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
Overview: Features and History of ACCESS-CM2
Features
New Versions of All Components:
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–
–
–
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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……
Rose/Cylc
ACCESS-CM2 Development | Peter Dobrohotoff | Page 3
Rose/Cylc
ACCESS-CM2 Development | Peter Dobrohotoff | Page 4
Rose/Cylc
ACCESS-CM2 Development | Peter Dobrohotoff | Page 5
ACCESS-CM2
Atmosphere:
Ocean:
Sea Ice:
Coupler:
UM 10.x N96 (~130 km)
MOM5, 1 deg
CICE5
OASIS3-MCT
Atmosphere
Present Day Test
Compute
UM 10.3 + JULES, GA7 - aerosol climatologies
200 yr
532 cores > 4 sim yr / day
UM 10.6 + JULES, GA7.1 - full aerosol scheme
100 yr
532 cores > 3 sim yr / day
UM 10.6 + CABLE, GA7.1 - full aerosol scheme
Next
ACCESS-CM2 Development | Peter Dobrohotoff | Page 6
SST time series & SST Bias
ACCESS-CM2 with GA7
ACCESS-CM2 with GA7-MAM
ACCESS-CM2 with GA7.1
ACCESS-CM2 with GA7.1-MAM
SON: ENSO and IOD
ACCESS-CM2 with GA7
Presentation title | Presenter name | Page 8
ACCESS-CM2 with GA7.1
GMOC
ACCESS-CM2 with GA7
ACCESS-CM2 with GA7.1
AMOC
ACCESS-CM2 with GA7
ACCESS-CM2 with GA7.1
ACC via Drakepassage
Present day with GA7 & mom5
Present day with GA7.1 & mom5
Sea ice extent climatology
Observation
Present day with GA7 & mom5
Present day with GA7.1 & mom5
Historical with GC3
Sea Ice Thickness
NH: Ice thickness (AMJ)
ACCESS-CM2 with
GA7
ACCESS-CM2 with
GA7.1
SH: Ice thickness (JAS)
ACCESS-CM2 with
GA7
ACCESS-CM2 with
GA7.1
NH: Ice thickness (JFM)
ACCESS-CM2 with
GA7
ACCESS-CM2 with
GA7.1
SH: Ice thickness (JFM)
ACCESS-CM2 with
GA7
ACCESS-CM2 with
GA7.1
Sea Ice Concentration
NH: Ice concentration (AMJ)
ACCESS-CM2 with
GA7
ACCESS-CM2 with
GA7.1
SH: Ice concentration (JAS)
ACCESS-CM2 with
GA7
ACCESS-CM2 with
GA7.1
NH: Ice concentration (JFM)
ACCESS-CM2 with
GA7
ACCESS-CM2 with
GA7.1
SH: Ice concentration (JFM)
ACCESS-CM2 with
GA7
ACCESS-CM2 with
GA7.1