QJ Wang and Andrew Schepen LAND AND WATER CBaM for post-processing seasonal climate forecasts.

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Presentation transcript:

QJ Wang and Andrew Schepen LAND AND WATER CBaM for post-processing seasonal climate forecasts

Seasonal streamflow forecasting Page 2 Water management needs Ensemble time series forecasts to long lead times Forecasts to be as skilful as possible and reliable Most skill from initial catchment condition Additional skill from climate forecasts Reliability as well as skill important

Need to post-process GCM forecasts Page 3 Biases – unconditional and conditional Ensemble spread - unreliable Forecast skill – generally low, sometimes negative Mismatch in scale for hydrological applications

Available post-processing methods Page 4 Mean correction Multiplicative mean correction Quantile-quantile mapping Ensemble regression Model output statistics

CBaM for post-processing GCM forecasts C alibration B ridging and M erging

CBaM was developed to Page 6 Remove bias from GCM forecasts Improve ensemble spread and reliably represent forecast uncertainty Remove negative skill Improve spatiotemporal coverage of positive skill Combine forecasts from multiple GCMs Downscale forecasts

Extensively evaluated Page 7 Precipitation, maximum and minimum temperatures Monthly and seasonal resolutions Zero to long-lead times Continental and catchment scales POAMA2.4, ECMWF Sys4, NOAA CFS2 Australia and China

Evaluations published Page 8 Schepen, A., Q. J. Wang, and Y. Everingham (In Press): Calibration, bridging and merging to improve GCM seasonal temperature forecasts in Australia. Monthly Weather Review, 142, Schepen, A., Q. J. Wang, and D. E. Robertson, 2014: Seasonal forecasts of Australian rainfall through calibration and bridging of coupled GCM outputs. Monthly Weather Review, 142, Schepen, A., and Q. Wang, 2014: Ensemble forecasts of monthly catchment rainfall out to long lead times by post-processing coupled general circulation model output. Journal of Hydrology, Peng, Z., Q. J. Wang, J. C. Bennett, A. Schepen, F. Pappenberger, P. Pokhrel, and Z. Wang, 2014: Statistical calibration and bridging of ECMWF System4 outputs for forecasting seasonal precipitation over China. Journal of Geophysical Research - Atmospheres, 119, 2013JD Hawthorne, S., Q. J. Wang, A. Schepen, and D. Robertson, 2013: Effective use of general circulation model outputs for forecasting monthly rainfalls to long lead times. Water Resources Research, 49,

Calibration Calibration forecastRaw GCM output BJP

Bridging Bridging forecast GCM SSTs BJP

Merging Bayesian Model Averaging (Wang et al. J of Climate, 2012)

Computing implementation BJP core implemented in Fortran CBaM software implemented in Python Data handling Model running Cross-validation and verification Page 12

Recent applications POAMA 2.4, ECMWF Sys4, NOAA CFS2 Seasonal rainfall, Tmin, Tmax 1 month lead time 2.5 degree grid across Australia 1983 – 2010 Leave 1-year-out cross-validation BJP models BMA weights Page 13

Improvement to reliability (POAMA2.4) Raw mean- corrected Page 14 CBaM post- processed TminTmax Rainfall

CRPS skill score – POAMA 2.4 rainfall Page 15 CBaM calibration Raw (mean-corrected)

CRPS skill score – POAMA 2.4 rainfall Page 16 CBaM calibration + bridging Calibration (CBaM)

CRPS skill score – POAMA 2.4 Tmin Page 17 Raw (mean-corrected) CBaM calibration

CRPS skill score – POAMA 2.4 Tmin Page 18 CBaM calibration CBaM calibration + bridging

CRPS skill score – POAMA 2.4 Tmax Page 19 Raw (mean-corrected)CBaM calibration

CRPS skill score – POAMA 2.4 Tmax Page 20 CBaM calibration CBaM calibration + bridging

Improvement to reliability (CFS2) Raw mean- corrected Page 21 CBaM post- processed TminTmax Rainfall

CRPS skill score – CFS2 rainfall Page 22 Raw (mean-corrected) CBaM calibration + bridging

CRPS skill score – CFS2 Tmin Page 23 Raw (mean-corrected) CBaM calibration + bridging

CRPS skill score – CFS2 Tmax Page 24 Raw (mean-corrected) CBaM calibration + bridging

Bridging improves skill for multiple GCMs Page 25

CBaM can make skill similar – NDJ Tmax Page 26 Calibration CBaM calibration + bridging Raw (mean-corrected)

CBaM forecasts for streamflow forecasting Page 27

Summary - CBaM Page 28 Calibration leads to fully reliable forecasts Calibration improves skill; removes negative skill Calibration is an essential step Bridging augments skill in many regions and seasons CBaM may be used for combining multiple GCMs Useful for both large scale and catchment scale applications

Work in progress The method of ensemble link functions Using all ensemble members Allowing for non-exchangeable members (forecasts/hindcasts of different lead-times) Allowing data to decide information content of ensemble spread in representing uncertainty Page 29

Thank you Q.J. Wang – Senior Principal Research Scientist Andrew Schepen – Research Scientist LAND AND WATER FLAGSHIP