Which one of the following is a planetary wind ?

Planetary winds, also known as permanent or prevailing winds, are global-scale wind systems that blow consistently in the same direction throughout the year [c4][t1]. These winds are driven by the Earth's rotation and latitudinal variations in atmospheric heating, which create permanent pressure belts [c1][c3]. The primary examples of planetary winds include the Trade Winds, the Westerlies, and the Polar Easterlies [t1][t4]. In contrast, Monsoon winds are classified as periodic or secondary winds because they reverse direction seasonally [c5][t1]. Chinook and Mistral are categorized as local or tertiary winds, as they are influenced by specific geographical features and occur over limited regions [t1][t2]. Therefore, among the given options, only the Trade winds qualify as a planetary wind system that forms part of the general circulation of the atmosphere [c1][t8].

Sources

1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 23: Pressure Systems and Wind System > 23.4. Pressure systems and General Circulation > p. 316
2. [2] Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 14: Climate > Pressure and Planetary Winds > p. 139
3. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 23: Pressure Systems and Wind System > Primary winds or Prevailing Winds or Planetary Winds > p. 318
4. [4] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 23: Pressure Systems and Wind System > Secondary or Periodic Winds > p. 320