Why Vertical speed on the first layer is NOT ZERO?

Any issues with the actual running of the WRF.

Why Vertical speed on the first layer is NOT ZERO?

Postby taotao139 » Sat Dec 30, 2017 2:18 am

In the wrfout file, W component is defined as an vertical staggered variable.
it means that the first level of W component is actually ground level. so W component should be zero at this level.
but the from the wrfout, this variable on the first layer is always not zero!
and it is apparently related to the terrain undulation.
Why? Anybody give any explanation about how to calculate the W speed on the first layer?
Appreciate any replies.
taotao139
 
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