WILDFIRE SMOKE VORTEX

NEWS: Wildfire smoke plumes sometimes organise into stable rotating structures instead of dispersing irregularly.

ABOUT

• Favourable stratospheric conditionsà dense wildfire smoke can aggregate into a compact, vertically coherent bubble-like structure rather than dispersing horizontally.
• These smoke bubbles exhibità systematic rotation, clockwise in the Northern Hemisphere+ counter clockwise in the Southern Hemisphere.

Formation

• Smoke particlesà absorb incoming solar radiation= measurable warming of the surrounding air column.
• The heated air becomes less denseà generates strong buoyant forcesà driving sustained vertical ascent of the smoke mass.
• As the warming zone migrates upwardà it interacts with multiple atmospheric layers that exert differential rotational influences.
• Rising warm core temporarily induces àorganised circulation= producing a coherent vortex-like rotational collar around the smoke bubble.

Effects

• Helps preserve rotational coherence=> preventing rapid dissipation of the vortex structure.
• The rotating vortexà functions as a stabilising envelope, limiting turbulent mixing and allowing prolonged vertical persistence of the smoke bubble.
• Stable smoke vortices can persist for weeks to months
• Stratospheric smoke layers modify Earth’s radiation balance by absorbing and scattering solar energyà influencing regional temperature patterns.