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HOME > Monitoring and Data > Monitoring Weather & Climate > Indices and Forecasts > Daily MJO Indices
 
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Daily Madden-Julian Oscillation Indices
An extended Empirical Orthogonal Function (EEOF) analysis is applied to pentad velocity potential at 200-hPa for ENSO-neutral and weak ENSO winters (November-April) during 1979-2000. The first EEOF is composed of ten time-lagged patterns . We construct ten MJO indices by regressing the daily data onto the ten patterns of the first EEOF. The figures below show the ten MJO indices (normalized) for the previous 6 and 12 months. Note that the blueish (reddish) color represents the enhanced (suppressed ) convection, and the x-axis labels the centers (20°E, 70°E, 80°E, 100°E, 120°E, 140°E, 160°E, 120°W, 40°W and 10°W) of enhanced convection for the ten indices, which are determined from the ten time-lagged patterns of the first EEOF of CHI200.
MJO Indices
MJO Indices
MJO INDEX 1 2 3 4 5 6 7 8 9 10
LONGITUDE 80°
East
100°
East
120°
East
140°
East
160°
East
120°
West
40°
West
10°
West
20°
East
70°
East
Construction of MJO indices and MJO-related influences.
Archive of MJO indices (1978-present).
Send comments to: Jon Gottschalck (Jon.Gottschalck@noaa.gov)

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Page last modified: January 16, 2003
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