a b s t r a c t Study region: Upper Tennessee River Basin, United States. Study focus: The temporal variation of precipitation in the Upper Tennessee River Basin was investigated by utilizing datasets from the Tennessee Valley Authority (TVA) rain gauge network consisting of 56 rain gauges , and the National Weather Service (NWS) analyzing mean areal precipitation values for 78 subbasins . The Mann-Kendall trend test, Mann-Kendall-Sneyers test, Yamamoto Method, and Morlet's wavelet were applied to reveal precipitation trends and abrupt changes in annual precipitation volumes. New hydrological insights for the region: Analyses indicated that: (a) 11% of the 78 subbasins experienced statistically significant increasing or decreasing precipitation over a 50-year period; (b) seasonal precipitation trends based on monthly volumes varied, with the summer and autumn series showing the largest significant increases; (c) abrupt changes in annual precipitation volumes were detected among subbasins corresponding to strong El Niño events; and (d) several subbasins displayed significant periodicities of 1, 6, 18, and 22 years in monthly volumes. These findings provide key information for regional precipitation down-scaling from global climate change models where the Appalachian mountainous terrain greatly impacts down-scaling results.
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