Summary of CLM5.0 Updates Relative to CLM4.5:

1. Time-Varying Nitrogen Deposition:
   - In offline runs, nitrogen deposition changes monthly.
   - In coupled simulations, nitrogen deposition is passed at the coupling timestep (e.g., half-hourly).

2. Asymbiotic Nitrogen Fixation:
   - Asymbiotic (or free-living) nitrogen fixation is a function of evapotranspiration.
   - The fixed nitrogen is added to the inorganic nitrogen (NH4+) pool.

3. Symbiotic Nitrogen Fixation:
   - Symbiotic nitrogen fixation is handled by the FUN model (chapter 2.18).
   - The fixed nitrogen is passed directly to the plant, not the mineral nitrogen pool.

The article summarizes the key updates to the terrestrial nitrogen inputs in the CLM5.0 model, including changes to nitrogen deposition, asymbiotic nitrogen fixation, and symbiotic nitrogen fixation, compared to the previous version, CLM4.5.