ACCESS Coupled Model for CMIP5/IPCC AR5 Daohua (Dave) Bi 1 and - - PowerPoint PPT Presentation

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ACCESS Coupled Model for CMIP5/IPCC AR5 Daohua (Dave) Bi 1 and - - PowerPoint PPT Presentation

May 03, 2023 125 likes •372 views

ACCESS Coupled Model for CMIP5/IPCC AR5 Daohua (Dave) Bi 1 and Martin Dix 1 , Maciej Golebiewski 1 , Tony Hirst 1 , Simon Marsland 1 , Siobhan OFarrell 1 , Petteri Uotila 1 , Arnold Sullivan 1 , Zhian Sun 2 , Xiaobing Zhou 2 , Ian Watterson 1

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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

ACCESS Coupled Model for CMIP5/IPCC AR5

Daohua (Dave) Bi1 and Martin Dix1, Maciej Golebiewski1, Tony Hirst1, Simon Marsland1, Siobhan O’Farrell1, Petteri Uotila1, Arnold Sullivan1, Zhian Sun2, Xiaobing Zhou2, Ian Watterson1 Centre for Australian Weather and Climate Research (CAWCR) A partnership between CSIRO and the Bureau of Meteorology

1CSIRO Atmospheric and Marine Research, Aspendale 2Bureau of Meteorology, Melbourne

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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

Outline

1. Introduction to the ACCESS coupled model

  • Framework
  • 2. Performance of ACCESS coupled model in simulating world climate,

especially the world ocean climate

  • Overview: progress in ACCESS coupled model development

Assessment of a few recent runs:

  • Sea Surface Temperature
  • Convection, Overturning and Barotropic Streamfunction
  • Model skill scores in simulating a set of key climatic fields, globally

and over Australia

  • Most recent progress
  • 3. Ongoing work (instead of conclusion)
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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

ACCESS/AusCOM Coupled Model Framework (configuration for IPCC AR5/CMIP5)

Coupler OASIS 3.2.5 Atmosphere UM 7.3 Sea Ice CICE 4.1 Land Surface MOSES or

CABLE 1.4

Ocean MOM4p1

Atmospheric model UM Resolution: 192 x 145 1.875° lon x 1.25° lat 38 levels in the vertical

Ocean Biogeochemistry AusCOM1.0 release Users Guide (Bi, D. and S. Marsland): http://www.cawcr.gov.au/publications/technicalreports/CTR_027.pdf

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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

ACCESS/AusCOM Ocean-Sea Ice Tripolar Grid

Horizontal: Global tripolar with resolution of 360 x 300; Longitudinal: uniform 1°; Latitudinal: Equatorial meridional refinement: 1/3° 10°S-10°N; Mercator grid in Southern Ocean: 1° at 30°S to 0.25° at 78°S. MOM4 and CICE share this horizontal grid. Vertical: 50-level ocean covering 0-6000m with a resolution ranging from 10m (for above 200m column) to 250 m (for the abyssal ocean)

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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

ACCESS/AusCOM Coupling Strategy UM/MATM CICE MOM4 a2i i2a i2o

  • 2i

cpl cpl cpl cpl cpl

  • Different coupling frequencies for

atm ice (3 hours), and ice ocean (every time step, ie, ½ or 1 hr)

  • CICE functions as a ‘coupling buffer’/’media’ between UM and MOM
  • 62 coupling fields (2D): a2i 24, i2o 13, o2i 7, i2a 18
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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011
  • 2. ACCESS Climate Simulations: Basic Assessment

(Test control runs)

ACCESS coupled model has very short history: “assembled” successfully in mid 2009, fully functional since early 2010, and has since then been going through extensive debugging, tuning and re-configuring processes (“slow” but steady progress):

  • UM HadGEM3 setup: Tens of century scale “present” climate control simulations

have been performed over the period from February 2010 to present.

  • UM HadGEM2 setup: a couple of 100-year runs done recently, under debugging...
  • Why TWO versions?

