1. ACCESS-CM2 Aimed For CMIP6: overview, introduction, and preliminary results (ocean & Sea ice)
Dave Bi, Peter Dobrohotoff, Arnold Sullivan
Ocean and Coupled Modelling Team
CSIRO O&A
Aspendale, Vic 3195
COSIMA 2017 UNSW
May 25, 2017

2. Overview: Features and History of ACCESS-CM2
New Versions of All Components:
Atmosphere: N96 UM10.6/GA7.1 (85 levels, active aerosol)
Land: CABLE2.x (currently Jules)
Ocean: 1-deg MOM5
Sea ice: 1-deg CICE5 (multi-layer)
Coupler: OASIS3-MCT (real parallel coupling)
New Framework/Control System:
Cylc-Rose (“easier” for general users)
History
2014/15 started from ACCESS1.4 framework  Prototype version ACCESS-CM2 (with UM8.6/GA6)
2016 switched to Cylc-Rose  Beta version ACCESS-CM2 (with UM10.3/GA7) [really tough year for CSIRO]
2017 upgraded UM to UM10.6/GA7.1  Official version ACCESS-CM2 (after long waiting……)
Various delays because of strong dependence on collaborators’ delivery, especially the UKMO UM development (GA6GA7GA7.1) and difficult CABLE-UM coupling……
Current Status
Just started tuning (mainly ocean and sea ice) for “acceptable” present day climate simulation
CMIP6 delivery depends on model performance and timing……

3. Rose/Cylc
ACCESS-CM2 Development | Peter Dobrohotoff | Page 3

4. Rose/Cylc
ACCESS-CM2 Development | Peter Dobrohotoff | Page 4

5. Rose/Cylc
ACCESS-CM2 Development | Peter Dobrohotoff | Page 5

6. ACCESS-CM2 Atmosphere: UM 10.x N96 (~130 km) Ocean: MOM5, 1 deg
Sea Ice: CICE5
Coupler: OASIS3-MCT
Atmosphere
Present Day Test
Compute
UM JULES, GA7 - aerosol climatologies
200 yr
532 cores > 4 sim yr / day
UM JULES, GA7.1 - full aerosol scheme
100 yr
532 cores > 3 sim yr / day
UM CABLE, GA7.1 - full aerosol scheme
Next
ACCESS-CM2 Development | Peter Dobrohotoff | Page 6

7. SST time series & SST Bias
ACCESS-CM2 with GA7
ACCESS-CM2 with GA7.1
ACCESS-CM2 with GA7-MAM
ACCESS-CM2 with GA7.1-MAM

8. SON: ENSO and IOD ACCESS-CM2 with GA7 ACCESS-CM2 with GA7.1
Presentation title | Presenter name | Page 8

9. GMOC
ACCESS-CM2 with GA7
ACCESS-CM2 with GA7.1

10. AMOC
ACCESS-CM2 with GA7
ACCESS-CM2 with GA7.1

11. ACC via Drakepassage Present day with GA7 & mom5

12. Sea ice extent climatology
Observation
Present day with GA7 & mom5
Present day with GA7.1 & mom5
Historical with GC3

13. Sea Ice Thickness

14. NH: Ice thickness (AMJ)
ACCESS-CM2 with GA7
ACCESS-CM2 with GA7.1

15. SH: Ice thickness (JAS)
ACCESS-CM2 with GA7
ACCESS-CM2 with GA7.1

16. NH: Ice thickness (JFM)
ACCESS-CM2 with GA7
ACCESS-CM2 with GA7.1

17. SH: Ice thickness (JFM)
ACCESS-CM2 with GA7
ACCESS-CM2 with GA7.1

18. Sea Ice Concentration

19. NH: Ice concentration (AMJ)
ACCESS-CM2 with GA7
ACCESS-CM2 with GA7.1

20. SH: Ice concentration (JAS)
ACCESS-CM2 with GA7
ACCESS-CM2 with GA7.1

21. NH: Ice concentration (JFM)
ACCESS-CM2 with GA7
ACCESS-CM2 with GA7.1

22. SH: Ice concentration (JFM)
ACCESS-CM2 with GA7
ACCESS-CM2 with GA7.1