total cloud on Pressure surface

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alainF
Posts: 37
Joined: Fri Apr 19, 2019 8:12 am

total cloud on Pressure surface

Post by alainF » Wed Nov 11, 2020 9:07 pm

Hello,
Is it possible to get the output with the total cloud fraction on pressure surfaces, as a 3D field ?

Thank you

hertneky
Posts: 63
Joined: Tue May 12, 2020 4:18 pm

Re: total cloud on Pressure surface

Post by hertneky » Thu Nov 12, 2020 5:28 am

Hi,

I am not sure I understand what you mean as a 3D field. Cloud fraction is available and can be output on pressure levels.

CLD FRAC ON P SFCS in the wrf_cntrl.parm

For example, here is example UPP output using ncl_filedump (requires NCL to dump the file this way) of TCDC on isobaric levels TCDC(press,lat,lon).

float TCDC_P0_L100_GGA0 ( lv_ISBL7, lat_0, lon_0 )
center : US National Weather Service - NCEP (WMC)
production_status : Operational products
long_name : Total cloud cover
units : %
_FillValue : 1e+20
grid_type : Gaussian latitude/longitude
parameter_discipline_and_category : Meteorological products, Cloud
parameter_template_discipline_category_number : ( 0, 0, 6, 1 )
level_type : Isobaric surface (Pa)
forecast_time : 0
forecast_time_units : hours
initial_time : 10/03/2016 (00:00)

alainF
Posts: 37
Joined: Fri Apr 19, 2019 8:12 am

Re: total cloud on Pressure surface

Post by alainF » Sun Nov 15, 2020 4:50 pm

Thank you for your answer,
In the attached wrf_cntrl.parm file, I don't see the field called CLD FRAC ON P SFCS. Or maybe I don't look at the right place.
How can I change the file so that I can use it ?

Thank you for your help.
Attachments
wrf_cntrl.parm.txt
(30.56 KiB) Downloaded 13 times

hertneky
Posts: 63
Joined: Tue May 12, 2020 4:18 pm

Re: total cloud on Pressure surface

Post by hertneky » Mon Nov 16, 2020 4:10 pm

You can add a new variable by adding 2 new lines to the parm file. The parm file is a fixed format so just be sure it is aligned the same as the other parameters in the file. Just turn on any pressure levels you desire.

(CLD FRAC ON P SFCS ) SCAL=( 3.0)
L=(00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000 00000)

For future knowledge, there is a table for Grib1 available fields - although not all can be output for the WRF model.
https://dtcenter.org/sites/default/file ... able_2.pdf

Note: this link will not work soon as we are doing some major website modifications in the near future, so I would be sure to just download it.

alainF
Posts: 37
Joined: Fri Apr 19, 2019 8:12 am

Re:(SOLVED) total cloud on Pressure surface

Post by alainF » Mon Nov 16, 2020 7:03 pm

Thank you, it is working.
Documentation downloaded !

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