Post on 22-Jul-2018
The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
CABLE in ACCESS
Rachel Law and the CABLE ‘team’ COECSS annual meeting, November 2013
www.cawcr.gov.au
Impact of CABLE in ACCESS1.3
AMOJ papers: overall comparable behaviour for ACCESS1.0 and 1.3 • Kowalczyk et al:
• Difficulty of attributing 1.0/1.3 differences to land surface model given other model differences,
• warm biases due to underestimation of albedo, (also noted in Bi et al.) • better timing of northern hemisphere snow-melt, • smaller seasonal and diurnal temperature ranges in 1.3
The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
CMIP5 submissions • ACCESS 1.0: ‘HadGEM2’ atmospheric settings including MOSES • ACCESS 1.3: ‘HadGEM3’ settings including PC2 cloud scheme and
CABLE1.8
Examples of post-AMOJ analysis
• Runoff and soil moisture: I Watterson
• ENSO and IOD in 4xCO2 runs: H Rashid
The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
Runoff in mm/day
1.3
1.0
ACCESS 1.1 (atmosphere-only)
• ACCESS 1.0: ‘HadGEM2’ atmospheric settings including MOSES • ACCESS 1.1: ‘HadGEM2’ atmospheric settings and CABLE1.8 • ACCESS 1.3: ‘HadGEM3’ settings including PC2 cloud scheme and
CABLE1.8
The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
Cloud fraction Precipitation
Eva Kowalczyk and Lauren Stevens
Seasonal Mean Screen Temperature Bias (K)
The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
1.0
1.1
1.3
Model
Mean land temp
1.0 8.73
1.1 8.58
1.3 9.15
DJF JJA
Difference (K) from ERAi
E. Kowalczyk & L. Stevens
Seasonal cycle of land screen temperature
The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
Northern high latitudes (66-90N) Northern mid latitudes (23-66N)
Black: 1.0 Red: 1.1 Blue: 1.3 Green: ERAi
E. Kowalczyk and L. Stevens
Diurnal temperature range
• Difference from ERAi (left ~CABLE2.0, right CABLE2.0 with modifications)
The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
Increases in diurnal temperature range in sparcely vegetated regions
E. Kowalczyk & L. Stevens
The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
ACCESS1.4 and ACCESS-ESM1
CABLE2
Trace gases CO2
Atmosphere
Land surface
ACCESS-OM
• ACCESS1.4: Similar to ACCESS1.3 but with CABLE2, OASIS-MCT, revised water balance, tuned dust, sea-ice and ocean fixes • Land carbon fluxes from CABLE2 with biogeochemistry • Ocean carbon fluxes from WOMBAT (World Ocean Model of Biogeochemistry And Trophic-dynamics), includes a two-component plankton model (phytoplankton and zooplankton)
Trace gas fluxes
WOMBAT CICE
Leaf Area Index (LAI) in CABLE
• Expect LAI to vary with vegetation type and season/climate • Prescribed LAI (current): all vegetation types in same grid cell have
same LAI, monthly values for one year used periodically over simulation period
• Prognostic LAI (new): LAI calculated from modelled leaf carbon pool
Prognostic LAI for January (EvNL – Evergreen needle leaf).
T. Ziehn
Land carbon: sensitivity tests
Global land carbon flux to atmosphere Red: prescribed LAI Blue: prognostic LAI Green: nutrient limitation
T. Ziehn and R. Law
Seasonal cycle: 20 year average
The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
North Tropics
South
Red: prescribed LAI (1978-1987) Blue: prognostic LAI (1978-1987) Green: nutrient limitation (1986-2005)
Black: CMIP5 models (1986-2005 from historical run, Anav et al., J. Clim, 2013)
Atmospheric CO2 Concentrations
Seasonal cycle of atmospheric CO2 concentration Solid: Alert (82N) Dotted: Mauna Loa (20N) Black: Observed (GLOBALVIEW-CO2) Green: Prescribed LAI Blue: Nutrient limitation
T. Ziehn and R. Law
Seasonal cycle of NEE (land-air carbon flux)
20 year averages (1986-2005): Mk3L various soil respiration cases and C (blue), CN (green), CNP (red) ACCESS (AMIP): CNP (black)
The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
45-75N 20-45N
20S-20N
J. Exbrayat & R. Law
First tests of ‘interactive CO2’
The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
Atmospheric CO2 – lowest model level Modelled carbon fluxes (PgC/y)
Black: total Green: contribution from land Blue: contribution from ocean
Green: land Blue: ocean
380
330
NB: carbon pools not ‘spun up’
H. Yan, T. Ziehn, M. Chamberlain
New functionality • Land-use change • Lakes • Permafrost • Crops • Soil-Litter-Isotope scheme
New applications • Numerical Weather Prediction • Seasonal Prediction
Future of CABLE in ACCESS
The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
C3 grass
crops
EGBL trees
ACCESS grid-cell N of Lorne
Veg
fract
ion
Technical challenges
• CABLE in UM8.2+ § MOSES → JULES § Work package: Land-surface model interoperability § Martin Best, Matt Pryor (UKMO) visit Feb-Mar 2014 § ACCESS-CM2 (N216, L85) § ACCESS-ESM2 (N96, L85)
• Code management § CABLE repository (NCI) § Tickets § Trac page
The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
https://trac.nci.org.au/trac/cable