Discussion
An air parcel in the northern hemisphere is released from rest in a region where pressure decreases towards the north.
How does it move over the following hours?
Answer: A
The parcel first accelerates down the pressure gradient towards the north, and as it gains speed the Coriolis force turns it to the right until it is flowing eastward with low pressure on its left. It then oscillates about the geostrophic state at the inertial frequency. Coriolis cannot act on a parcel at rest, so no instantaneous balance is possible, and the southward option reverses the pressure gradient force.
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