Theory 20/Phase & ice/Cloud droplets
Activation Is Supersaturation Against CCN
The claim
Cloud droplet activation is set by the ratio of supersaturation to cloud condensation nuclei concentration, so polluted clouds have more, smaller droplets.
01Mechanism
Droplets grow only above a critical supersaturation that rises with competitor concentration.
02Prediction
Droplet number should track the ratio.
03Refutation
Number tracking nuclei alone would remove supersaturation.