Writing surface wind components to WPS intermediate format

Questions/topics related to the first-guess input meteorological data, and Vtables
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Chris Thomas
Posts: 16
Joined: Thu Feb 21, 2019 10:45 pm

Writing surface wind components to WPS intermediate format

Post by Chris Thomas » Wed Feb 26, 2020 11:35 am

I am using the Australian Bureau of Meteorology BARRA reanalysis dataset to provide met data, and I am writing a Fortran program to convert these data to the WPS intermediate format. According to the ARW users guide (Section entitled 'Writing Meteorological Data to the Intermediate Format') real.exe requires UU and VV at 2 metres agl. The BARRA dataset provides these wind components at 10 metres which is perhaps more typical height for surface wind data (?).

For UU and VV, is 2 m a misprint in the Users Guide or does real.exe actually expect wind data at 2 m agl?
If 2 m agl is what is intended, would simply substituting the U10 and V10 data be really silly? If so, is there a way to tell WRF that we are using U10 and V10 instead of U2 and V2? Or can you suggest some other way to proceed?

Similarly the BARRA screen temperature and humidity data are at 1.5 m instead of 2 m, but I am assuming that this would make little difference. Do you agree?

Chris

Chris Thomas
Posts: 16
Joined: Thu Feb 21, 2019 10:45 pm

Re: Writing surface wind components to WPS intermediate format

Post by Chris Thomas » Thu Feb 27, 2020 9:36 pm

I think I have answered my own question: some of the Vtables have a notation or a metgrid Description that indicates that the surface wind speeds are at 10 m. Perhaps the section of the user guide titled 'Writing Meteorological Data to the Intermediate Format' could be corrected to reflect this.

Regards
Chris

kwerner
Posts: 1781
Joined: Wed Feb 14, 2018 9:21 pm

Re: Writing surface wind components to WPS intermediate format

Post by kwerner » Thu Feb 27, 2020 11:19 pm

Hi Chris,
I believe you are correct. Thank you for pointing this out. We will take care of it.
NCAR/MMM

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