Here is a concise summary of the provided article on snow compaction:

## Snow Compaction Processes

The article discusses the various processes that lead to snow compaction in the land surface model:

1. **Destructive Metamorphism**: Breakdown of new snow crystals due to wind or thermodynamic stress.

2. **Snow Load/Overburden Pressure**: Compaction caused by the weight of the overlying snow.

3. **Melting**: Changes in snow structure and crystal properties due to melt-freeze cycles and liquid water.

4. **Drifting Snow Compaction**: Compaction caused by wind-driven drifting of snow.

The total fractional compaction rate is the sum of these individual processes (Equation 2.8.30). Compaction is not allowed if the snow layer is saturated or has ice content below a minimum value (Equations 2.8.31 and 2.8.32).

The updated snow layer thickness after compaction is calculated using Equation 2.8.32.