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I have been playing around with this nice visualisation and noticed that in the mid-stratosphere (P=10hPa), the airflow around the equator and south of it is in the opposite direction to the earth's rotation [airflow relative to a fixed point on the surface], as one would expect.

In the northern hemisphere though (centered around Svalbard) the air flow is in the same direction as the rotation of the ground below and is at high velocity. This seems somewhat counter-intuitive - what is the reason for it?

enter image description here

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