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Climate Prediction Center - 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.

Additional information is provided in this conference proceedings PDF
MJO Indices 5 Day Running Mean
MJO Indices 15 Day Running Mean
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: Qin Zhang (Qin.Zhang@noaa.gov)

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Page last modified: December 19, 2005
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