We thank Julia Flaherty of Pacific Northwest National Laboratory (PNNL) for providing Fig. 1. We also thank Prof. Songyou Hong for the helpful discussion and two anonymous reviewers for their helpful comments and suggestions. This work was supported by the U.S. Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy. The RWP was provided by the DOE's Atmospheric Radiation Measurement Program Climate Research Facility, and the tower anemometer data were provided by the Bonneville Power Administration. A portion of the research was performed using PNNL Institutional Computing. PNNL is operated by Battelle for the DOE under Contract DE-AC06-76RL01830.
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