Abstract
The simulations from climate models require bias correction prior to use in impact assessments or when used as predictors in statistical or dynamic downscaling models. Recent works have sought to address each of these limitations and the results are the Multivariate Recursive Nesting Bias Correction (MRNBC) and Multivariate recursive Quantile-matching Nested Bias Correction (MRQNBC) methods. The model was applied to a mountain region of Heihe River. A comparison of the historical and generated statistics shows that the model preserves all the important characteristics of meteorological variables at daily, monthly, seasonally and annual time scales. This study has documented the performance of Multivariate Recursive Nesting Bias Correction to remove the discrepancy between the predictors in the simulated GCM and the reanalysis NCEP data and assess the projected future precipitation accuracy in the headwater region of Heihe River. A relatively high spatial resolution GCM outputs—ACCESS1-3—from the CMIP5 Earth System Models (ESMs) was employed to downscale for the historical 1960–2005 and the future period 2010–2100 under the scenarios of Representative Concentration Pathways RCP4.5 and RCP8.5. The MRNBC method can dramatically increase the performance of the simulated precipitation data. Verified by statistical score metrics applied for evaluation of the results, the developed method appears to be an important statistical tool in the correction of the bias between the GCM output and the reanalysis data, leading to significant improvements in the predictive performance accuracy of the precipitation projections. The projected precipitation under RCP8.5 appeared to exhibit the significant increasing trend relative to the RCP4.5 scenario in the headwater region of Heihe River. Future precipitation will increasing by 8% and 20% for near and long term period under RCP4.5 and increasing 14% and 37% for near and long term period, under RCP8.5, respectively.
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Acknowledgement
This study was supported by the national social sciences foundation: water resources assessment and management system research based on water account in the typical desert oasis of the Silk Road economic belt (17CGL032), Gansu Provincial key research and development foundation: water resource assessment and model demonstration in the typical desert oasis of the Silk Road economic belt (17YF1FA134). The authors also would like to thank the editors and anonymous reviewers for their detailed and constructive comments, which helped to significantly improve the manuscript. The reanalysis data is obtained from the National Center for Environmental Prediction (NCEP) reanalysis provided by the NOAA-CIRES Climate Diagnostics Centre, Boulder, Colorado, USA, from their web site at http://www.cdc.noaa.gov/.
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Handling Editor: Pierre Dutilleul.
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Zhu, Q., Zhao, W. Correcting climate model simulations in Heihe River using the multivariate bias correction package. Environ Ecol Stat 25, 387–403 (2018). https://doi.org/10.1007/s10651-018-0410-x
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DOI: https://doi.org/10.1007/s10651-018-0410-x