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HOME > Monitoring and Data > Monitoring Weather & Climate > Indices and Forecasts > Daily MJO Indices > MJO-Index AND MJO-Related Influences

Extended Empirical Orthogonal Function (EEOF) analysis is applied to pentad 200-hPa velocity potential (CHI200) anomalies equatorward of 30°N during ENSO-neutral and weak ENSO winters (November-April) in 1979-2000. See CPC ENSO classification .

Ten daily MJO indices are constructed by projecting the daily (00Z) CHI200 anomalies onto the ten time-lagged patterns of the first EEOF of pentad CHI200 anomalies.

Correlation patterns in the table below show the linear impacts of the MJO on oceanic and atmospheric variables in the tropics and subtropics.

200-hPa Velocity Potential Outgoing Longwave Radiation 200-hPa Zonal Wind 850-hPa Zonal Wind 200-hPa Stream Function Sea Level Pressure
CHI200 OLR U200 U850 PSI200 SLP

The values in the correlation patterns are correlations between the anomaly time series at each grid point and the amplitude time series for the first EEOF mode during boreal winter (November-April).

Composites keyed on the convectively active phase of the ten MJO indices show both linear and nonlinear impacts of the MJO on the atmospheric circulation in the global domain.

Outgoing Longwave Radiation 200-hPa Stream Function Precipitation Surface Air Temperature 500-hPa Geopotential Height

The blue (yellow) shading denotes negative (positive) anomalies significant at the 95% level with a 2-tailed student's t test. The shading in the precipiation composites denotes the percentage departure relative to the climatological pentad precipitation based on the Dec-Apr period.

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Page last modified: December 21, 2005
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