[Wrf-users] how to calculate variable near ground surface?

[Dmitry N. Mikushin]

Hi Jian Li,

The answer depends on the target purpose and the required accuracy.
>From the programming point of view, you can certainly interpolate any
variable. However, from the physical point of view, the atmosphere
below several hundreds meters might be heavily affected by the
boundary layer. Imagine, for example, a sand bowl in desert at 4 PM:
the shadowed side might be cooler, than the light side by tens of
degrees, producing strong local gradients completely different from
those interpolated. The same might apply to the dense urbanized
territory, for example.

- D.

2012/2/17 jian.li <jian.li at envisioncn.com>:
> Hi,
>
> It seems that the lowest level in the full model is usually higher than 10m.
> For example, in my wrfout, the first height is about 30m. Then how can I get
> variable at the level lower than 30m?
>
> Should I increase the eta levels near the ground? Or interpolate with some
> system outputs like T2, U10…
>
> Thanks,
>
> -----------------
>
> Sincerely yours,
>
> Jian Li
>
>
>
>
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