Five-century record of climate and groundwater recharge variability in southern California.

Also, the linear trend of the PDO Index (PDOI) calculated over the same time interval of RD-103 shows a decreasing trend (dotted line: PDOI = −0.0007 × year + 1.38) consistent with that observed at RD-103, meaning a reduction of the recharge rate over the investigated time.

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RI values at RD-103 range between −0.89 (1705 to 1719) and +0.80 (1535 to 1539); the analysis of the linear trend shows a negative trend over the analyzed periods (dotted line: RI = −0.0007 × year + 1.32) (Fig. 5a ).

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