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I then calculate sqrt(10u*10u+10v*10v), ie, calculate the wind speed from the mean U and V wind components.
However, the result is different form the 10 metre wind speed (10si). Why is this?
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The mean wind speed for the month is produced by calculating the wind speed at each individual time within the month and then averaging over the month.
Example
Consider a wind of 10ms-1 that is westerly for half of the month and easterly for the other half. The average U wind component is zero but the average (mean) wind speed is 10ms-1.
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