height of first layer

[ensiyeh]

Hi
I have a problem with WRF-ARW. In my simulation, the first layer must be
less than 40 m. I chang layers number until 100, but my first layer height
is 54 m. I attached the name lists. Could you help me, please?
Thank you
View attachment New Text Document (4).txt

 

[Ming Chen]

In this case you need to manually specify the model levels. Below is an example:
eta_levels = 1.00000 , 0.99307 , 0.98348 , 0.97105 , 0.95551 ,
0.93651 , 0.91363 , 0.88644 , 0.85460 , 0.81855 ,
0.77877 , 0.73579 , 0.69016 , 0.64246 , 0.59329 ,
0.54573 , 0.50104 , 0.45908 , 0.41972 , 0.38281 ,
0.34824 , 0.31589 , 0.28563 , 0.25735 , 0.23096 ,
0.20635 , 0.18343 , 0.16209 , 0.14226 , 0.12384 ,
0.10677 , 0.09095 , 0.07633 , 0.06282 , 0.05036 ,
0.03889 , 0.02835 , 0.01868 , 0.00983 , 0.00000
You need to change the values based on your case.

 

[ensiyeh]

Thank you. @Ming Chen
Is there any relation between these numbers in "eta_levels "? I want to set "e_vert = 36", so I must have 36 numbers between 1 and 0. But what about the other numbers? How can I calculate them? Could you help me, please?
Thank you

 

[Ming Chen]

There is no specific formula to calculate the values of eta levels. They are experimental and one needs to specify based on his/her case.

 

[ensiyeh]

Hi Ming,

Thank you.