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Global Coupled model development across timescales CAWCR 9th Annual Workshop, BoM Melbourne, 19−22 October 2015
David Walters, Ed Blockley, John Edwards, Helene Hewitt, Tim Johns, Sean Milton and Keith Williams
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Outline This presentation covers the following areas
• Global Atmosphere development across timescales
• Global coupled model development
• Seasonal-to-climate
• Global coupled NWP
• Global Coupled development across timescales
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Global Atmosphere development across timescales
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© Crown copyright Met Office
Unified forecast/climate model Cullen (1993)
• Common control/infrastructure
• Common grid structure/dynamical core
• Access to common set of parametrisation schemes selected by user
• Common diagnostic/processing code
• Later drive to make model portable across architectures
Global coupled climate Global NWP Mesoscale NWP
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© Crown copyright Met Office
Unifying the Unified Model Synergies between NWP models and GCMs Senior et al. (2010)
Timescale
Resolution
• Long runs to compare NWP models with climatologies
• Many model characteristics
present across all timescales
• Short runs with assimilation to study error growth in climate models
(e.g. Transpose AMIP) UM community well placed to take advantage of these synergies
→ Develop single scientific configuration for use at all timescales
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© Crown copyright Met Office
Global Atmosphere 6.0 UM Global Atmosphere Configuration https://code.metoffice.gov.uk/trac/GA
What is Global Atmosphere/GA6.0?
• Science config. of Unified Model
• Defined set of physics/dynamics settings
• Non-convection permitting resolutions
• Global N96 → Regional 12km?
• Timescales from day 1 to 100s years
• Various system dependent options
• e.g. energy/moisture conservation
• Prognostic vs. clim. Aerosols
• Developed with community of UM
partners and academic collaborators
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© Crown copyright Met Office
Global Land 6.0 JULES Global Land Configuration https://code.metoffice.gov.uk/trac/GL
What is Global Land/GL6.0?
• Science config. of JULES model
• Developed for use with UM GA configs
• Can also be run in offline JULES
• Developed with UM GA developers with
increased input from JULES modelling
community anticipated
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GA6.0/GL6.0 & GA6.1/GL6.1 Combined GA/GL configurations
MOGREPS-G short-range EPS
• LS DA
• Offline JULES
• Run with other components (e.g. ACCESS)
Global/regional deterministic NWP
AMIP-like climate simulations
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Global model development Process design
Model Development Research Cycle
Implementation Cycle
Model Evaluation/Verification
Annual release cycle Multi-year timescales
Operational Implementation/Use
System dependent
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Global model development Typical workflows
Model Development Research Cycle
Implementation Cycle
Evaluation/Verification Development of metrics
Operational Implementation/Use
Bottom-up/general model development
Top 10 problems
Annual release cycle Multi-year timescales System dependent
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© Crown copyright Met Office
GA development Template for the implementation cycle
APP DR
PEGs/WGs WS CS: ESM-CG
Research Cycle Dec: GA/GL
prioritisation
Jan-May: Reporters
rerun std tests
Before end May:
StdTestsReview
Feb/Mar-May:
Science Assurance
Apr-Sep:
Package testing
Oct-Nov:
Final tuning/testing
Dec:
GC freeze
Assessment,
documentation,
implementation
• Ticket open
• Initial tests recorded
(impact and std tests)
• Impact assessed
• Some packaging?
• Discuss changes
ready for next GA/GL
• Prioritisation
• Tickets moved to
appropriate milestone
and priority assigned
• Agree aims and
constraints of next GC
release
• Minimum std tests:
20y AMIP, NWP cases
• When appropriate,
further tests (e.g.
coupled runs, trials …)
• Build up packages of
GA and GL configs
• Std and more
sophisticated tests
(trials, coupled runs,
coupled NWP, LAMS)
• Test with candidate
GO/GSI releases
• Final shake-down of
upcoming release
• Jan-Apr: Full set of
assessment runs
• Apr: Documentation
pages and papers
• June: Assessment
workshop
• Implementation
where appropriate
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Global coupled development Seaonal-to-climate timescales and global coupled NWP
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© Crown copyright Met Office
Global Ocean 5.0 NEMO Global Ocean Configuration https://code.metoffice.gov.uk/trac/GO
What is Global Ocean/GO5.0?
• Science config. of NEMO ocean model
• Defined grid and set of model settings
• Currently uses only ORCA025 resolution
• Developed through UK Joint Ocean
Modelling Programme (JOMP) with
MO/NOC/BAS
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© Crown copyright Met Office
Global Sea Ice 6.0 CICE Global Sea Ice Configuration https://code.metoffice.gov.uk/trac/GSI
What is Global Sea Ice/GSI6.0?
• Science config. of CICE sea ice model
• Developed for use with NEMO GO configs
• Has been run at ORCA025 and ORCA1
• Developed through UK Joint Sea Ice
Modelling Programme (JSIMP) with
MO/CPOM/NOC/BAS
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GO5.0/GSI6.0 Combined GO/GSI configurations
• Run with other ice models
Ocean forecasting
Ocean reanalysis
•Offline CICE
•Could be run with
other oceans (e.g. ACCESS)
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Global Coupled configuration GC2.0 and its components
Decadal Prediction
GloSea seamless EPS
Climate Change studies
Coupled NWP/assimilation
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Global Coupled development across timescales
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Governance of GC process Current situation
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• GA/GL & GC governed by INTEGRATE project
• GO/GSI governed by JOMP/JSIMP
• Initialised coupled runs not used much in development
• Impact of GO/GSI configs on ocean f/c only tested after freeze / assessment
• Loose coordination between GA/GL, GO & GSI
• Role of partners not involved in GC development unclear at some points in process
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Governance of GC process Proposed approach
© Crown copyright Met Office
GC development programme
JOMP
JSIMP
UM consort.
JULES BAU dev activities:
Non-GC users/applications
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Summary
• GA/GL development process bedded in and delivering to users
• Current GC development “bolts on” to GA/GL development process
• Future GC development should better coordinate development of component models but allow each to continue to deliver to non-GC users
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Questions?