Which mechanism primarily deflects air parcels moving poleward in upper-level atmospheric jet streams?

💡 Explanation

As air parcels move poleward in upper-level jet streams, the Coriolis effect deflects them because Earth's rotation generates a force perpendicular to the parcel's motion, resulting in a curved trajectory. Therefore, trajectory alteration is the primary effect, rather than changes linked to gravity, thermal expansion, or friction, which have significantly lesser influence at that scale.

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