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Multi-model benchmarking of PEcAn reanalysis against CMIP6 and TRENDY using ILAMB #4038

Description

@Tejas7007

Follow-on to #4019 (PEcAn-to-ILAMB conversion). That issue produced the conversion pipeline; this one covers benchmarking the converted PEcAn reanalysis against the CMIP6 and TRENDY model ensembles, and scoring the individual PEcAn SDA members.

Scope:

  • ILAMB configuration scoring PEcAn against observational benchmarks (Xu & Saatchi 2021 biomass, GIMMS LAI4g, HWSD2 soil carbon) over North America.
  • Build scripts for the CMIP6 ensemble (historical, and a historical+ssp245 splice) and the TRENDY (GCB 2024) ensemble, regridded to the PEcAn grid.
  • Per-member scoring of the 100 PEcAn SDA members to compare ensemble spread against the model ensembles.
  • Two evaluation windows (2012-2014 full CMIP6 sample; 2015-2023 longer record) reported together.

Out of scope (planned follow-ons): ensemble calibration / probabilistic scores (rank histograms, reliability); regional breakdowns; webpage hosting of the scorecard.

Deliverable: scripts, config, screening manifest, README, and a spread figure under modules/benchmark/inst/ilamb/.

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