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Climate Change Assessment for Water Resources Region 03 <br />South Atlantic -Gulf <br />Yo., <br />Figure 2.9. Summer precipitation anomalies, southeast USA, 1900 — 2000. (Li et al., 2011). <br />Wang and Killick (2013) also investigated both high and low extreme precipitation anomalies, as <br />well as non- stationarity in historical monthly data. These authors targeted 56 watersheds in the <br />southeast U.S., nearly all of which are located in the South Atlantic -Gulf Region. Quantile <br />regression analysis was applied to detect trends in different quartiles of monthly historical <br />precipitation data (1900 — 2009). For the 101' quantile (low precipitation), the vast majority of <br />sites showed no trend at all, while a small number exhibited a negative (decreasing) trend in <br />monthly precipitation (Figure 2.10). For high precipitation months (90'h quantile), approximately <br />20% of the sites showed a significant increasing trend. These results point toward an increasing <br />frequency of extreme storm events. It is also worth noting that non- stationarity in monthly <br />precipitation totals for the same period of record was detected in 8 of the 56 study watersheds. <br />Figure 2.10. Trends in 10" (a) and 90" (b) quantile monthly precipitation, 1900 — <br />2009. The South Atlantic -Gulf Region is within the red oval. (Wang et al., 2013a). <br />USACE Institute for Water Resources 16 January 9, 2015 <br />