Table 1 This table outlines all the aerosol optical parameters and meteorological variables used in predicting NCCN, including absorption coefficient (\({\sigma }_{{\rm{ap}}}\)), scattering coefficient (\({\sigma }_{{\rm{sp}}}\)), backscattering coefficient (\({\sigma }_{{\rm{bsp}}}\)), single scattering albedo (SSA), backscatter fraction (BSF) and Angstrom exponent (AE)

From: Interpretable ensemble learning unveils main aerosol optical properties in predicting cloud condensation nuclei number concentration

Variable

Instruments/Method

Role in NCCN prediction

\({\sigma }_{{\rm{ap}}}\)

Particle soot absorption photometer (PSAP)

Reflects the aerosol number concentration, particularly the concentration of absorbing aerosols.

\({\sigma }_{{\rm{sp}}}\)

Nephelometer

Reflects the aerosol number concentration, especially sensitive to large particles.

\({\sigma }_{{\rm{bsp}}}\)

Nephelometer

Reflects the aerosol number concentration, especially sensitive to fine particles.

SSA

\(\frac{{\sigma }_{{\rm{sp}}}}{{\sigma }_{{\rm{sp}}}+{\sigma }_{{\rm{ap}}}}\)

Reflects the aerosol chemical composition and hygroscopicity.

BSF

\(\frac{{\sigma }_{{\rm{bsp}}}}{{\sigma }_{{\rm{sp}}}}\)

Reflects the shape and size of particles, more sensitive to fine particles.

AE

\(-\frac{\log \left({\sigma }_{\text{sp}}\left({\lambda }_{1}\right)/{\sigma }_{\text{sp}}\left({\lambda }_{2}\right)\right)}{\log \left({\lambda }_{1}/{\lambda }_{2}\right)}\)

Reflects the particle size, more sensitive to large particles.

  1. It specifies the measurement instruments for each parameter and their respective roles in the prediction model.
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