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EC-Earth – Copenhagen, Sep. 7/8, 2011 Coupling LPJ-GUESS to EC-Earth – Progress to Date and Plans

EC-Earth – Copenhagen, Sep. 7/8, 2011 Coupling LPJ-GUESS to EC-Earth – Progress to Date and Plans. Lund University - Paul Miller, Guy Schurgers, Ben Smith, Almut Arneth KNMI – Philippe Le Sager, Martina Weiss, Bart van den Hurk. Outline. LPJ-GUESS version 2.1 & Motivation

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EC-Earth – Copenhagen, Sep. 7/8, 2011 Coupling LPJ-GUESS to EC-Earth – Progress to Date and Plans

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  1. EC-Earth – Copenhagen, Sep. 7/8, 2011Coupling LPJ-GUESS to EC-Earth – Progress to Date and Plans Lund University - Paul Miller, Guy Schurgers, Ben Smith, Almut Arneth KNMI – Philippe Le Sager, Martina Weiss, Bart van den Hurk

  2. Outline • LPJ-GUESS version 2.1 & Motivation • EC-Earth / LPJ-GUESS Coupling – Progress to date • Plans – near term • Plans – long term Goal: quantification and greater understanding of the feedbacks (biogeophysical and biogeochemical) between vegetation and climate at various temporal and spatial scales

  3. LPJ-GUESS ’cohort mode’ resolves plant individuals, canopy vertical structure and patch-scale heterogeneity* Modelled area (stand) 10 ha - 2500 km2 Average individual for plant functional type or species cohort in patch crown area crown area replicate patches in various stages of development leaves leaves LAI LAI leaves / LAI leaves / LAI height height sapwood sapwood sapwood stem stem heartwood heartwood heartwood diameter diameter fine fine 0 0 - - 50 cm 50 cm fine roots fine roots roots roots 50 50 - - 100 cm 100 cm tree grass Patch 0.1 ha *Smith et al. 2001 Global Ecology and Biogeography 10: 621

  4. Dominant Global Vegetation in LPJ-GUESS v2.1 Picea Pinus Larch TeBS Birch TeBE TrBE TrIBE TrBR C3G C4G No Veg Benchmarking datasets for carbon pools & fluxes, water fluxes, vegetation

  5. Hydrological cycle feedbacks in southern and central Europe (summer) - underlying vegetation response CO2 fertilization  LAI increase  Central Europe: E increase  negative T feedback warming/drying  Southern Europe: LAI decrease  E decrease  positive T feedback Change in JJA mean annual open land LAI SCN - CTL RCA-GUESS can be used to identify hotspots of biophysical vegetation -feedbacks – significant locally and seasonally

  6. H-TESSEL Has Vegetation as a Fixed Input Field • Each grid cell has two vegetation types, one high and one low, with specified cover fractions • Based on GLCC data & BATS classification (1km) • 1km raw data is aggregated for various IFS resolutions Source: IFS Documentation Cy36r1

  7. Low and High Vegetation Source: IFS Documentation Cy36r1

  8. Prescribed Vegetation Properties Source: IFS Documentation Cy36r1

  9. Replacing H-TESSEL’s Prescribed Vegetation with LPJ-GUESS Output No_veg C3 GRASS BNS BNE IBS BINE TeBS TeBE C4 GRASS } TROPICAL TREES LPJ-GUESS v2.1 – PFT with Maximum LAI Source: IFS Documentation Cy36r1

  10. OASIS OASIS Offline/coupled set-up coupled offline EC-Earth PreIndustrial (v2.2) (1800-49) CMIP5/RCPs Soil water Soil temp. Precip. 2m Temp SW rad. Snow EC-Earth (IFS/H-TESSEL) V2.3 Compare with default EC-Earth fields 6h Forcing In Future: Canopy Height, Albedo, Water Uptake Fortesting... LPJ-GUESS DUMMY Daily LAI high/low veg LAI LPJ-GUESS v2.1 LPJ-GUESS v2.1 Guy Schurgers & Uwe Fladrich Land use 1 Jan 1850 - Restart

