Introduction to the CSIRO Mk3L climate system model · Introduction to the CSIRO Mk3L climate...
Transcript of Introduction to the CSIRO Mk3L climate system model · Introduction to the CSIRO Mk3L climate...
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Introduction to the CSIRO Mk3L climate
system model
Steven J. Phipps
ARC Network for Earth System Sciences
Tasmanian Partnership for Advanced Computing
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
![Page 2: Introduction to the CSIRO Mk3L climate system model · Introduction to the CSIRO Mk3L climate system model Steven J. Phipps ARC Network for Earth System Sciences Tasmanian Partnership](https://reader035.fdocuments.in/reader035/viewer/2022062912/5d4d4da688c993896d8ba951/html5/thumbnails/2.jpg)
Acknowledgements
• CSIRO Marine and Atmospheric Research
• ARC Network for Earth System Sciences
• APAC, TPAC, iVEC
• Nathan Bindoff
• Bill Budd
• Scott Power
• Jason Roberts
• Tas van Ommen
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
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Overview of workshop
• What is it?
• What can it do?
• Wow, how can I do that?
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
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What is it?
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
![Page 5: Introduction to the CSIRO Mk3L climate system model · Introduction to the CSIRO Mk3L climate system model Steven J. Phipps ARC Network for Earth System Sciences Tasmanian Partnership](https://reader035.fdocuments.in/reader035/viewer/2022062912/5d4d4da688c993896d8ba951/html5/thumbnails/5.jpg)
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
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The CSIRO Mk3L climate system model
• Low-resolution version of the CSIRO climate system model
• Coupled atmosphere-sea ice-ocean general circulation model
• Designed to enable millennial-scale simulations of climate
variability and change
– palaeoclimate reconstructions
– projections of future climate
– detection/attribution
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
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Atmosphere model
• Based on the CSIRO Mk3 atmosphere model
• Spectral general circulation model
• Reduced horizontal resolution of R21 (∆λ ≈ 5.6◦, ∆φ ≈ 3.2◦)
• 18 vertical levels
• Orbital parameter code
• Dynamic-thermodynamic sea ice model
• Land surface model (static vegetation)
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
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Introduction to the CSIRO Mk3L climate system model
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Ocean model
• Based on the CSIRO Mk2 ocean model
• z-coordinate general circulation model
• Same horizontal grid as atmosphere model
• 21 vertical levels
• Gent-McWilliams eddy diffusion
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
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Coupled model
• Surface fields exchanged every one hour (3 atmosphere model
timesteps for each ocean model timestep)
• Coupling rigorously conserves heat and freshwater
• Flux adjustments applied
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
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Source code
• Designed for maximum portability across computer architectures
• Should compile on any UNIX/Linux platform
• Shared-memory parallelism achieved using OpenMP
• Dependence on external libraries restricted to netCDF and
FFTW
• Loop structure optimised for serial architectures
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
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Benchmarks on APAC Facilities
Facility Processor Number of Speed
type processors (years/day)
AlphaServer SC 1GHz EV68 1 4.0
2 7.2
4 11.7
Linux Cluster 2.66GHz Pentium 4 1 4.6
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
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What can it do?
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
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The simulated “present-day” climate
• Control simulation follows PMIP2 experimental design:
– CO2 concentration = 280ppm
– Solar constant = 1365 Wm−2
– “Modern” orbital parameters (AD 1950)
• Ocean model initialised using Levitus 1998
• Atmosphere and ocean models spun up independently
• Coupled model initialised from final states of spin-up runs
• Integrated for 2000+ years
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
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Introduction to the CSIRO Mk3L climate system model
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
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El Nino: model versus observed
Mk3L Observed∗
Standard deviation of 0.48 0.71
Nino 3.4 SST anomaly (◦C)
Average period (years) 7.8 ± 0.5 ∼3–6
Average duration (months) 17.2 ± 0.6 ∼12
∗K. E. Trenberth. The definition of El Nino. The Bulletin of the American
Meteorological Society, 78(12):2771–2777, 1997.
