The 6 °C increase in surface temperature from burning alone was not enough to change the environmental conditions so that pyro-cumulonimbus could form. There was still a negatively buoyant layer between 4000 and 6000 m that prevented rising air from freely rising. What important additional factor changed because of the fire and why was it important?

Question

Answer

The moisture increased from the combustion of cellulose, and the resulting increase in dew-point temperature increased the level of neutral buoyancy to 16 km so that a pyro-cumulonimbus could form

Answer

The vertical winds increased because of the heating, which lifted air parcels along with ash and coals through the negatively buoyant layer between 4000 and 6000 m so the air could then freely rise to 16 km forming a pyro-cumulonimbus

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Answer

The moisture increased from the combustion of cellulose, and the resulting increase in dew-point temperature removed the negatively buoyant layer between 4000 and 6000 m so that air could freely rise from the surface to 16 km forming a pyro-cumulonimbus

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