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LPJ Status report

HYMN kick-off meeting KNMI, 10 October 2006. LPJ Status report. “When people asked me what I do for a living there would be this awful silence, before I would finally admit: modelling ” Frederique van der Wal (1996). Some features of “standard” LPJ.

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LPJ Status report

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  1. HYMN kick-off meeting KNMI, 10 October 2006 LPJ Status report

  2. “When people asked me what I do for a living there would be this awful silence, before I would finally admit: modelling” Frederique van der Wal (1996)

  3. Some features of “standard” LPJ • “Lund-Potsdam-Jena” => development st Bristol.... • Written in FORTRAN • Dynamic global vegetation model (DGVM) based on a full ecosystem process approach and 11 PFTs • Shortest timestep 1 day • Carbon-water exchange “core” from BIOME3 • Calculates LUE and Vmax from optimization theory • Calculates ET and gs using plant hydraulic limitation and Monteith (1995) CBL parameterization • Interactive fire regime (function of vegetation and climate) • Passive N cycle => no N limitation • Sitch et al. 2003 + Gerten et al. 2004 with improved hydrology

  4. Sitch et al., 2003

  5. Sitch et al., 2003

  6. Sitch et al., 2003

  7. Sitch et al., 2003

  8. Sitch et al., 2003

  9. Sitch et al., 2003

  10. Lucht et al., 2002

  11. Joos et al., 2001

  12. Joos et al., 2005

  13. Comparison to pre-industrial conditions

  14. LPJ-simulated biomass burnt at LGM Thonicke et al. 2004

  15. New developments, 2003 on • Boreal wetlands: PFTs, permafrost, CH4 emissions (Rita Wania, Bristol) • Process-based fire algorithm with regional and global evaluation (Allan Spessa, Reading; Kirsten Thonicke, Bristol) • Fully interactive N cycle, including soil N transformations and associated emissions of NOx, N2O, NH3 (Xu-Ri, CAS-ITP Beijing)

  16. Near-term plans • Consolidated LPJ version release for QUEST palaeo-projects, ENSEMBLES, HYMN, and other applications • Participation in C-LAMP intercomparison project (ORNL) for comprehensive C cycle benchmarking • Developments specific for HYMN: CH4 and H2 soil sinks, smouldering versus blazing fire emissions, variable C:N ratios in biomass, wetland and N2-fixation sources of H2, plant CH4 (??) and isoprene emissions..... • Evaluation of modelled trace gas emissions against observations

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