Technical note Some new characteristics of El Nino events

Ernest C Njau

Renewable Energy, 1999, vol. 17, issue 2, 243-253

Abstract: Except for the seasons, nothing is thought to influence surface-level solar radiation and wind velocity patterns on timescales of up to about a decade as much as El Nino events. Here we report new information about El Nino events by illustratively showing that whenever the mean air temperature T at land-based Dar es Salaam station (6°53′S, 39°12′E) and the mean air temperature Tn over some off-shore equatorial islands in the Indian ocean have similar quasi-regular periods, El Nino events take place at approximately regular frequency patterns. These frequency patterns, however, change whenever Tn and T acquire dissimilar periods. Finally we show that variations in the Southern Oscillation index (whose low negative values and high positive values coincide with El Nino and anti-El Nino events, respectively) were characterised by one particular amplitude-modulating state from 1954 up to about 1987. Moreover these variations switched into a different state about 1987 and have remained in that state ever since. These two states have different time-patterns of El Nino events.

Date: 1999
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:17:y:1999:i:2:p:243-253

DOI: 10.1016/S0960-1481(98)00117-7

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