One of the main factors which influences the cloud formation is the stability of the atmosphere. whether any analysis were carried out to see how the stability is influencing the ice nucleating particles (INPs)?
Unstable atmosphere will promote vertical air currents which will bring INP from the earth surface (soil & mineral dust, sand dust, bacterias, fungal spores or pollen) up to the cloud base and modifying cloud formation.
y that the opposite is also true. When supercooled water freezes around a INP in the cloud base, latent heat is released making the cloud base warmer and then creating instability promoting further instabilities.
see Wright
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Wright et al (2014) suggest that increase of RH due to cold-front passage is associated with release of biological INP creating a positive feedback for precipitation since these fragments act as IN as well. As latent heat is released it favors more instability and vertical motion
Wright, T.P, Hader, J.D., McMeeking, G.R., Peters, M.D. 2014. High relative humidity as a trigger for widespread release of ice nulei. Aerosol Sci. Technol. 48, i-v, http://dx.doi.org/10.1080/02786826.2014.968244.
The instability means that the parcel is forced to rise aloft by thermal or dynamical reasons. As long as the instability is greater the cloud depth is greater and hence influencing the INPs. The important factor that affects the ice crystals is the type of nuclie. There are not a lot of ice nuclie in the atmosphere as for cloud droplets.
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