Overview of DALEC 1101

Overview of DALEC model

(Including new allocation)

The DALEC model (Williams et al., 2005) is an intermediate complexity terrestrial land surface and biosphere model designed primarily for observation integration within model-data integration frameworks; DALEC models have been augmented since Williams et al., (2005) to include a number of processes, such as water storage (Spadavecchia et al., 2011; Bloom et al., 2020), aerobic and anaerobic respiration processes (Ma et al., 2023), climate-sensitive phenology (Norton et al., 2023), amongst other innovations.

Overview of DALEC 1101 model

The DALEC ID=1101 model cosnists of 14 prognostic states, with the following abbreviated differential equations

*Live C states*

\(\frac{dC_{lab}}{dt} = GPP - Ra_{dark} - Ra_{maint} - Ra_{gr} - PRD_{fol} - PRD_{roo} - PRD_{woo} - DEC_{lab} - DIS_{lab} - FIR_{lab} - FIRx_{lab}\)

\(\frac{dC_{fol}}{dt} = PRD_{fol} - DEC_{fol} - DECph_{fol} - FIR_{fol} - FIRx_{fol} - DIS_{fol}\)

\(\frac{dC_{roo}}{dt} = Alloc_roo - Mortality_roo - Disturbance_roo\)

\(\frac{dC_{woo}}{dt} = Alloc_woo - Mortality_woo - Disturbance_woo\)

*Dead organic C states*

\(\frac{dC_{lit}}{dt} = Mortality_fol + Mortality_roo - Decomp_lit - Rhet_lit - Disturbance_lit\)

\(\frac{dC_{cwd}}{dt} = Mortality_woo - Decomp_cwd - Rhet_cwd- Disturbance_cwd\)

\(\frac{dC_{som}}{dt} = Decomp_cwd + Decomp_lit - Rhet_som - Disturbance_Som\)

*Water states*

\(\frac{dW_{SWE}}{dt} = Snowfall - sublimation - melt\)

\(\frac{dW_{ly1}}{dt} = Infiltration - transpiration_LY1 - evaporation - LY1_LY2_exchange - runoff_LY1\)

\(\frac{dW_{ly2}}{dt} = transpiration_LY2 + LY1_LY2_exchange - LY2_LY3_exchange - runoff_LY2\)

\(\frac{dW_{ly3}}{dt} = LY2_LY3_exchange - runoff_LY3\)

*Energy states* [TO DO]

All right-hand-side terms, and all associated subcomponents and process formulations, are reported in the individual tech note entries.