Abstract
We consider the problem of projecting future climate from ensembles of regional climate model (RCM) simulations using results from the North American Regional Climate Change Assessment Program (NARCCAP). To this end, we develop a hierarchical Bayesian space-time model that quantifies the discrepancies between different members of an ensemble of RCMs corresponding to present day conditions, and observational records. Discrepancies are then propagated into the future to obtain high resolution blended projections of 21st century climate. In addition to blended projections, the proposed method provides location-dependent comparisons between the different simulations by estimating the different modes of spatial variability, and using the climate model-specific coefficients of the spatial factors for comparisons. The approach has the flexibility to provide projections at customizable scales of potential interest to stakeholders while accounting for the uncertainties associated with projections at these scales based on a comprehensive statistical framework. We demonstrate the methodology with simulations from the Weather Research & Forecasting regional model (WRF) using three different boundary conditions. We use simulations for two time periods: current climate conditions, covering 1971 to 2000, and future climate conditions under the Special Report on Emissions Scenarios (SRES) A2 emissions scenario, covering 2041 to 2070. We investigate and project yearly mean summer and winter temperatures for a domain in the South West of the United States.
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Acknowledgments
Dorit Hammerling had partial support from the NSF Research Network on Statistics in the Atmosphere and Ocean Sciences (STATMOS) through grant DMS-1106862. Bruno Sansó had partial support from grant DMS-1513076. We thank Anthony Tracy for his help with specifying the small sub regions. All the data used in this work is available upon request. Andrew Finley was supported by National Science Foundation (NSF) DMS-1513481, EF-1137309, EF-1241874, and EF-1253225, as well as NASA Carbon Monitoring System grants.
Disclaimer
Although Esther Salazar is a FDA/CTP employee, this work was not done as part her official duties. This publication/presentation reflects the views of the author and should not be construed to reflect the FDA/CTP’s views or policies.
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Salazar, E., Hammerling, D., Wang, X. et al. Observation-based blended projections from ensembles of regional climate models. Climatic Change 138, 55–69 (2016). https://doi.org/10.1007/s10584-016-1722-1
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DOI: https://doi.org/10.1007/s10584-016-1722-1