The 40–50 Day Oscillation and the El Niño/Southern Oscillation: A New Perspective

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The tropical ocean-atmosphere exhibits two prominent modes of low-frequency oscillations, i.e., the “40–50” day oscillation and the El Niño/Southern Oscillation (ENSO). The two phenomena are viewed in the same perspective from 10 years of satellite-derived outgoing-longwave-radiation data. Results reveal some interesting features that may lead to new insights into the understanding of the two phenomena.

1 Laboratory for Atmospheres, NASA/Goddard Space Flight Center, Greenbelt, MD 20771.

2 Applied Research Corporation, Landover, MD 20785.

The tropical ocean-atmosphere exhibits two prominent modes of low-frequency oscillations, i.e., the “40–50” day oscillation and the El Niño/Southern Oscillation (ENSO). The two phenomena are viewed in the same perspective from 10 years of satellite-derived outgoing-longwave-radiation data. Results reveal some interesting features that may lead to new insights into the understanding of the two phenomena.

1 Laboratory for Atmospheres, NASA/Goddard Space Flight Center, Greenbelt, MD 20771.

2 Applied Research Corporation, Landover, MD 20785.

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