CoECSS, Annual Workshop 2012, Hobart 26 September

Overview
• ACCESS Ocean Model
• Evaluation = “to find the value of”
• Papers published (2)
• Papers submitted (10)
• International collaborations (4)
• National collaborations (?)
CoECSS, Annual Workshop 2012, Hobart 26 September

ACCESS = Australian Community Climate and Earth System Simulator
USA: Los Alamos National Laboratory CICE4.0 sea ice code
USA: NOAA/Geophysical Fluid Dynamics Laboratory MOM4p1 ocean code
UK: Met Office Unified Model atmospheric code + UKCA chemistry
France: CERFACS OASIS 3.2.5 coupling code
ACCESS
ACCESS-OM
Australia: CABLE carbon, land surface, and vegetation model
• ACCESS is being developed by the Centre for Australian Weather and Climate Research, a partnership between CSIRO and the Bureau of Meteorology, with Australian universities
• It will deliver national capability in numerical weather prediction, seasonal forecasting, ocean climate modelling, and coupled model climate change simulation.
CoECSS, Annual Workshop 2012, Hobart 26 September

ACCESS Ocean Model
360x300x50 Levels
Mercator grid in south
Tripolar grid in north
• MOM4p1.
NOAA/GFDL Modular Ocean Model (December 2009)
• Primitive equation ocean model
• Geophysical Fluid Dynamics Laboratory, USA
• Community model with world-wide user base
• Generalised orthogonal horizontal coordinates (tripolar)
• z* and p* vertical coordinate systems
• Choice of many physical parameterisation schemes
• Abyssal tides
• Coastal tides
• Submesoscale mixed layer eddies
• Neutral physics
• CMIP5 diagnostic suite
• CICE4.1
LANL sea ice model
• Dynamic-thermodynamic sea ice model
• Los Alamos National Laboratory, USA
• Supports tripolar grids
• Community model with world-wide user base
• OASIS 3.2.5.
Coupling system
• Developed by CERFACS, France
• Message Passing Interface
• ACCESS-OM coupling interface
• Written by Dave Bi at CSIRO
CoECSS, Annual Workshop 2012, Hobart 26 September

Lorbacher, K., S.J. Marsland, J.A. Church, S.M. Griffies, and D. Stammer
Rapid barotropic sea level rise from ice sheet melting,
J. Geophys. Res., 117, C06003, doi:10.1029/2011JC007733, June 2012.
0.1 Sv Antarctic Meltwater experiment
Pacific Islands will feel the effect of Greenland and Antarctic meltwaters much faster than previously claimed.
Requires use of real rather than virtual freshwater fluxes i.e. Have to add the mass!
Linear response of sea level means that mass can be added off-line to interpret studies that use virtual salt fluxes.
CoECSS, Annual Workshop 2012, Hobart 26 September

P. Uotila, S. O ’Farrell, S.J. Marsland, D. Bi,
A sea-ice sensitivity study with a global ocean-ice model
Ocean Modelling, 51, July 2012, 1-18, 10.1016/j.ocemod.2012.04.002.
.
• Sea-ice simulations and extensive tuning
Momentum stress turning angle, ridging parameters, albedos etc.
CoECSS, Annual Workshop 2012, Hobart 26 September summer winter

ACCESS-CM Submissions to Australian
Meteorological and Oceanographic Journal
• Bi et al., ACCESS-OM: the Ocean and Sea ice Core of the ACCESS Coupled
Model.
• Bi et al., The ACCESS Coupled Model: Description, Control Climate and
Evaluation.
• Marsland et al., Evaluation of ACCESS Climate Model ocean diagnostics in
CMIP5 simulations.
• Uotila et al., The sea-ice performance of the Australian climate models participating in the CMIP5.
• Rashid et al., Evaluation of El Nin᷉o-Southern Oscillation in the ACCESS coupled model simulations for CMIP5.
• Dix et al., The ACCESS Coupled Model: Documentation of core CMIP5 simulations and initial results.
• Kowalczyk et al., The land surface model component of ACCESS: description and impact on the simulated surface climatology.
• Rashid et al., Atmospheric circulations in the ACCESS model simulations for
CMIP5: Present-day simulations and future projections.
• Watterson et al., A skill-score based evaluation of simulated Australian climate.
• Sun et al., Modifications in atmospheric physical parameterization aimed at improving SST simulation in the ACCESS coupled-model.
CoECSS, Annual Workshop 2012, Hobart 26 September

