Hydroclimatology of the continental United States

[1] The overall water balance and the sensitivity of watershed runoff to changes in climate are investigated using national databases of climate and streamflow for 1,337 watersheds in the U.S. We document that 1% changes in precipitation result in 1.5–2.5% changes in watershed runoff, depending upon the degree of buffering by storage processes and other factors. Unlike previous research, our approach to estimating climate sensitivity of streamflow is nonparametric and does not depend on a hydrologic model. The upper bound for precipitation elasticity of streamflow is shown to be the inverse of the runoff ratio. For over a century, investigators [Pike, 1964; Budyko, 1974; Ol'dekop, 1911; and Schreiber, 1904] have suggested that variations in watershed aridity alone are sufficient to predict spatial variations in long-term watershed runoff. We document that variations in soil moisture holding capacity are just as important as variations in watershed aridity in explaining the mean and variance of annual watershed runoff.

[1]  R. Vogel,et al.  Regional calibration of a watershed model , 2000 .

[2]  J. Roads,et al.  Large-Scale Aspects of the United States Hydrologic Cycle , 1994 .

[3]  C. Brenninkmeijer,et al.  Assessment of 15N15N16O as a tracer of stratospheric processes , 2003 .

[4]  T. Wigley,et al.  Influences of precipitation changes and direct CO2 effects on streamflow , 1985, Nature.

[5]  Rattan Lal,et al.  Land Use, Land-Use Change and Forestry , 2015 .

[6]  G. Energy.  GCIP : global energy and water cycle experiment (GEWEX), continental-scale international project : a review of progress and opportunities , 1998 .

[7]  R. Vogel,et al.  Annual hydroclimatology of the United States , 2000 .

[8]  P. Milly.  Climate, soil water storage, and the average annual water balance , 1994 .

[9]  J. M. Landwehr,et al.  Hydro-climatic data network (HCDN); a U.S. Geological Survey streamflow data set for the United States for the study of climate variations, 1874-1988 , 1992 .

[10]  W. Russell Hamon.  Estimating Potential Evapotranspiration , 1960 .

[11]  Randal D. Koster,et al.  A Simple Framework for Examining the Interannual Variability of Land Surface Moisture Fluxes , 1999 .

[12]  D. Entekhabi,et al.  Observed Sacramento Basin streamflow response to precipitation and temperature changes and its relevance to climate impact studies , 1996 .

[13]  C. Daly,et al.  A Statistical-Topographic Model for Mapping Climatological Precipitation over Mountainous Terrain , 1994 .

[14]  A. Sankarasubramanian,et al.  Climate elasticity of streamflow in the United States , 2001 .

[15]  M. T. Chahine,et al.  Global Energy and Water Cycle Experiment (GEWEX) , 1994 .

[16]  J. G. Pike.  The estimation of annual run-off from meteorological data in a tropical climate , 1964 .