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Summary:

Black and Organic Carbon, and Mineral Dust in Snow

- Particles in snow originate from atmospheric deposition and influence snow's radiative transfer properties.
- The model tracks the mass of 8 particle species within the snow layers: hydrophilic and hydrophobic black carbon, hydrophilic and hydrophobic organic carbon, and 4 size classes of mineral dust.
- Deposition rates for black and organic carbon are combined into hydrophilic and hydrophobic categories.
- Deposited particles are instantly mixed into the surface snow layer.
- Particle masses are redistributed based on meltwater drainage and snow layer changes.
- Particle mass loss through meltwater at the bottom of the snowpack is permanently lost from the model.
- Table 2.8.1 provides the meltwater scavenging efficiency for each particle species.

In summary, the model tracks the dynamics of various types of light-absorbing particles within the snowpack and how they are affected by deposition, meltwater, and snow layering processes.