Summary:

Vegetation Phenology and Turnover in the Community Land Model (CLM)

The CLM phenology model classifies plant functional types (PFTs) into three distinct phenological types, each represented by separate algorithms:

1. Evergreen type: A fraction of annual leaf growth persists in the displayed pool for longer than one year.
2. Seasonal-deciduous type: A single growing season per year, controlled mainly by temperature and daylength.
3. Stress-deciduous type: Potential for multiple growing seasons per year, controlled by temperature and soil moisture conditions.

These three phenology types share a common set of control variables, and the calculation of the phenology fluxes is generalized, operating identically for all three types. The article first describes the general flux parameterization, followed by the algorithms for setting the control parameters for the three phenology types.