SWDDIR, SWDDIF and SWDDNI in WRF-ARW.

A

Abigail Birago Adomako

New member
I am new to WRF and I am trying to estimate solar photovoltaic energy.
I read that SWDOWN is GHI but I cannot figure out DNI and DHI as well as Azimuth and Zenith angles.
Can I get some guidance?
 
Abigail Birago Adomako said:
I am new to WRF and I am trying to estimate solar photovoltaic energy.
I read that SWDOWN is GHI but I cannot figure out DNI and DHI as well as Azimuth and Zenith angles.
Can I get some guidance?
Click to expand...
Modify the Solar section of WRF/Registry/Registry.EM_COMMON file. Ex. convert rd "SWDDNI" to rhd "SWDDNI" . Then re-compile!
 
No, 'h' could be anywhere in the 8th column for a state variable.

By the way, which radiation scheme are you using? Note that not all radiation schemes calculate SWDDNI, SWDDIF, SWDDIR etc.

CAM, GODDARD, RRTMG are the schemes that can output the above variables.
 
Hi, WRF-GPU v0.4.0 now includes a solar/PV postprocessor providing GHI, DNI, DHI, solar angles and PV-power estimates without manually editing the WRF Registry; some radiation components are estimated when not directly available. It's a free, open-source, independent WRF-ARW port with no UCAR/NCAR affiliation; much has been tested against WRF-ARW v4 for bitwise or statistical agreement, but it's not guaranteed perfect. It requires a modern NVIDIA GPU (Ampere+) but then can be very fast: https://github.com/wrf-gpu/wrf_gpu
 
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