Criteria for assessment (suitable for AR5/CMIP5?):

  • Size of global average SAT or SST (regional) bias and (global) drift.
  • Overall skill in simulating a set of key climatic fields, globally and over Australia.
  • Realism of simulation of the mean state in the tropical Indo/Pacific Ocean region.
  • Realism of simulation of ENSO and influence on Australian rainfall.
  • Realism of polar region sea ice extent.
  • Realism of world ocean circulations, especially SO, including strength of the

Antarctic Circumpolar Current and extent of late winter deep convection.

  • Extent of any other substantial biases evident.
  • ……
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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

Overview of progress in ACCESS coupled model development in the past 12 months (hg3 setup): ‘warming up’ Cooling > 3 °C

test1: 46-level ocean; test2: 50-level ocean; test3: 6hr3hr AI coupling; test4: reduction in ice albedo testx: one of the “cold” runs; testy: cloud inhomogeneous scaling (overtuning) testz: with “proper” cloud scaling parameter

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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

Base-09 Base-10 Base-11 Hg2-5A Hg2-6A C-000

A Few More Recent Runs (hg3 and hg2 setup for UM and various ocean/ice configurations, mostly 200 yrs):

Global ocean T Global ocean S Global SST Global SSS

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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

Base-09 Base-10 Base-11 Hg2-5A Hg2-6A C-000

Global Ocean Overturning Circulations

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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

Barotropic Streamfunction and ACC Transport Through Drake Passage

Sv (106m3s-1)

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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

Ann Max Mixed Layer Depth 10-year Average

hg2 setup runs hg3 setup runs

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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

SST Biases

hg3 setup runs hg2 setup runs

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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

ENSO Spectrum

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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

ACCESS Simulation of key climatic fields (global) (M-skill test for one of the ACCESS hg3 runs)

Ta: SAT; SWg: downward SW at ground; LW↑ & SW↑: upward LW & SW at TOA; Cf: Total cloud radiative forcing; Ct: total cloud cover The mean skill scores across all 9 (global) fields are 0.695, 0.736 and 0.785; Over Australia, scores for these fields are 0.629, 0.685 and 0.814.

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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

The 1st CABLE Run (hg3 setup, with no cloud tuning): Very Promising

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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

CABLE Run: Hope and Issues

MOSES run SST bias (yrs 11~20 avg) CABLE – MOSES (yrs 11~20 avg) CABLE – MOSES (yrs 59~68 avg) Global SST evolution Global MOC yrs 59~68 avg MOSES run CABLE run

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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011
  • 3. Summary and ongoing work
  • ACCESS coupled model is still under development (extensive

testing and tuning still under way);

  • Progress is ‘slow’ but steady, and recent improvement

associated with CABLE implementation shows good potential (but with “bug” to be fixed in CABLE);

  • Code and configuration will be frozen by late June 2011, based
  • n the best performance achieved by then;
  • ‘Formal’ AR5/CMIP5 runs will be performed from July 2011 (in

parallel);

  • Wish for good luck…
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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

Thank you.

Dr Daohua Bi ACCESS Coupled Modeller Centre for Australian Weather and Climate Research CSIRO MAR Aspendale Vic 3199 Email: dave.bi@csiro.au Web: www.accessimulator.org.au

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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

IPCC AR5 timelines

2010 2011 2013 2012

Data after this point will probably not be included in AR5-cited publications CMIP5 continues to accept model results well after IPCC AR5, at least through 2013 Analysis papers for IPCC must be submitted by 31 July 2012 IPCC WG1 final plenary

2014

Model output starts becoming available to users via the ESG

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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

NH Sea Ice Coverage (Base-12c/Base-12b)

NH ice area (106 km2) Base-12c Base-12b

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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

SH Sea Ice Coverage (Base-12c/Base-12b)

SH ice area (106 km2) Base-12c Base-12b

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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

ACCESS Series/Parallel Coupling

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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

Impact of ITF transport on the T.P. cooling

Note Base-02B is implemented with proper Rayleigh drag scheme Which is meant to reduce the water mass (and thus heat) transport From T. Pacific to Indian Ocean through the Lombok Strait, and Therefore reduces the TP cooling bias... Annual Mean SST Diff: Base-02B – Base-02A (years 101-120)

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  • CSIRO. GREENHOUSE 2011, Cairns, April 4-8, 2011

Ice Coverage from HadGEM2 runs

Hg2_15m4 Hg2_15m5 N.H S.H.