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Only exactly at the poles (i.e., where latitude is 90N or 90S), the values of the U and V components of the wind are far too low. Values are close to zero, rather than several m/s. At all other locations the winds are unaffected.
This problem is caused by the way these winds were determined from Vorticity and Divergence in spherical harmonics representation (the native model representation) when interpolated to a regular grid in the Climate Data Store.
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