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sum_of_clm_tech_note/CLM50_Tech_Note_Photosynthesis/2.9.1.-Summary-of-CLM5.0-updates-relative-to-the-CLM4.5summary-of-clm5-0-updates-relative-to-the-clm4-5-Permalink-to-this-headline.md
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2.9.1. Summary of CLM5.0 updates relative to the CLM4.5

We describe here the complete photosynthesis and stomatal conductance parameterizations that appear in CLM5.0. Corresponding information for CLM4.5 appeared in the CLM4.5 Technical Note (Oleson et al. 2013).

CLM5 includes the following new changes to photosynthesis and stomatal conductance:

  • Default stomatal conductance calculation uses the Medlyn conductance model

  • \(V_{c,max}\) and \(J_{max}\) at 25 oC: are now prognostic, and predicted via optimality by the LUNA model (Chapter 2.10)

  • Leaf N concentration and the fraction of leaf N in Rubisco used to calculate \(V_{cmax25}\) are determined by the LUNA model (Chapter 2.10)

  • Water stress is applied by the hydraulic conductance model (Chapter 2.11)