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CABLE: the Australian community land surface model. Bernard Pak, Yingping Wang, Eva Kowalczyk CSIRO Marine and Atmospheric Research OzFlux08, Adelaide, 4-6 Feb 2008. Australian Community Climate Earth System Simulator (ACCESS) modelling program. Diagram to right shows ‘scope’

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Cable the australian community land surface model

CABLE: the Australian community land surface model

Bernard Pak, Yingping Wang, Eva Kowalczyk

CSIRO Marine and Atmospheric Research

OzFlux08, Adelaide, 4-6 Feb 2008


Australian community climate earth system simulator access modelling program
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,….)


Interface to the gcm

The general structure of CABLE modelling program

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


Vegetation parameters required for cable
Vegetation parameters required for CABLE modelling program

  • 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


Soil parameters required for cable
Soil parameters required for CABLE modelling program

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


Nonlinear parameter estimation
Nonlinear parameter estimation modelling program

  • 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)



Relative vcmax deciduous forests
Relative Vcmax: deciduous forests modelling program

Leaf growth

Leaf fall


Changes to date
Changes to-date modelling program

  • 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


Future changes
Future changes modelling program

  • 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.


Cable as the australian community land surface model
CABLE as the Australian community land surface model modelling program

  • Source codes and documentation are available to all registered users online at https://teams.csiro.au/sites/cable/default.aspx(email [email protected] to register)

  • We are looking for collaboration to validate/improve CABLE


The end

The End modelling program


Modelling v cmax and j max
Modelling modelling programVcmax and Jmax


Parameter ranges
Parameter ranges modelling program


Observed and estimated v cmax per unit leaf area during growing season m mol m 2 s 1
Observed and estimated modelling programvcmax per unit leaf area during growing season (mmol m-2 s-1)


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