The Meandering (wavy) Jet stream is called as:

Question

Accepted Answer

The Meandering (wavy) Jet stream is called Rossby waves because:

*   **Rossby Waves and Jet Streams:** Rossby waves are large-scale horizontal undulations in the upper troposphere of the mid-latitudes. These waves are a fundamental feature of atmospheric circulation and are directly associated with the meandering pattern of the jet stream. The jet stream itself is a fast-flowing, narrow, meandering air current in the upper atmosphere. The "wavy" or meandering nature of the jet stream *is* the manifestation of Rossby waves. The troughs and ridges of Rossby waves correspond to the dips and peaks in the jet stream's path.

Why the other options are incorrect:

*   **Walker Cell:** The Walker cell is a circulation pattern in the tropical Pacific Ocean and atmosphere. It's characterized by rising air in the western Pacific and sinking air in the eastern Pacific. It's related to the El Niño-Southern Oscillation (ENSO) and has little to do with the meandering of the jet stream in the mid-latitudes.

*   **Ferral's Cell:** The Ferrel cell is a mid-latitude atmospheric circulation cell located between the Hadley cell and the Polar cell. While it contributes to overall atmospheric circulation, it doesn't directly *cause* the meandering pattern of the jet stream. The Ferrel cell is a consequence of the Hadley and Polar cells and is driven by them, rather than being a primary driver of jet stream waviness.

*   **Hadley Waves:** There is no established meteorological term called "Hadley waves." The Hadley cell is a tropical atmospheric circulation cell, but it's not associated with a specific wave-like pattern that directly explains the meandering of the jet stream. The Hadley cell is more about vertical circulation (rising and sinking air) than the horizontal wave-like patterns seen in the jet stream.