<p>Yes, but it may not be valid. The extrapolation will be valid for about 0.1 * <a href="http://elte.prompt.hu/sites/default/files/tananyagok/AtmosphericChemistry/ch01s05.html" rel="noreferrer">PBL</a> Height using the <a href="https://en.wikipedia.org/wiki/Log_wind_profile" rel="noreferrer">Log-Wind</a> Profile </p>

<p>You will need:</p>

<ul>
<li>PBL Height.</li>
<li>A second Wind speed (within 0.1*PBL Height)</li>
<li>Surface Sensible Heat Flux</li>
<li>Surface Latent Heat Flux</li>
<li><a href="https://www.shodor.org/os411/courses/_master/tools/calculators/pottemp/pt1calc.html" rel="noreferrer">Potential Temperature</a></li>
</ul>

<p>You can use the last three variables to calculate the <a href="https://en.wikipedia.org/wiki/Monin%E2%80%93Obukhov_length" rel="noreferrer">Monin-Obukhov Length (MOL)</a>. Then use the MOL to calculate $\psi$:</p>

<p>If L>0 $\psi=\frac{z}{L}$</p>

<p>If L=0 $\psi=0$</p>

<p>If L&lt;0 $\psi=2\ln(\frac{1+x}{2})+\ln(\frac{1+x^2}{2})-2\tan^{-1}(x)+\frac{\pi}{2}$</p>

<p>where $x=(1-15\frac{z}{L})^{\frac{1}{4}}$</p>

<p>Now that you have $\psi$, you can derive the friction velocity and surface roughness length using the log-wind profile  and $\psi(\frac{z}{L})$. Once you have those two, you can extrapolate wind speed 600 meters up, provided the surface layer is that high.</p>

CC BY-SA 3.0
2017-05-30T22:55:18.907Z
2017-05-31T14:01:02.377Z
2017-05-31T14:01:02.377Z
BarocliniCplusplus
<p>I have some data (GRIB layers) about wind components u and v, which I would like to use to estimate wind magnitude and direction. But the model says it is for 10 m altitude. </p>

<p>Is there a way to extrapolate this value for higher altitudes? lets say 600 m. If yes, how? which other variables should I consider that can bias this calculation?</p>

<p>Thanks a lot!</p>

<meteorology><wind><air-currents>
Can we extrapolate wind speed data to higher altitudes?
MSS
# Can we extrapolate wind speed data to higher altitudes?

(Asked by: username_0 on 2017-05-30)

I have some data (GRIB layers) about wind components u and v, which I would like to use to estimate wind magnitude and direction. But the model says it is for 10 m altitude.

Is there a way to extrapolate this value for higher altitudes? lets say 600 m. If yes, how? which other variables should I consider that can bias this calculation?

Thanks a lot!

**Tags:** meteorology, wind, air-currents


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## 1 answers

### Answer by username_1 on 2017-05-30. Score: 7 | Accepted answer

Yes, but it may not be valid. The extrapolation will be valid for about 0.1 \* [PBL](http://elte.prompt.hu/sites/default/files/tananyagok/AtmosphericChemistry/ch01s05.html) Height using the [Log-Wind](https://en.wikipedia.org/wiki/Log_wind_profile) Profile

You will need:

* PBL Height.
* A second Wind speed (within 0.1\*PBL Height)
* Surface Sensible Heat Flux
* Surface Latent Heat Flux
* [Potential Temperature](https://www.shodor.org/os411/courses/_master/tools/calculators/pottemp/pt1calc.html)

You can use the last three variables to calculate the [Monin-Obukhov Length (MOL)](https://en.wikipedia.org/wiki/Monin%E2%80%93Obukhov_length). Then use the MOL to calculate $\psi$:

If L>0 $\psi=\frac{z}{L}$

If L=0 $\psi=0$

If L<0 $\psi=2\ln(\frac{1+x}{2})+\ln(\frac{1+x^2}{2})-2\tan^{-1}(x)+\frac{\pi}{2}$

where $x=(1-15\frac{z}{L})^{\frac{1}{4}}$

Now that you have $\psi$, you can derive the friction velocity and surface roughness length using the log-wind profile and $\psi(\frac{z}{L})$. Once you have those two, you can extrapolate wind speed 600 meters up, provided the surface layer is that high.


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