Evaluation of the ACCESS Ocean Model Simon Marsland, Dave Bi, Petteri Uotilla, Arnold Sullivan and Katja Lorbacher CAWCR/CMAR, Aspendale CoECSS, Annual Workshop 2012, Hobart 26 September

Overview CoECSS, Annual Workshop 2012, Hobart 26 September 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 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. ACCESS-OM ACCESS 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 coupling code Australia: Matear et al. Ocean Biogeochemistry Australia: CABLE carbon, land surface, and vegetation model

CoECSS, Annual Workshop 2012, Hobart 26 September ACCESS Ocean Model 360x300x50 Levels 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 Coupling system Developed by CERFACS, France Message Passing Interface ACCESS-OM coupling interface Written by Dave Bi at CSIRO Mercator grid in south Tripolar grid in north

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: /2011JC007733, June 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 0.1 Sv Antarctic Meltwater experiment

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, /j.ocemod 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 CoECSS, Annual Workshop 2012, Hobart 26 September 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 Nino-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.

ACCESS-CM CMIP5 Bi et al., subm to AMOJ SST Biases CoECSS, Annual Workshop 2012, Hobart 26 September 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 Units: °C. ACCESS1.0 ACCESS1.3

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

ACCESS-CM CMIP5 Sea Ice Thickness Bias (m) Uotilla et al., subm to AMOJ CoECSS, Annual Workshop 2012, Hobart 26 September GIOMASACCESS1.0ACCESS1.3 march september Mean

ACCESS-CM CMIP5 Sea Ice Thickness Bias (m) Uotilla et al., subm to AMOJ CoECSS, Annual Workshop 2012, Hobart 26 September GIOMASACCESS1.0ACCESS1.3 march september Mean

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

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) 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) 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 Uses the modified NCEP/NCAR re-analysis forcing data (Large and Yeager, 2009)

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

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

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

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

Take Away Message CoECSS, Annual Workshop 2012, Hobart 26 September 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: