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Daily MJO Indices
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Daily Madden-Julian Oscillation Indices
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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.
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MJO INDEX |
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LONGITUDE
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80°
East |
100°
East |
120°
East |
140°
East |
160°
East |
120°
West |
40°
West |
10°
West |
20°
East |
70°
East |
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