, or geographical static data, or to modifications to the existing data
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yujiaoyang
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Joined: Tue Jan 07, 2020 8:56 am

About rdlai2d option in WRF-CHEM3.5.1

Post by yujiaoyang » Fri Jun 26, 2020 3:16 pm

Hello! Thank you very much for reading my post.
I am using WRF-chem3.5.1, I have made a LAI binary file, and already have external LAI data in the met_em_d01 file. Is the rdlai2d function in namelist.input unavailable in WRF-chem 3.5.1? The WRF manual says that this rdlai2d option is available from WRFV3.6. But I use WRF-Chem3.5.1, is there a way to read external LAI data in WRF-chem3.5.1? I look forward to your reply!

Ming Chen
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Joined: Mon Apr 23, 2018 9:42 pm

Re: About rdlai2d option in WRF-CHEM3.5.1

Post by Ming Chen » Fri Jun 26, 2020 5:32 pm

In this case, you will have to modify the codes of WRF-CHEMV3.5.1. You may refer to those relevant codes in WRFV3.6 and learn how to do it.
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yujiaoyang
Posts: 8
Joined: Tue Jan 07, 2020 8:56 am

Re: About rdlai2d option in WRF-CHEM3.5.1

Post by yujiaoyang » Sat Jun 27, 2020 3:50 am

Thanks for your reply!Is the code related to reading the external LAI in module_sf_noahlsm.F 、module_sf.noahdrv.F, and module_initial_real.F? I am not very familiar with the WRF code, I look forward to your reply and appreciate your help!

Ming Chen
Posts: 892
Joined: Mon Apr 23, 2018 9:42 pm

Re: About rdlai2d option in WRF-CHEM3.5.1

Post by Ming Chen » Mon Jun 29, 2020 4:02 pm

If you run with Noah, you need to modify the following codes:
phys/module_surface_driver.F
phys/module_sf_noahdrv.F
phys/module_sf_noahlsm.F
dyn_em/module_first_rk_step_part1.F

The changes involved with this option is not that complicated, but you do need to understand Fortran.
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yujiaoyang
Posts: 8
Joined: Tue Jan 07, 2020 8:56 am

Re: About rdlai2d option in WRF-CHEM3.5.1

Post by yujiaoyang » Wed Jul 01, 2020 3:53 am

Thanks for your help! I now use another method to read the external LAI with the higher version of WRF-chem 3.6.1, running real.exe and get the updated LAI variable, then copy LAI variable to the wrfinput in wrf3.5.1 . When running WRF-chem 3.5.1, set rdlai2d = .true in namelist.input.
This can also successfully run and read the external LAI 12 months data.
Thank you very much,best wishes for you!

Ming Chen
Posts: 892
Joined: Mon Apr 23, 2018 9:42 pm

Re: About rdlai2d option in WRF-CHEM3.5.1

Post by Ming Chen » Wed Jul 01, 2020 8:07 pm

Thank you for the update of this issue. I guess this will be helpful for others who may want to do the same. We appreciate your input !
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