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The influence of the Indian Ocean dipole mode on precipitation over the Seychelles
journal contribution
posted on 2023-06-07, 17:23 authored by Aurelie P Harou, Robert F Lajoie, Dominic KnivetonDominic Kniveton, Mick FrogleyMick FrogleyCorrelation and composite analysis are applied to study the atmosphericoceanic mechanisms related to precipitation on the largest island of the Seychelles archipelago, Mahe, in the equatorial western Indian Ocean (EWIO). Significant relationships are found to exist between precipitation and a reversal in zonal wind in the equatorial Indian Ocean (IO), cooler sea surface temperatures (SSTs) in the eastern and southern IO and convergence over Eastern Africa. The observed SST and zonal wind anomalies affecting rainfall in the EWIO are also characteristics of the dipole mode, an Indian Ocean event of internal variability measured by the dipole mode index (DMI). The SeptemberOctoberNovember DMI is significantly correlated to DecemberJanuaryFebruary precipitation in the EWIO, explaining up to 20% of the variance. The analysis suggests an additional influence on variability of rainfall over the EWIO by the sea surface temperatures of the southwest Indian Ocean.
History
Publication status
- Published
Journal
International Journal of ClimatologyISSN
0899-8418External DOI
Issue
1Volume
26Page range
45-54Department affiliated with
- Geography Publications
Full text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2012-02-06Usage metrics
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