Recent ENSO-PDO precipitation relationships in the Mediterranean California border region.

The Mediterranean California Border Region ( MCBR) rainfall's relationship with El Niño-Southern Oscillation ( ENSO) and the Pacific Decadal Oscillation ( PDO) is reexamined for the period 1951-2014. When stratifying data by ENSO events we found that strong events of either sign yield the highest ENSO-rainfall correlation; but when the stratification was done by rainfall the wet seasons yield the highest ENSO-rainfall correlation. Most strong ENSO events have the same sign as PDO; but the ENSO-rainfall correlation for all ENSO-PDO same-sign events is almost undistinguishable from the full-record's correlation. Timewise stratification shows that 30-year climatological values ( MCBR precipitation, PDO and ENSO) and ENSO-rainfall correlations have decreased in recent years. [ABSTRACT FROM AUTHOR]