Use of models and observations to assess trends in the 1950–2005 water balance and climate of Upper Klamath Lake, Oregon
Article first published online: 12 DEC 2009
Copyright 2009 by the American Geophysical Union.
Water Resources Research
Volume 45, Issue 12, December 2009
How to Cite
2009), Use of models and observations to assess trends in the 1950–2005 water balance and climate of Upper Klamath Lake, Oregon, Water Resour. Res., 45, W12409, doi:10.1029/2008WR007295.(
- Issue published online: 12 DEC 2009
- Article first published online: 12 DEC 2009
- Manuscript Accepted: 26 AUG 2009
- Manuscript Revised: 6 AUG 2009
- Manuscript Received: 18 JUL 2008
- Upper Klamath Lake;
- water balance;
- climate change
 A 1-dimensional surface energy balance model is applied to produce continuous simulations of daily lake evaporation of Upper Klamath Lake, Oregon (UKL) for the period 1950–2005. The model is implemented using observed data from land-based sites and rafts collected during 2005–2006. Progressively longer, temporally overlapping simulations are produced using observed forcing data sets from sites near UKL. Simulation of the entire 56 years is accomplished using forcing data derived from weather station data and a 1949–2007 regional climate simulation over western North America. Simulated mean annual evaporation for 1950–2005 is 1073 mm. The simulated evaporation estimates are an improvement over existing May–September pan-derived estimates because the latter are not representative of annual evaporation rates and do not span the multidecadal period of interest over which climate-driven interannual (and longer) variability is evident. Evaporation and the other components of the water balance display statistically significant trends over the past 56 years that are associated with changes in meteorological forcing over the lake and the radiative and moisture balances at higher elevations of the catchment. Trends in the basin are consistent with and imbedded in regional and hemispheric climate trends that have occurred over the last century.