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Pacific Decadal Oscillation, October 2001
This page contains archived content and is no longer being updated. At the time of publication, it represented the best available science. However, more recent observations and studies may have rendered some content obsolete.
Like fall and winter of 2000, this years TOPEX/Poseidon satellite data
shows that the Pacific Ocean continues to be dominated by the strong
Pacific Decadal Oscillation, which is larger than the El Niño/La Niña
pattern. The data, taken during a ten-day collection cycle ending Oct.
29, 2001, show that the near-equatorial ocean has been very quiet in the
past year, and sea levels and sea surface temperatures are near normal.
Above-normal sea surface heights and warmer ocean temperatures,
indicated by the red and white areas, still blanket the far western
tropical Pacific and much of the north mid-Pacific. Red areas are about
10 centimeters (4 inches) above normal; white areas show the sea surface
height is between 14 and 32 centimeters (6 to 13 inches) above
In the western Pacific, the buildup of the Pacific Decadal
Oscillation pattern, first noted by TOPEX/Poseidon oceanographers more
than three years ago, has outlasted both the El Niño and La Niña of the
past few years. This warmth contrasts with the Bering Sea, Gulf of
Alaska and the west coast of the United States, where lower than normal
sea surface levels and cool ocean temperatures continue, as indicated by
the blue areas. The blue areas are between 5 and 13 centimeters (2 and 5
inches) below normal, while the purple areas range from 14 to 18
centimeters (6 to 7 inches) below normal.
According to oceanographer Dr. William Patzert of NASAs Jet
Propulsion Laboratory, Pasadena, Calif., the striking similarity between
data taken in 2000 and the same time period in 2001 indicates that
winter weather forecasts for this year will be similar to last year.