Theory 20/Wildfire smoke/Threshold lens
Injection Needs Buoyancy
The claim
Stratospheric smoke injection requires a threshold in plume buoyancy, so most fires never reach it regardless of size.
01Mechanism
The plume must cross the tropopause, where stability rises sharply; only plumes above a buoyancy threshold penetrate.
02Prediction
Injection should occur only above a buoyancy threshold.
03Refutation
Injection tracking fire size would remove the buoyancy criterion.