ST equals 0 when I use fnl to run wps

[Iason27]

Hi, everyone!
I got a weird problem when I run WPS. Sometimes some grids become 0, but sometimes don't.



But I use the same namelist.wps

Could anyone help me to solve this problem?

Thanks!!!

 

[Ming Chen]

Have you looked at the FNL data and examined whether ST is zero in the original FNL?

 

[Iason27]

Have you looked at the FNL data and examined whether ST is zero in the original FNL?

I think my input data is ok. You can see:



The name of "ST" in WPS is the same thing which is called "Temperature Depth below land surface layer". Right?

Both of them have four layers.

 

[Iason27]

I am 100% sure that my namelist.wps is right. Because when I change other time periods of fnl data, all the programmes are working. So I really dont know why. Even though I change the grid resolution, the problem still exists.

 

[Ming Chen]

It is possibly because the FNL data has some hidden issues at some specific times, although I don't know exactly what they are...

 

[Iason27]

It is possibly because the FNL data has some hidden issues at some specific times, although I don't know exactly what they are...

so how to solve this problem? just change the original data? Perhaps I need to use these periods of the dataset..... Thank you

 

[Ming Chen]

ungrib has the capability to interpolate data to the specified time. I would suggest you run ungrib.exe for a specific period, for example, if your have good FNL data at 2022-02-01_06 and 2022-02-01_18, but the data at 2022-02-01_12 is wrong, then you can run ungrib over the period from 2022-02-01_06 to 2022-02-01_18, but specify interval_seconds = 21600, ungrib will produce intermediate file at 2022-02-01_12.
This is not that accurate but it is a compromise if the data is missing at 2022-02-01_12.