Supplementary materials for the article (COP) "Advancing paleoclimate reconstruction of the Last Glacial Maximum in Europe using pollen data: a multi-method (mega)biomization approach" by Fénisse G, Chevalier M, Peyron O, Bekaert D.V, Blard P-H

List of Supplementary material
1. "SyntheseFile" – Compilation of pollen data sequences used in this study (Dataset_PollenCooling.xlsx)
2. "ModernCalibrationDatasets" – Modern calibration dataset including climate variables and pollen abundances (CalibrationDataset_EMPD2.xlsx)
"DatasetFass_Int" – Initial pollen spectra from La Grande Pile (de Beaulieu & Reille, 1989; de Beaulieu, 1992; de Beaulieu & Reille, 1992) and Lake Bouchet (de Beaulieu et al., 1990) (GPILXX_age_model_pollen_count.tab and Lac_du_Bouchet_age_model_pollen_count.tab, respectively)
3. "Modele_Age" – (i) Predicted ages for the sequences from La Grande Pile and Lake Bouchet (ModeleAge_LGP.txt; ModeleAge_LGP2.txt and ModeleAge_LDB.txt)
"HamonizationTable" – (i) Harmonization table (harmonization_table.txt), (ii) comparison of taxon names before and after harmonization (HarmonizationTable_Results.xlsx)
4. "Tools_BiomeScheme" – (i) Taxon-to-PFT biomization matrix (Taxpftpi_Class1.csv), and (ii) PFT-to-Biome matrix (biopftpi_Class1.csv)
"Tools_MegabiomeScheme" – (i) Pollen abundance weighting for PFT score calculation (pollen_variable.csv), and (ii) matrix linking Taxa-PFTs and PFTs-Megabiomes as described by Li et al., 2025 (Taxon_PFT_Europe.csv and PFT_Megabiomes_Europe.csv)
5. "ReconstructionMethods" – R scripts for pollen-based climate reconstructions using MAT, with biomization process (MAT-biomization.R), WA-PLS (WA-PLS-biomization.R), and CREST (CREST-biomization.R)
6. "TANNGlobaleCalibration_Results" – TANN results of global calibration reconstructions following the three pollen-based reconstruction methods (GlobaleCalibration_MAT.csv, GlobaleCalibration_WA-PLS.csv, and GlobaleCalibration_CREST.csv)
7. “ClimateOutput_LGP&LDB” - Climate series outputs from three different methods based on biome and megabiome approaches (Output_Recon_MAT_BiomeWeighted_LDB.csv, Output_Recon_MAT_BiomeWeighted_LGPSynthesis.csv, Output_Recon_WA-PLS_BiomeWeighted_LDB.csv, Output_Recon_WA-PLS_BiomeWeighted_LGPSynthesis.csv, Output_Recon_CREST_BiomeWeighted_LDB.csv, Output_Recon_CREST_BiomeWeighted_LGPSynthesis.csv)
8. "LOOCV-Results" – R scripts to evaluate pollen-based climate reconstructions using MAT, with (mega)biomization process (LOOCV_MAT.R), WA-PLS (LOOCV_WAPLS.R), and CREST (LOOCV_CREST.R)