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Technical note Some new characteristics of El Nino events

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  • Njau, Ernest C

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.

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  • Njau, Ernest C, 1999. "Technical note Some new characteristics of El Nino events," Renewable Energy, Elsevier, vol. 17(2), pages 243-253.
    • Handle: RePEc:eee:renene:v:17:y:1999:i:2:p:243-253
    DOI: 10.1016/S0960-1481(98)00117-7
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    1. Njau, Ernest C., 1997. "Existence and possible causes of some large-scale changes in temperature patterns," Renewable Energy, Elsevier, vol. 11(4), pages 401-408.
    2. Njau, Ernest C., 1996. "Generalised theory of ENSO and related atmospheric phenomena," Renewable Energy, Elsevier, vol. 7(4), pages 339-352.
    3. Njau, Ernest C., 1998. "Amplitude-modulating periodicities in global and regional heat/temperature variations," Renewable Energy, Elsevier, vol. 13(3), pages 295-303.
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    Cited by:

    1. Njau, E.c, 1999. "Some causes of rapid changes in temperature patterns," Renewable Energy, Elsevier, vol. 18(2), pages 157-166.
    2. Njau, Ernest C, 2000. "New evidence for imminent change in global temperature patterns," Renewable Energy, Elsevier, vol. 20(2), pages 129-134.
    3. Njau, Ernest C., 2005. "Expected halt in the current global warming trend?," Renewable Energy, Elsevier, vol. 30(5), pages 743-752.

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