ALBEDO OPTIMIZATION RELAUNCH

ORCHIDEE simulation configuration :

• Model : ORCHIDEE 2.2
• Forcing : CRUJRA v2 (0.5°)
• PFT maps : ESA CCI LC (1992-2018) aggregated to 0.25° with the old CWT "ESA -> Generic" and the new CWT "Generic -> ORCHIDEE"
• Period : 1992-2018 (with 10Y-spinup using fixed PFT map for 1992)
• Used in optimization : 12 monthly maps averaged for 2009-2018

Optimization configuration :

• Observations : MODIS white-sky albedo (12 monthly maps averaged for 2009-2018)
• Optimized parameters : 14 vegetation albedo coefficients (alb_leaf_nir or alb_leaf_vis)
• Background albedo : standard map (optimized in 2016) or original JRC-TIP product (mean value for 2001-2010), one static map, no change during optimization
• Minimization algorithm : L-BFGS-B
• At each iteration albedo is calculated offline following the ORCHIDEE formulations and using the outputs for variables :
• vegetfrac
• maxvegetfrac
• tot_bare_soil
• nobiofrac
• snow
• snownobio
• snowage
• snownobioage
• snowdz
• snowrho
• During optimization the data are used only from the points where 3 conditions are met together :
• MODIS has valid data (not masked)
• ORCHIDEE has valid data (not masked)
• snow is absent, i.e. ORCHIDEE simulated snow mass is equal to zero (snow = 0)

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Using standard background albedo (optimized in 2016)

ALB_NIR	PFT2	PFT3	PFT4	PFT5	PFT6	PFT7	PFT8	PFT9	PFT10	PFT11	PFT12	PFT13	PFT14	PFT15
prior	0.23	0.18	0.18	0.2	0.24	0.15	0.26	0.2	0.24	0.27	0.28	0.26	0.24	0.24
min	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1
max	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.4	0.4	0.4	0.4	0.4	0.4
post	0.189	0.2009	0.1164	0.1543	0.2731	0.1525	0.2407	0.2375	0.2307	0.2561	0.2538	0.3089	0.1	0.2469

ALB_VIS	PFT2	PFT3	PFT4	PFT5	PFT6	PFT7	PFT8	PFT9	PFT10	PFT11	PFT12	PFT13	PFT14	PFT15
prior	0.04	0.04	0.04	0.04	0.03	0.03	0.03	0.03	0.06	0.06	0.06	0.06	0.06	0.06
min	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01
max	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.1	0.1	0.1	0.1	0.1	0.1
post	0.02557	0.01214	0.01886	0.02105	0.02784	0.03372	0.0323	0.02942	0.0516	0.07246	0.06318	0.06234	0.01	0.01951

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Using original JRC-TIP background albedo regridded from 0.01° to 0.5°

ALB_NIR	PFT2	PFT3	PFT4	PFT5	PFT6	PFT7	PFT8	PFT9	PFT10	PFT11	PFT12	PFT13	PFT14	PFT15
prior	0.23	0.18	0.18	0.2	0.24	0.15	0.26	0.2	0.24	0.27	0.28	0.26	0.24	0.24
min	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1	0.1
max	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.4	0.4	0.4	0.4	0.4	0.4
post	0.1924	0.1959	0.1142	0.1589	0.2748	0.1447	0.2561	0.234	0.2459	0.2799	0.2488	0.3179	0.1537	0.2634

ALB_VIS	PFT2	PFT3	PFT4	PFT5	PFT6	PFT7	PFT8	PFT9	PFT10	PFT11	PFT12	PFT13	PFT14	PFT15
prior	0.04	0.04	0.04	0.04	0.03	0.03	0.03	0.03	0.06	0.06	0.06	0.06	0.06	0.06
min	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.01
max	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.1	0.1	0.1	0.1	0.1	0.1
post	0.0259	0.02777	0.02386	0.0244	0.01881	0.02862	0.03723	0.01	0.04254	0.03981	0.05539	0.06046	0.01	0.02734