"2de06b90-4abe-4c71-a537-978679bf8aea" . "PACIFIC DECADAL OSCILLATION"^^ . "Fisheries scientist Steven Hare coined the term \"Pacific Decadal\nOscillation\" (PDO) in 1996 while researching connections between\nAlaska salmon production cycles and Pacific climate. PDO has since\nbeen described as a long-lived El Nino-like pattern of Pacific\nclimate variability because the two climate oscillations have similar\nspatial climate fingerprints, but very different temporal behavior.\nTwo main characteristics distinguish PDO from El Nino/ Southern\nOscillation (ENSO): first, 20th century PDO \"events\" persisted for\n20-to-30 years, while typical ENSO events persisted for 6 to 18\nmonths; second, the climatic fingerprints of the PDO are most visible\nin the North Pacific/North American sector, while secondary signatures\nexist in the tropics - the opposite is true for ENSO.\nSeveral independent studies find evidence for just two full PDO cycles\nin the past century: \"cool\" PDO regimes prevailed from 1890-1924 and\nagain from 1947-1976 while\"warm\" PDO regimes dominated from 1925-1946\nand from 1977 through (at least) the mid-1990's. Shoshiro Minobe; has\nshown that 20th century PDO fluctuations were most energetic in two\ngeneral periodicities, one from 15-to-25 years, and the other from\n50-to-70 years."^^ . .