6C.2
The Madden-Julian oscillation and Southern Hemisphere circulation anomalies during southern summer.
Adrian J. Matthews, University of East Anglia, Norwich, Norfolk, United Kingdom
A lifecycle of the Madden-Julian oscillation (MJO) is constructed from an EOF analysis of 24 southern summers of satellite-measured outgoing longwave radiation data from 1974-97. Corresponding circulation anomalies are calculated from NCEP-NCAR reanalyses and MSU temperature data. The eastward shift of the MJO convective anomalies from the Australian region to the South Pacific convergence zone is consistent with a subtropical Rossby wave propagation mechanism. Extratropical circulation anomalies show a pronounced standing oscillation. Rossby wave diagnostics and baroclinic model integrations are used to interpret these observations.
Session 6C, Intraseasonal Oscillations in the Southern Hemisphere (Parallel with Sessions 6a and 6b)
Monday, 5 April 1999, 8:30 AM-10:30 AM
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