Reasons for location of major hot deserts (20°–30° N, western margins):
- Subtropical High Pressure Belt: Descending dry air from Hadley Cell creates arid conditions (e.g., Sahara, Arabian).
- Cold Ocean Currents: Cold currents (e.g., Canary, California) reduce evaporation, prevent rainfall.
- Rain Shadow Effect: Proximity to mountain ranges blocks moist winds.
- Continentality: Interiors receive less moisture-bearing winds.
Western Margins Specific:
- Cold currents on western coasts inhibit cloud formation.
- Eastern margins receive moist trade winds, unlike drier western sides.
Conclusion:
Climatic and oceanic conditions collectively foster desert formation in these regions.
