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Dynamical Aspects of Indian Ocean Dipole and East African Rainfall Anomaly Linkages

Journal of Kenya Meteorological Society

(JKMS)

Volume 1:2


Dynamical Aspects of Indian Ocean Dipole and East African Rainfall Anomaly Linkages

Zablone Owiti and L.A. Ogallo

Department of Meteorology, University of Nairobi


Abstract

Space-time characteristics of a series of dynamical parameters were investigated using fields from NCEP/NCAR reanalysis and ECHAM4.5 general circulation model to asses the physical reality of the observed teleconnections between the phases of the IOD and regional rainfall anomalies. Results indicated dominant strong easterly (westerly) wind anomalies over northern and central Indian Ocean during extreme positive (negative) IOD events. The easterly (westerly) wind anomalies have been associated with enhanced (reduced) advection of moisture into the eastern parts of the sub region from Indian Ocean. Climatic conditions that have been shown to be associated with the IOD phases over the region through conventional statistical methods were well captured by the ECHAM4.5 GCM products.

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