LPJLund Potsdam Jena Vegetation Model

1
LPJ-Lund Potsdam Jena Vegetation Model

• Simulates vegetation dynamics,hydrology,soil
  organic matter dynamics on an area-averaged
  grid-cell basis with a 1-year timestep
• Includes fire dynamics
• Inputs
• Soils CRU global soils dataset 9 types inc
  coarse-fine range
• Climate CRU 0.5 degree x 0.5 degree 1901-2002
  times series (CRU TS 2.10)
• CO2 provided for 1901-1998 updated to 2002 from
  CDIAC
• Spin-up period of 1000 years to develop
  equilibrium vegetation and soil structure at
  start of simulation
• Thanks
• LPJ code- Ben Smith (Lund), Stephen Sitch (PIK)
• CRU data- David Viner (CRU)

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LPJ- Carbon fluxes
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LPJ-Dominant PFT
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LPJ- Carbon fluxes 1901 and 2002
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Plans for LPJ

• Run LPJ for two or more regions e.g. Western
  Europe, East Africa
• Multiple simulations that account for monte carlo
  sampling of climate input distribution
• Hoping that is feasible- how many simulations?
  500-1000?
• What do we do with the output? Construct
  distributions?

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Climate data

• Use future climate scenarios from IPCC 4th
  assessment (have user account)
• Global scenarios of projections of Temperature,
  Precipitation and Solar Radiation
• 6-9 state of the art GCMs
• 4 emission scenarios A1,A2,B1,B2- all equally
  probable
• Extension of Tebaldi
• Then form 1 probability distribution for all 3
  climate input parameters- sample from that to run
  LPJ