Summary of the Dust Model in the CTSM Documentation:

Dust Mobilization and Transport:
- The CLM dust mobilization scheme accounts for key factors like wind friction speed, vegetation cover, and soil moisture, based on the DEAD (Dust Entrainment and Deposition) model.
- The total vertical mass flux of dust (F_j) from the ground into transport bin j is calculated using Eq. (2.30.1), which considers factors like source erodibility, sandblasting mass efficiency, and total horizontal saltating mass flux (Q_s).
- The grid cell fraction of exposed bare soil suitable for dust mobilization (f_m) is calculated using Eq. (2.30.2), incorporating factors like lake/snow cover and the ratio of liquid to total soil water.
- The sandblasting mass efficiency (α) is calculated based on the clay content of the soil using Eq. (2.30.4).
- The total horizontal saltating mass flux (Q_s) is calculated using Eq. (2.30.5), which depends on the wind friction speed and threshold wind friction speed for saltation.

Threshold Wind Friction Speed:
- The threshold wind friction speed for saltation (u_*t) is calculated using Eq. (2.30.6), which considers factors like surface roughness, particle properties, and soil moisture.
- The soil moisture factor (f_w) is calculated using Eq. (2.30.7) and Eq. (2.30.8), based on the clay content and soil moisture in the top soil layer.

Dust Transport Bins:
- The mass fraction (M_i,j) of each dust source mode i in each transport bin j is calculated using Eq. (2.30.14), based on the assigned mass fraction, mass median diameter, and geometric standard deviation for each source mode.
- The dust source mode properties are provided in Table 2.30.1, and the minimum and maximum particle diameters for each transport bin are given in Table 2.30.2.