[Wrf-users] Question regarding determine some parameters in namelist.wps

[Carlos Ross]

Hi Zhixuan,
You're a bit confused.

e_we and e_sn are the domain dimensions. in X and Y.
geog_data_res is the resolution of the input data.
dx and dy are the resolution of the main domain.
parent_grid_ratio is the ratio starting from the main domain.

As example:

 parent_id         = 1,1,2,
 parent_grid_ratio = 1,3,3, (resolution of each domain: 27km, 9km, 3km)
 i_parent_start    = 1,20,15,
 j_parent_start    = 1,35,15,
 e_we          = 100,75,60  (domain dimensions: 100x100, 75x75, 60x60
everyone in grid points)
 e_sn          = 100,75,60
 geog_data_res = '10m','5m','2m', (input resolution for each domain)
 dx = 27000, (first domain resolution)
 dy = 27000,


2016-09-03 17:57 GMT-03:00 Zhixuan Cao <hitcaozx at gmail.com>:

> Hi
> I feel confused on the exact meaning of some parameters in namelist.wps,
> following user manual can not solve my confusion. Could someone give me
> some advice on this?
>
> Here do these following parameters work together to determine the
> resolution of grids for nested domain simulation?
> parent_grid_ratio
> i_parent_start
> j_parent_start
> e_we
> e_sn
> geog_data_res
>
> 1) If geog_data_res gives resolution of grid, then it seems that I do not
> need e_we and  e_sn.
> 2) For nested domain simulation, should geog_data_res be consistent with
> parent_grid_ratio? For example, if parent_grid_ratio = 1, 3 then
> geog_data_res has to be something like geog_data_res = 9m, 3m.
> 3) In the tutorial, it says that ( e_we = n* parent_grid_ratio +1) and (
> e_sn = n* parent_grid_ratio +1).  I guess I can use different n for e_we
> and  e_sn. Am I right? But is there any constrain on n besides that n has
> to be a positive integer?
>
> Thank you very much!
>
> Zhixuan Cao
>
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