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Annual hydroclimatology of the United States A. Sankarasubramanian

Summary: Annual hydroclimatology of the United States
A. Sankarasubramanian
International Research Institute for Climate Prediction, Lamont-Doherty Earth Observatory, Columbia University, Palisades,
New York, USA
Richard M. Vogel
WaterSHED Center, Department of Civil and Environmental Engineering, Tufts University, Medford, Massachusetts, USA
Received 13 April 2001; revised 21 January 2002; accepted 21 January 2002; published 25 June 2002.
[1] An overview of the annual hydroclimatology of the United States is provided. Time
series of monthly streamflow, temperature, and precipitation are developed for 1337
watersheds in the United States. This unique data set is then used to evaluate several
approaches for estimating the long-term water balance and the interannual variability of
streamflow. Traditional relationships which predict either actual evapotranspiration or the
interannual variability of streamflow from an aridity index f PE=P are shown to
perform poorly for basins with low soil moisture storage capacity. A water balance model
is used to formulate new relationships for predicting actual evapotranspiration and the
interannual variability of streamflow. These relationships depend on both the aridity index
f PE=P and a new soil moisture storage index. A physically based approach for
estimating the soil moisture storage index is introduced which requires monthly time
series of precipitation, potential evapotranspiration, and an estimate of maximum soil
moisture holding capacity. The net results are improved expressions for the long-term


Source: Arumugam, Sankar - Department of Civil, Construction, and Environmental Engineering, North Carolina State University


Collections: Environmental Sciences and Ecology; Engineering