Here is a concise summary of the article:

## Eddy Diffusivity and Thermal Conductivities in Lake Models

The article discusses the calculation of eddy diffusivity and thermal conductivities in lake models within the Community Land Model (CLM).

Key points:

### Eddy Diffusivity
- The total eddy diffusivity (Kw) is calculated as the sum of wind-driven eddy diffusivity (κe), enhanced diffusivity (Ked), and molecular diffusivity (κm).
- The wind-driven eddy diffusion coefficient (κe,i) is calculated using the 2-m wind speed, Richardson number, and other parameters.
- The enhanced diffusivity (Ked) is calculated based on the buoyancy frequency (N^2).

### Thermal Conductivity
- The thermal conductivity of the liquid water portion (τliq,i) is calculated using the eddy diffusivity, water heat capacity, and density.
- The thermal conductivity of the ice portion (τice,eff) is adjusted for the ratio of ice to liquid density.
- The overall thermal conductivity (τi) is the harmonic mean of the liquid and ice fractions.
- The thermal conductivity of snow, soil, and bedrock layers above and below the lake are computed similarly to vegetated land units.

The article provides the mathematical formulations and references for these calculations within the lake model framework of CLM.