NEW S AND Notes Pacific Decadal Oscillation Packs a One-Two short fluctuation in the Pacific basin's temperature, Punch Chao also found evidence of another temperature shift that appears to take place on a much longer timescale The Pacific Ocean, the largest and deepest of the of about 70 years. At the beginning of this century, sea world's seven oceans, suffers periodic mood swings surface temperatures seem to gently drop to a low in that have a dramatic impact on our weather. These the 1930s, gradually rise again until the 1970s, and mood swings are a climate phenomenon known as then begin a similarly paced decline to the present. Pacific decadal oscillation (PDO). It is an El Nino-like "While we were only able to see one cycle in our data, shift in the ocean's temperature that scientists once tree-ring records, which go back to 200 to 300 years, thought cycled every 15-20 years. and fishery data show a similar timescale shift," added However, there is new National Aeronautical and Chao. Space Administration (NASA) research that now shows there may be a second, much longer, PDO pat- In Chao's analysis of the past century's sea surface tern that last about 70
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Nov 1, 2000
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