Dust devils
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Dust devils form under clear skies, low wind shear, and flat terrain, where the sun heats the ground creating a temperature differential. Hot air rises rapidly, rotating as it ascends, and the system eventually dissipates when not fed by warm air. This document references a study on the formation mechanism of dust devil-like vortices in atmospheric science.
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Dust devils
- 1. Formation of Dust Devils By Sarah Allen
- 2. Dust Devils
- 3. Ideal Conditions • Clear skies- the sun heats the ground causing a temperature differential between the ground and the air • Low wind sheer- allows rotational motion • Flat terrain- makes it more likely the ground will be uniformly warmer than the air
- 4. Formation • Hot air moves rapidly upward from ground-level through colder, lower pressure atmospheric air • The air rotates as it rises • As the column stretches upward, the speed of rotation increases and ground friction causes it to move forward • As the air moves upward, it cools and eventually leaves the system • The system will dissipate when it is no longer fed by warm surface air
- 5. Source Junshi Ito, Hiroshi Niino, and Mikio Nakanishi, 2013: Formation Mechanism of Dust Devil Like Vortices in Idealized Convective Mixed Layers. J. Atmos. Sci, 70, 1173-1186 Image: http://solar.njit.edu/~cdenker/images/dust_devi l.jpg