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CABLE: Australia's Community Land Surface Model - Advanced Climate and Land Interactions

CABLE (Community Atmosphere Biosphere Land Exchange) is an advanced land surface model developed by CSIRO to effectively simulate climate and environmental processes in Australia. Key priorities include numerical weather prediction and climate change simulations, addressing needs for collaboration among institutions. The model integrates vegetation types, soil parameters, and carbon cycling processes, allowing for accurate predictions of evapotranspiration, carbon fluxes, and nutrient cycling. CABLE is modular, flexible, and regularly updated to enhance climate modeling capabilities.

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CABLE: Australia's Community Land Surface Model - Advanced Climate and Land Interactions

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  1. CABLE: the Australian community land surface model Bernard Pak, Yingping Wang, Eva Kowalczyk CSIRO Marine and Atmospheric Research OzFlux08, Adelaide, 4-6 Feb 2008

  2. Australian Community Climate Earth System Simulator (ACCESS) modelling program • Diagram to right shows ‘scope’ • Fundamentally conceived as a modelling ‘system’ that meets a variety of needs. • Priority needs are: • Numerical weather prediction • Climate change simulation capability • Collaboration between key institutions (Bureau, CSIRO, Australian Universities,….)

  3. The general structure of CABLE SEB & fluxes; for soil-vegetation system: Ef , Hf , Eg , Hg; evapotranspiration Canopy radiation; sunlit & shaded visible & near infra-red, albedo Carbon fluxes; GPP, NPP,NEP stomata transp. & photosynthesis Interface to the GCM soil temp. soil moisture soil respiration snow carbon pools; allocation & flow CASA-CNP vegetation dynamics/disturbance Kowalczyk et al., CMAR Research Paper 013, 2006

  4. Vegetation parameters required for CABLE • VEGETATION TYPE • 1 broad-leaf evergreeen trees • 2 broad-leaf deciduous trees • 3 broad-leaf and needle-leaf trees • 4 needle-leaf evergreen trees • 5 needle-leaf deciduous trees • 6 broad-leaf trees with ground cover /short-vegetation/C4 grass (savanna) • 7 perennial grasslands • 8 broad-leaf shrubs with grassland • 9 broad-leaf shrubs with bare soil • 10 tundra • 11 bare soil and desert • agricultural/c3 grassland • 13 ice Geographically explicit data LAI – leaf area index fractional cover C3/C4 - fraction themodel calculates: z0 – roughness length α – canopy albedo A grouping of species that show close similarities in their response to environmental control have common properties such as: - vegetation height - root distribution - max carboxylation rate - leaf dimension and angle, sheltering factor, - leaf interception capacity

  5. Soil parameters required for CABLE Soil Properties: - water balance: wilting point field capacity saturation point hydraulic conductivity at saturation matric potential at saturation - heat storage: albedo, specific heat, thermal conductivity density - soil depth Soil types: Coarse sand/Loamy sand Medium clay loam/silty clay loam/silt loam Fine clay Coarse-medium sandy loam/loam Coarse-fine sandy clay Medium-fine silty clay Coarse-medium-fine sandy clay loam Organic peat Permanent ice Post, W., and L. Zobler, 2000 Global Soil Types

  6. Nonlinear parameter estimation • 19 FLUXNET sites, including all major veg types in the temperate and subtropical climate; • Uniform parameter range ; • Optimisation was applied to each year’s measurements separately; • Each type of obs was weighted by the SD of measurements over a year. • Published in Wang et al. (Global Change Biology, 2001 and 2007)

  7. A temperate evergreen forest, Tumbarumbra, Australia

  8. Relative Vcmax: deciduous forests Leaf growth Leaf fall

  9. Changes to-date • Major clean-up and rewriting of codes in FORTRAN90 standard, making it more modular and more flexible. • A secured website has been set up for code distribution, installation help and exchange of ideas. • Standard scripts introduced to help analyzing results. • Monthly meeting

  10. Future changes • CASA-CNP: Nitrogen and phosphorus have been found to impact strongly on climate predictions. Such nutrient cycles will be implemented within the current year. It also necessitates a better phenology module. • Dynamic vegetation: a UNSW post-doc (Dr. Jiafu Mao) have just started in January. He will implement LPJ into CABLE. • Hydrology: MU and BoM have done some work, we will have at least one post-doc later this year.

  11. CABLE as the Australian community land surface model • Source codes and documentation are available to all registered users online at https://teams.csiro.au/sites/cable/default.aspx(email bernard.pak@csiro.au to register) • We are looking for collaboration to validate/improve CABLE

  12. The End

  13. Modelling Vcmax and Jmax

  14. Parameter ranges

  15. Observed and estimated vcmax per unit leaf area during growing season (mmol m-2 s-1)

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