Spatial and Temporal Rainfall characteristics Over Seychelles

M DRININDAJOSEPH. "Spatial and Temporal Rainfall characteristics Over Seychelles.". In: International Journal of Climatology. JOURNAL OF KENYA METEOROLOGICAL SOCIETY; 2010.


While Seychelles lies close to the Equator, it experiences only one
rainy season. The rainfall characteristics over this region is evident from the
Satellite observations which show that during most part of the year the active
clouds are concentrated to the eastern sector of the equatorial Indian Ocean
and Seychelles comes under active weather only during southern hemisphere
summer. The main objective of this study was to therefore investigate the spatial
and temporal characteristics of rainfall over Seychelles during the rainy
season. The specific objectives included demarcating Seychelles into rainfall
homogeneous zones, identify the rainfall season, determine the onset and cessation
of the rainy season. The data used in the study were the daily and
monthly rainfall over Seychelles for the period 1972 to 2006 and NCEP reanalysis
data. The methods used to analyze these data were Principal Component
Analysis (PCA), time series analysis, pentad and cumulative curves.
The results from PCA analyses showed that Seychelles may be divided
into four rainfall homogeneous zones. The study also shown that the rainfall
season occur between November and March. January was observed to be the
peak rainfall month, while July has the lowest amount of rainfall. The onset
and cessation of the rainy season occur in the month of November and March
respectively. Analysis of the low level flow showed the Near Equatorial
Trough (NET) is the main system influencing rainfall over the Seychelles region.
During the time of maximum rainfall in January, the Inter-Tropical Convergent
Zone (ITCZ) lies far to the south of the country




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