Atmospheric science question. I think answer A is correct, but I am unsure if je

Question

Atmospheric science question.

I think answer A is correct, but I am unsure if jet streams are accociated with "surface baroclinicity". My understanding is that they occur in the tropopause and are to do with frontal boundaries and not the Earth's surface, which makes me think answer D may be correct. Please explain your reasoning, thank you very much!

Jet streams are: a) fast-moving ribbons of air at the tropopause levels associated with surface baroclinicity b) fast winds at the surface c) ionosphere phenomena d) none of the above

Explanation / Answer

Answer: a) fast moving ribbons of air at the tropopause levels assosiated with surface baroclinicity.

Explanation: Jet streams are fast flowing, narrow, meandering air currents in the atmospheres of some planets, including Earth. The main jet streams are located near the altitude of the tropopause and are westerly winds (flowing west to east). Jet streams are relatively narrow bands of strong wind in the upper levels of the atmosphere. It consists of ribbons of very strong winds which move weather systems around the globe. The strongest jet streams are the polar jets, at 9–12 km above sea level, and the higher altitude and somewhat weaker subtropical jets at 10–16 km.

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