We are grateful to Lucia Bunge for providing the long-term Niño-3.4 SST index, and to Andrew Wittenberg for making the CM2.1 model simulation available to us. Insightful discussion with Upmanu Lall in a companion study as well as valuable comments from Michael Alexander and two anonymous reviewers are highly appreciated. The MTM statistical package was obtained from Michael Mann’s website: http://www.meteo.psu.edu/~mann/Mann/tools/tools.html. This study was supported by the USDA-CSREES Drought Management, Utah Project, and approved by the Utah Agricultural Experiment Station, Utah State University as journal paper 8233. Support for the 20CR is provided by the U.S. Department of Energy, Office of Science Innovative and Novel Computational Impact on Theory and Experiment (DOE INCITE) program, and Office of Biological and Environmental Research (BER), and by the NOAA Climate Program Office.
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The Great Basin referred to here includes the GSL watershed.
The significance test has taken into account the reduced degree of freedom (DoF) due to filtering. In this case the DoF was reduced to 7 from 157 given the 20-yr cutoff frequency.
The terms “interdecadal” and “multidecadal” are used interchangeably in the text.