Power law coefficient for 10-100m and 10-200m

In the maps presented in this image library, the 10 year average power law coefficient (α) is derived with the DOWA vertical wind shear between 10 and 100 m and between 10 and 200 m.

The figures below show that the 10-year average value of the power law coefficient (α) is below 0.08 at sea and (significantly) above 0.25 on land. So, at sea the value of α derived from DOWA wind speeds is significantly lower than mentioned on Wikipedia (0.11) and on land significantly higher than on Wikipedia (0.143).  The 10-year average value of α is higher on land than at sea because the atmosphere on land is on average more stable and the vertical wind speed gradient higher than at sea. 

Power law coefficient alpha 10m-100m, 2008-2017 mean

Power law coefficient alpha 10m-100m, 2008-2017 mean

Power law coefficient alpha 10m-200m, 2008-2017 mean

Power law coefficient alpha 10m-200m, 2008-2017 mean

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