Propagating diurnal disturbances embedded in the Madden-Julian Oscillation
Article first published online: 26 SEP 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 18, September 2007
How to Cite
2007), Propagating diurnal disturbances embedded in the Madden-Julian Oscillation, Geophys. Res. Lett., 34, L18811, doi:10.1029/2007GL030480., and (
- Issue published online: 26 SEP 2007
- Article first published online: 26 SEP 2007
- Manuscript Accepted: 24 AUG 2007
- Manuscript Revised: 31 JUL 2007
- Manuscript Received: 24 APR 2007
- diurnal cycle;
- Madden-Julian Oscillation;
- Maritime Continent
 Fine structure of large-scale intraseasonal disturbance associated with the Madden-Julian Oscillation (MJO) was analyzed using the 3-hourly (3B42) TRMM rainfall data. Over the Maritime Continent, diurnal cycle becomes pronounced during the passage of MJO, and the eastward propagating diurnal disturbances (PDDs) dominate as an internal structure of large-scale convection system of MJO. Importantly, fast PDDs that penetrate through the islands are observed within the slowly propagating MJO system. This eastward penetration of PDDs through the islands result in a sudden shift of the convection center from the western part of the islands to the east, causing an overall propagation of the MJO from the Indian Ocean to the Pacific. Our results demonstrate that the diurnal cycle of convection over and around the major islands thus plays an active role in the propagation of the MJO over the Maritime Continent.