Adding new variables

[asyed6]

Hello,
I have been trying to calculate Wind speed and direction at 80 m directly from wrfout file instead of interpolating it. I am using NCEP FNL ds 083.2 input data which contains U and V at 80m height agl. I added U and V at 80m in Vtable before running ungrib exe. But there are no U80 and V80 variables coming out from wrfout file. What should I need to do to get these variables in wrfout file.?

 

[asyed6]

I am adding these 4 lines in the Vtable.GFS


GRIB1| Level| From | To | metgrid | metgrid | metgrid |GRIB2|GRIB2|GRIB2|GRIB2|
Param| Type |Level1|Level2| Name | Units | Description |Discp|Catgy|Param|Level|
-----+------+------+------+----------+---------+-----------------------------------------+-----------------------+

33 | 105 | 80 | | UU | m s-1 | U at 80 m | 0 | 2 | 2 | 103 |
34 | 105 | 80 | | VV | m s-1 | V at 80 m | 0 | 2 | 3 | 103 |
33 | 105 | 100 | | UU | m s-1 | U at 100 m | 0 | 2 | 2 | 103 |
34 | 105 | 100 | | VV | m s-1 | V at 100 m | 0 | 2 | 3 | 103 |

 

[kwerner]

Hi,
In order to use these data, you would have to make several modifications to the actual wrf model. You would need to add code into the real program so that it would know to look for these data, and then again into WRF, and into whichever physics routines may use it. You would also need to add it into the Registry.EM_COMMON file. You are welcome to try to do this, but you should know that it may be a bit involved. If so, you can follow the code for U10 and V10, but they are found in several files.

 

[asyed6]

Thanks for your reply.