Wednesday, 17 January 2007: 8:30 AM
The impact of the MJO-bridging the gap between weather and climate
214C (Henry B. Gonzalez Convention Center)
The Madden-Julian Oscillation (MJO) is a tropical atmospheric phenomenon, associated with periods of active convection in the eastern hemisphere tropics. The MJO's temporal scale (events happen at intervals from 22-90 days) coincides with a gap between weather and climate forecasts. Application of MJO data begins to address this gap. The RMM Index is an MJO proxy and indicates the amplitude and location (Phases 1-8) of MJO active convection. Analysis demonstrates that the MJO influences weather well beyond the tropics, on this intraseasonal timescale. We analysed global rainfall data (summer/winter rainfall patterns) with respect to the RMM Index phases of the MJO. Observed MSLP frequencies are at least partially explained by the MJO and advance a causal relationship between the tropical MJO and tropical and extra-tropical rainfall and MSLP anomalies.