  11. First Offline, (v2.2) PreIndustrial Runs • Use 1840-49 monthly averages of Tair, Tsoil, SW radiation, soil water OR precipitation • Uses same T159 resolution as IFS • Uses soil properties as decribed in Balsamo et al. (2009) • Starts from bare ground and runs for 400 years, for all 9072 land points • ”Low” LAI: No tree PFTs in simulation • ”High” LAI: All PFTs can establish • ”Savestate” on Dec 31, 1849 still being implemented Spinup Natural Vegetation at (45.4 N, 2.5 E) HTESSEL: Interrupted Forest

  12. Tropical and Boreal/Tundra ”High” Tile Vegetation Natural Vegetation at (-5 N, 58.5 W) HTESSEL: Interrupted Forest Natural Vegetation at (65.61 N, 50.4 E) HTESSEL: Evergreen Needleaved Trees

  13. Dominant Vegetation types (“High” Tiles) Boreal/Tundra PFTs • Dominant vegetation from first offline spinup run uses “old” preindustrial spinup data (v2.2) • Dominant vegetation types reasonable nonetheless Temperate PFTs Tropical PFTs Grasses No Vegetation

  14. “High Tile” Annual LAI Fields No Vegetation Tundra Grasses Tropical Vegetation No Vegetation

  15. Carbon Cycle Benchmarks Discrepancy due to, e.g. • LPJ-GUESS spinup too short • Lower pCO2 in 1849 • Biases in ECE output • T159 areas used to uspcale???

  16. IFS LPJ-GUESS onlinecoupling • Status = Coupled !! • LPJ-GUESS uses 15 fields from IFS • Global fields, 6h coupling, T159 • IFS receives but does not use LAIs • Successful 3 year testrun with EC-Earth v2.3 • LPJ-GUESS starts from bare ground • Before distribution • realistic & automatic restart (IFS/NEMO/LPJ-GUESS) • LPJ-GUESS restart files (generated with most recent Preindustrial control run) – no longer bare ground • Thorough testing • practical & unflawed coupling frequency (IFS-NEMO-LPJ-GUESS (TM5?)

  17. EC-Earth & LPJ-GUESS – Next Steps • Produce LPJ-GUESS restart for 01-Jan-1850 • .... And continue the technical testing on ECMWF supercomputers • Use LPJ-GUESS LAI fields in EC-Earth sensitivity tests • Compare runs with ECE soil water and LPJ-GUESS soil water • Add some new shrub PFTs (eg for Australia) • GOAL: first coupled run by end of 2011

  18. EC-Earth & LPJ-GUESSSome Planned Experiments ECE v CRU offline, 1901-2005 – determination of biases Assess sensitivity of EC-Earth to LAI fields from LPJ-GUESS Beyond LAI: sensitivity to new fields, e.g. albedo, canopy height/z0, water uptake etc. Pinatubo experiment – are climate and vegetation anomalies amplified or damped in coupled experiments? Spring and summer droughts

  19. Studying Feedbacks with LPJ-GUESS & EC-Earth (v2.x) EC-Earth PreIndustrial Output, 1800-49 CMIP5/RCPs/Land Use etc. v2.x/v3? EC-Earth (IFS/H-TESSEL/PISCUS) F90 TM5 6h Forcing (17 Fields) N dep, Ozone OASIS OASIS LAI high/low CH4, CO2, BVOC, NOx LPJ-GUESS Version X + OASIS Interface v2.0 LPJ-GUESS 1 Jan 1850 - Restart

  20. Current LPJ-GUESS Development Activity • Coupled Nitrogen-Carbon dynamics • Tropical wetlands • BVOC parameterisation for global PFTs • Land use & agriculture (based on LPJ-mL) • Ozone effects on plants • Global SPITFIRE model parameterisation • Forest management module • Migration module • Reduced timestep (diurnal cycle) • The Gridcell class • Generic OASIS interface

  21. Thank You!

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