Theory 71/Field programme/Cloud seeding
Seeding Needs a Threshold
The claim
Cloud seeding increases precipitation only when the ratio of supercooled water to ice nuclei exceeds a threshold, which is why trials disagree.
01Mechanism
Seeding helps only where ice nuclei are the limiting factor.
02Prediction
Effect should appear only above the threshold.
03Refutation
Uniform effect across clouds would remove the condition.