Zirkulationsgeschwindigkeit

I’m happy to write a wiki-style article, but I’m missing the full term after “Zirkulationsge…”. Could you please confirm the exact word or provide more context? For example, is it Zirkulationsgebiet, Zirkulationsgeographie, Zirkulationsgewitter, or another term? Also, what field or domain should this article focus on (geography, meteorology, biology, economics, etc.)? Once you provide the precise term, I’ll generate a concise, neutral article under 300 words.