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Title: Regional hydrologic response to climate change in the conterminous United States using high-resolution hydroclimate simulations

Journal Article · · Global and Planetary Change
 [1]; ORCiD logo [1];  [2];  [2];  [2];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Climate Change Science Inst. and Environmental Sciences Division
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Climate Change Science Inst. and Computer Science and Mathematics Division
  3. Purdue Univ., West Lafayette, IN (United States). Dept. of Agronomy

Despite the fact that Global Climate Model (GCM) outputs have been used to project hydrologic impacts of climate change using off-line hydrologic models for two decades, many of these efforts have been disjointed applications or at least calibrations have been focused on individual river basins and using a few of the available GCMs. This study improves upon earlier attempts by systematically projecting hydrologic impacts for the entire conterminous United States (US), using outputs from ten GCMs from the latest Coupled Model Intercomparison Project phase 5 (CMIP5) archive, with seamless hydrologic model calibration and validation techniques to produce a spatially and temporally consistent set of current hydrologic projections. The Variable Infiltration Capacity (VIC) model was forced with ten-member ensemble projections of precipitation and air temperature that were dynamically downscaled using a regional climate model (RegCM4) and bias-corrected to 1/24 (~4 km) grid resolution for the baseline (1966 2005) and future (2011 2050) periods under the Representative Concentration Pathway 8.5. Based on regional analysis, the VIC model projections indicate an increase in winter and spring total runoff due to increases in winter precipitation of up to 20% in most regions of the US. However, decreases in snow water equivalent (SWE) and snow-covered days will lead to significant decreases in summer runoff with more pronounced shifts in the time of occurrence of annual peak runoff projected over the eastern and western US. In contrast, the central US will experience year-round increases in total runoff, mostly associated with increases in both extreme high and low runoff. Furthermore, the projected hydrological changes described in this study have implications for various aspects of future water resource management, including water supply, flood and drought preparation, and reservoir operation.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Organization:
DOE Office of Science (SC); USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1261547
Alternate ID(s):
OSTI ID: 1323998
Journal Information:
Global and Planetary Change, Vol. 143, Issue C; ISSN 0921-8181
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 79 works
Citation information provided by
Web of Science

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Evaluating the relative importance of precipitation, temperature and land-cover change in the hydrologic response to extreme meteorological drought conditions over the North American High Plains journal January 2019
Contribution of environmental forcings to US runoff changes for the period 1950–2010 journal May 2018
Do invasive alien plants benefit more from global environmental change than native plants? journal February 2017
How Will Global Environmental Changes Affect the Growth of Alien Plants? journal November 2016
Climatic and physiographic controls of spatial variability in surface water balance over the contiguous United States using the Budyko relationship: BUDYKO WATER BALANCE MODEL OVER CONUS journal September 2017
Assessment on the Effect of Climate Change on Streamflow in the Source Region of the Yangtze River, China journal January 2017
Sensitivity of seasonal flood simulations to regional climate model spatial resolution journal May 2019
The Dependence of Hydroclimate Projections in Snow‐Dominated Regions of the Western United States on the Choice of Statistically Downscaled Climate Data journal March 2019
Satellite-Based Evapotranspiration in Hydrological Model Calibration journal January 2020
Multi-model Hydroclimate Projections for the Alabama-Coosa-Tallapoosa River Basin in the Southeastern United States journal February 2020

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