February 13th, 2025
@RachelLaw An apology
updates/discussion
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ESM restart @lachlanswhyborn has successfully created a more general ESM restart, which includes the new vegetation fraction for 1850 developed by @RachelLaw. We need to host this somewhere on p66 (for now) alongside a note on development process (likely plain text file).
@lachlanswhyborn raised a question as to how (if) to fill the phenology fields in the ESM restart. We need to know if these layers are used by CABLE or whether they are UM-MOSES technical dependencies that just need to be there but are not used. [@RachelLaw - information about phenology phase added here: Modify a UM restart file to work with new vegetation distribution - Earth System / Earth System Model - ACCESS Hive Community Forum] -
Australian PFT @Juergen has had initial discussion with Belinda Medlyn - the suggestion is to review the aggregations devised by de Kauwe et al. (2020) which work on aridity gradients. There will need to be further conversation/decisions around i) which 1 or 2 PFT groupings to add, ii) how to determine all parameter values for the new PFTs, iii) how to determine and cover fractions (including through time) and iv) the location within CABLE PFT table (there are technical advantages to adding these within the trees section but this creates additional work and likely represents a barrier to backwards compatibility).
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POP work and review of land use code has not progressed.
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Vegetation height ancillary @inh599 (largely driven by AM3 needs) has started looking at expanding/revising the vegetation height ancillary used in coupled models. For AM3 and ESM1.6 this is a required field for all PFTs - currently provided by a monthly climatology (similar to the LAI climatology). For CABLE4-ESM3 we could conceptually replace this field with the POP generation variable - however @Juergen notes that this likely requires additional work to ensure performance/fit for purpose as the current allometry does not seem to produce reasonable values.
The current suggestion is that vegetation height information for the grass, crop, tundra and wetlands be linked to LAI, whereas that for the trees is developed from one of the emerging global canopy height products, e.g. Potatov et al. or Land et al.
Action
- @Juergen progress POP analysis if possible.
- @lachlanswhyborn Place restart file at location on p66, inform @tiloz and @Jhan to facilitate testing of new restart in the ESM.
- @Jhan Undertake initial testing of new restart/land cover fractions to assess for bugs.
- @alexnorton and @inh599 to coordinate around vegetation height revisions.