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

Thank you

The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

Rachel Law Phone: 03 9239 4427 Email: rachel.law@csiro.au Web: www.cawcr.gov.au/projects/access/cable trac.nci.org.au/trac/cable/wiki

Thank you www.cawcr.gov.au