FIG. 6. (a) Monthly time series of hydroelectric power output (1010 kW h21) in China for the period January 2003 to August 2010 (blue line). The red line shows the corrected time series after removing the multiplicative seasonality and linear trend. The bottom graphic shows the monthly anomalies (in percentage of the mean values for the period 2003–08). Gray shading identifies the drought episode (May 2009–April 2010). (b) As in Fig. 1 but for the period May 2006–April 2007.
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