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
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The climate of the mid-Holocene
• Equilibrium simulation conducted for the mid-Holocene (6ka BP)
• PMIP2 experiment
• Orbital parameters for 6ka BP
• Atmospheric CO2 concentration reduced from 280ppm to 277ppm
– equivalent to a reduction in the atmospheric CH4
concentration from 760ppb to 650ppb
• Initialised from year 100 of control simulation
• Integrated for 1200+ years
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
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Introduction to the CSIRO Mk3L climate system model
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Introduction to the CSIRO Mk3L climate system model
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Introduction to the CSIRO Mk3L climate system model
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Introduction to the CSIRO Mk3L climate system model
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Introduction to the CSIRO Mk3L climate system model
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Reconstructed precipitation anomaly over Northern Africa
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
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Introduction to the CSIRO Mk3L climate system model
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El Nino: control versus 6ka BP
Control 6ka BP
Standard deviation of 0.48 0.42
Nino 3.4 SST anomaly (◦C)
Period (years) 7.8 ± 0.5 8.8 ± 0.9
Duration (months) 17.2 ± 0.6 16.6 ± 1.0
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
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The climate of the late Holocene
• Transient simulations from 6,000 years BP to the present day
• Initialised from year 1000 of the mid-Holocene simulation
• Orbital parameters varied, using the acceleration technique of
Lorenz and Lohmann (2004)∗
• Acceleration factors of 1, 5, 10 and 20
• Other boundary conditions unchanged
∗S. J. Lorenz and G. Lohmann. Acceleration technique for Milankovitch type
forcing in a coupled atmosphere-ocean circulation model: method and application
for the Holocene. Climate Dynamics, 23:727–743, 2004.
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Future climate
• Transient simulation in which the CO2 concentration is stabilised
at three times the pre-industrial value
• Initialised from year 100 of control run
• Atmospheric CO2 concentration increased at 1% p.a.
• Reaches 840ppm in year 211, and held constant thereafter
• Other boundary conditions unchanged
• Integrated for 2000+ years
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
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Introduction to the CSIRO Mk3L climate system model
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Introduction to the CSIRO Mk3L climate system model
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
![Page 41: Introduction to the CSIRO Mk3L climate system model · Introduction to the CSIRO Mk3L climate system model Steven J. Phipps ARC Network for Earth System Sciences Tasmanian Partnership](https://reader035.fdocuments.in/reader035/viewer/2022062912/5d4d4da688c993896d8ba951/html5/thumbnails/41.jpg)
Change in zonal-mean ocean temperature (◦C)
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
![Page 42: Introduction to the CSIRO Mk3L climate system model · Introduction to the CSIRO Mk3L climate system model Steven J. Phipps ARC Network for Earth System Sciences Tasmanian Partnership](https://reader035.fdocuments.in/reader035/viewer/2022062912/5d4d4da688c993896d8ba951/html5/thumbnails/42.jpg)
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
![Page 43: Introduction to the CSIRO Mk3L climate system model · Introduction to the CSIRO Mk3L climate system model Steven J. Phipps ARC Network for Earth System Sciences Tasmanian Partnership](https://reader035.fdocuments.in/reader035/viewer/2022062912/5d4d4da688c993896d8ba951/html5/thumbnails/43.jpg)
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etwork for Earth System S
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006
![Page 44: Introduction to the CSIRO Mk3L climate system model · Introduction to the CSIRO Mk3L climate system model Steven J. Phipps ARC Network for Earth System Sciences Tasmanian Partnership](https://reader035.fdocuments.in/reader035/viewer/2022062912/5d4d4da688c993896d8ba951/html5/thumbnails/44.jpg)
Wow, how can I do that?
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Introduction to the CSIRO Mk3L climate system model
CSIRO Mk3L climate system model workshop, UNSW, 25-26 May 2006