ACCESS-CM CMIP5 Bi et al., subm to AMOJ
SST Biases
ACCESS1.0
ACCESS1.3
Figure 14 SST biases of ACCESS1.0 and ACCESS1.3 historical climate. The reference data is the HadISST (Rayner et al. 2003) 30-year observation over
1976-2005. Units: ° C.
CoECSS, Annual Workshop 2012, Hobart 26 September

ACCESS-CM CMIP5 Bi et al., subm to AMOJ
SSS Biases
ACCESS1.0
ACCESS1.3
Figure 16 HIST run present-day annual mean SSS biases
(model – WOA2009 data): a) ACCESS1.0, and b) ACCESS1.3.
Units: psu.
CoECSS, Annual Workshop 2012, Hobart 26 September

ACCESS-CM CMIP5 Sea Ice Thickness Bias (m)
Uotilla et al., subm to AMOJ
GIOMAS ACCESS1.0
ACCESS1.3
march september
1981-2000 Mean
CoECSS, Annual Workshop 2012, Hobart 26 September

ACCESS-CM CMIP5 Sea Ice Thickness Bias (m)
Uotilla et al., subm to AMOJ
GIOMAS ACCESS1.0
ACCESS1.3
march september
1981-2000 Mean
CoECSS, Annual Workshop 2012, Hobart 26 September

ACCESS-CM CMIP5 Sea Ice Extent
Uotilla et al., subm to AMOJ
NSIDC
ACCESS1.0
ACCESS1.3
CSIRO-Mk3.6.0
RCP4.5 (solid)
RCP8.5 (dash)
CoECSS, Annual Workshop 2012, Hobart 26 September

ACCESS-CM CMIP5 Ocean Temperature
Marsland et al., subm to AMOJ
CoECSS, Annual Workshop 2012, Hobart 26 September

ACCESS-CM CMIP5 Sea Level
Marsland et al., subm to AMOJ
CoECSS, Annual Workshop 2012, Hobart 26 September

CLIVAR Working Group on Ocean Model Development
WGOMD Coordinated Ocean-ice Reference Experiments (CORE)
• http://www.clivar.org/organization/wgomd/core
Uses the modified NCEP/NCAR re-analysis forcing data (Large and Yeager, 2009)
• CORE I Normal Year Forcing (NYF)
• Quasi-equilibrium (500 year) experiment with climatological forcing
• Griffies et al., 2009 inter-comparison (7 models)
• Bi et al., 2012, submitted (ACCESS-OM)
• CORE II Inter-annual Forcing (IAF)
• 1948-2007 hindcast experiments
• Danabasoglu et al., 2012 , in prep, AMOC and subpolar gyre variability
• Griffies et al., 2012 , in prep, Can forced ocean models reproduce the thermosteric sea-level change of the late 20 th century?
• Downes et al., 2012 , in prep, Southern Ocean dynamics and ACC
• Treguier et al., 2012 , in prep, South Atlantic variability
• … more to come
CoECSS, Annual Workshop 2012, Hobart 26 September

ACCESS-OM CORE-NYF
Zonal mean Temp (left) and Salt (right) biases
Temperature Salinity
Years 491-500 Mean
CoECSS, Annual Workshop 2012, Hobart 26 September

ACCESS-OM CORE-NYF
SurfaceTemp (left) and Salt (right) biases
SST SSS
Years 491-500 Mean
CoECSS, Annual Workshop 2012, Hobart 26 September

ACCESS-OM CORE-NYF
AMOC (left) and Global Overturning (right)
Atlantic Global
CoECSS, Annual Workshop 2012, Hobart 26 September
Year 491-500 Mean

ACCESS-OM CORE-NYF
Barotropic Streamfunction and DPT (Sv)
CoECSS, Annual Workshop 2012, Hobart 26 September

Take Away Message
• ACCESS-CM submitted to CMIP5
• ACCESS-OM is being used for a variety of science applications
• Collaborations are spinning up with CoECSS
(next talk)
• Plenty of opportunity for building collaboration between CAWCR and CoECSS
Thank you: simon.marsland@csiro.au
CoECSS, Annual Workshop 2012, Hobart 26 September