Uncertainty of hydrologic processes caused by bias-corrected CMIP5 climate change projections with alternative historical data sources

JOURNAL OF HYDROLOGY

卷:568

Article

Gao, Jungang^1,2  Sheshukov, Aleksey Y.²  Yen, Haw¹  Douglas-Mankin, Kyle R.³  White, Michael J.⁴  Arnold, Jeffrey G.⁴ 

[1] Texas A&M Univ, Blackland Res & Extens Ctr, 720 E Blackland Rd, Temple, TX 76502 USA

[2] Kansas State Univ, Biol & Agr Engn, 1016 Seaton Hall, Manhattan, KS 66506 USA

[3] USDA ARS, Water Management & Syst Res Unit, 2150 Ctr Ave,Bldg D, Ft Collins, CO 80526 USA

[4] USDA ARS, Grassland Soil & Water Res Lab, 808 East Blackland Rd, Temple, TX 76502 USA

关键词: Uncertainty;    Bias correction;    CMIP5;    Climate change;    SWAT;    Streamflow;   

DOI  :  10.1016/j.jhydrol.2018.10.041

来源: Elsevier

【 摘 要 】

Uncertainty in simulating hydrologic response to future climate is generally assumed to result from the combined uncertainties of the General Circulation Model (GCM), representative concentration pathway (RCP), downscaling method, and hydrologic model used. However, another source of uncertainty, the observed climate data source used to statistically downscale and bias-correct GCM projections, has largely been overlooked. This study assessed the shifts, variability, and uncertainty in streamflow simulation from three downscaling data sources (NCDC land-based weather stations, NEXRAD spatial grid, and PRISM spatial grid) relative to those introduced by six GCMs and three RCPs in west-central Kansas, U.S. Streamflow simulated by the Soil and Water Assessment Tool (SWAT) hydrologic model was found to be more sensitive to future precipitation than to maximum and minimum temperatures. The greatest uncertainty in simulated streamflow was associated with selection of the GCM. Uncertainty in simulated streamflow associated with the observed bias-correction data source (NCDC, PRISM, NEXRAD) was greater than with RCPs and was primarily related to uncertainty in precipitation. This study highlighted the importance of recognizing uncertainty from bias-correction data sources in representing future climate scenarios in hydrologic simulations.

【 授权许可】

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