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Current Status and Strategy of CGCM and Ocean Analysis System Developments in Australia

This article discusses the current status and strategy of the Centre for Australian Weather and Climate Research (CAWCR) in partnership with CSIRO and the Bureau of Meteorology. It covers the latest system POAMA-2, ocean assimilation, forecast skill, intercomparison with other models, and the upcoming system POAMA-3/ACCESS.

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Current Status and Strategy of CGCM and Ocean Analysis System Developments in Australia

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  1. Current status and strategy of CGCM and ocean analysis system developments in Australia Oscar Alves and the POAMA Team CAWCR (Centre for Australian Weather and Climate Research) Australian Bureau of Meteorology The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  2. Plan • Introduction • Latest system POAMA-2 • Whats new • Ocean assimilation • Forecast skill SST, Rainfall, etc • Intercomparison with other models (e.g. EC, UKMO) • Multi-week prediction • Next system POAMA-3/ACCESS • Summary The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  3. POAMA-2 (Ocean Ensemble KF + similar coupled model) Development Re-analysis and hind-casts Evaluation and Applications POAMA-3 (Coupled assim-EnKF, New Coupled model based on UKMO atmos) Development (Coupled model, assimilation, ensemble gen, qc, etc) Re-analysis and hind-casts Summary/Future 2007 2008 2009 2010 2011 POAMA-1.5 Re-anal + hind-casts Evaluation + Applications Operational Operational The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  4. POAMA-2 - What’s New POAMA-1.5 POAMA-2 BAM-3 + ACOM2–Pseudo Multi Model: A: standard B: with SST bias correction C: with dual shallow convection BAM-3 + ACOM2 (Dual shallow convection) Model Old Smith Optimum Interpolation Temperature Profiles PEODAS – Pseudo EnKF Temperature + Salinity Profiles (Multivariate) Ocean Assimilation Atmos/Land Initialisation ALI – nudging to ERA-40 Same Ensemble Generation Lagged atmospheric IC Ocean pert from PEODAS EnKF The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  5. 1980 onwards 10-member per month 1960 onwards 30 member per month (3x10) Hind-casts Real-time forecasts 30 member multi model on 1st and 15th of month (as hind-casts) 30 member daily Lagged ensemble Ensemble Generation Ocean pert from PEODAS EnKF (as hind-casts) Lagged atmospheric IC POAMA-2 - What’s New 2 POAMA-1.5 POAMA-2 1979-present NCEP forcing BMRC obs 1959-Present ERA-40 forcing UKMO ENACT obs Re-analysis (ALI & PEODAS) The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  6. Why multi-model Example – impact of bias correction The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  7. SST Bias at 4 month Lead Non-bias corrected POAMA2 Bias corrected POAMA2 Produced by Eun-Pa Lim

  8. IOD Anomaly Correlation NINO-3 Anomaly Correlation IOD Anomaly Correlation Multi-model a+b+c Bias corrected Produced by Li Shi

  9. Obs JJA rainfall correlation with NINO3 index Wrong sign of the teleconnection intensifies as lead time increases Non-bias corrected Bias corrected Produced by Eun-Pa Lim

  10. Ocean Assimilation The new PEODAS Pseudo EnKF The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  11. PEODAS: POAMA Ensemble Ocean Data Assimilation System (Yin et al 2010) Pseudo Ensemble Kalman Filter – (Based on extension of BLUElink system) 3D Multivariate ocean assimilation Temperature and Salinity profiles Re-analysis from 1960-present Produces an ensemble of 11 states (pseudo breeding like NCEP) The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  12. Comparison with POAMA-1 POAMA-1 PEODAS System Optimum Interpolation Pseudo EnKF Covariances 2D Univariate Static 3D Multi-variate Time-evolving Observations Temperature profiles from BoM Temperature and salinity profiles from EU ENACT Forcing NCEP Re-analysis ERA-40 Re-analysis Bias Correction 3D relaxation to Levitus None Re-analysis 1960-present 1980-present The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  13. Example Ensemble Spread (Used as model perturbations) Temperature Salinity From Yin et al 2010 The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  14. Correlation between re-analysis and UKMO EN3 dataset Heat Content Salt Content Produced by Maggie Zhao The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  15. Comparison with Other Centres Correlation with “Observations” Heat Content Surface Current PEODAS ECMWF Produced by Maggie Zhao The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  16. ENSO Composite Heat Content Produced by Li Shi The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  17. ENSO Composite Heat Content Surface Salinity PEODAS ECMWF NCEP Produced by Li Shi The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  18. Observation distribution Pre-Argo During-Argo Produced by Yonghong Yin The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  19. Salinity pre-Argo: impact cross-covariances IOD Skill at 2 Month Lead Produced by Li Shi The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology Produced by Robin Wedd

  20. Salinity pre-Argo: impact on mean state IOD Skill at 2 Month Lead Produced by Robin Wedd The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  21. Impact of Assimilation on Heat Skill Correlation in Tropics POAMA-2 (3 models) No Assim POAMA-1.5 Produced by Maggie Zhao The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  22. Impact of Assimilation on Salt Content Skill Correlation in Tropics No Assim POAMA-2 (3 models) POAMA-1.5 Produced by Maggie Zhao The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  23. SST Skill El Nino and IOD (& Comparison with other models) Mostly Based on hind-casts from ~1982-2006 The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  24. Produced by Li Shi The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  25. IOD Skill at 2 Month Lead Produced by Li Shi The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  26. Rainfall Skill The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  27. POAMA-2 MME ECMWF POAMA-2 +EC+UKMO SON Skill lead 1 POAMA-1.5 The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology Produced by Eun-Pa Lim

  28. Brier Skill Score for SE (lead 1 month) The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology Produced by Sally Langford

  29. Lead 4 month UK ec EC teleconnections not so good Brier Skill Score for SE Lead 1 month ec poama UK The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology Produced by Sally Langford

  30. POAMA-2 Multi-Week Need – generate atmospheric perturbed initial conditions Coupled breeding scheme about POAMA-2 Initial Conditions 30-member forecast every Sunday using POAMA-2 model Operational first half of 2011 Coupled breeding – using coupled model Nudge PEODAS + ALI states The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  31. POAMA-3/ACCESS • Model Features • Based on the New ACCESS coupled model (UKMO UM + MOM4 + CICE+CABLE) • Resolution tbd between N96 and N144, L~38-80, depending on supercomputing • Preliminary version in 2011 with limited hind-casts (N96L38, not CABLE, not tuned, simple initialisation e.g. SST nudging) • Challenge – improve model simulation (physics) • Initialisation Features • Full coupled initialisation (coupled PEODAS) with cross-covariances and implicit breeding • Progress through a series of incremental stages starting with coupled SST nudging in 2011 • First system will be for multi-week (cheaper) The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

  32. Summary • POAMA-2 Based on Pseudo-multi model • New real-time strategy – 30 members on 1st and 15th of month • Assimilation significant improvement - PEODAS • Modest improvement in skill and reliability (more complete evaluation to be done) • Internationally competitive – (especially due to assimilation system) • Potentially modest improvement in skill from incorporating EC & UK models into multi model ensemble • Intercomparison with other models suggest all models have issues – potential for significant skill enhancement through model improvement • Dedicated multi-week component first half of 2011 • Focus now on dev. of POAMA-3 based on ACCESS/UKMO UM & Coupled EnKF The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology

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