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Amplitude-modulating periodicities in global and regional heat/temperature variations

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  • Njau, Ernest C.

Abstract

Being one of the major factors influencing global heat energy content in the surface-atmosphere system, global air temperature is studied and the dominating periodicities therein obtained. It is established that since 1856, variations in global air temperature have been dominantly amplitude-modulated by an oscillation whose period is about 105 years. This oscillation, which is of solar origin, is apparently largely responsible for the ongoing warming trend at global level. Analysis of air temperature records from individual regions yields different dominant periodicities for the two hemispheres. While temperature variations in many parts of the northern hemisphere are dominantly amplitude-modulated by an oscillation at a period of ≈ 180 years, corresponding variations in many parts of the southern hemisphere are dominantly amplitude-modulated by an oscillation at a period of ≈ 55 years. Both of these oscillations are apparently of solar origin.

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  • Njau, Ernest C., 1998. "Amplitude-modulating periodicities in global and regional heat/temperature variations," Renewable Energy, Elsevier, vol. 13(3), pages 295-303.
    • Handle: RePEc:eee:renene:v:13:y:1998:i:3:p:295-303
    DOI: 10.1016/S0960-1481(98)00005-6
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    References listed on IDEAS

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    1. Njau, Ernest C., 1997. "Climatic switches," Renewable Energy, Elsevier, vol. 10(1), pages 1-9.
    2. Njau, Ernest C., 1994. "Predictability of wind speed patterns," Renewable Energy, Elsevier, vol. 4(2), pages 261-263.
    3. Njau, Ernest C., 1996. "Generalised theory of ENSO and related atmospheric phenomena," Renewable Energy, Elsevier, vol. 7(4), pages 339-352.
    4. Njau, Ernest C., 1995. "Expressions for wind speed, relative humidity, rainfall, absolute humidity, vapour pressure and dew point as functions of temperature," Renewable Energy, Elsevier, vol. 6(1), pages 23-28.
    5. 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.
    6. Ododo, J.C. & Sulaiman, A.T. & Aidan, J. & Yuguda, M.M. & Ogbu, F.A., 1995. "The importance of maximum air temperature in the parameterisation of solar radiation in Nigeria," Renewable Energy, Elsevier, vol. 6(7), pages 751-763.
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    1. Njau, Ernest C, 2000. "New evidence for imminent change in global temperature patterns," Renewable Energy, Elsevier, vol. 20(2), pages 129-134.
    2. Njau, Ernest C, 1999. "Technical note Some new characteristics of El Nino events," Renewable Energy, Elsevier, vol. 17(2), pages 243-253.
    3. Njau, Ernest C, 1999. "How anthropogenic activities influence terrestrial heat/temperature patternsfn2fn2An invited paper presented at the international conference on Current Research Trends in the field of Renewable Energy," Renewable Energy, Elsevier, vol. 17(3), pages 319-338.
    4. Njau, E.c, 1999. "Some causes of rapid changes in temperature patterns," Renewable Energy, Elsevier, vol. 18(2), pages 157-166.
    5. Njau, Ernest C., 2000. "Some new relationships between temperature variations and sunspot cycles—2. Short-period variations," Renewable Energy, Elsevier, vol. 19(4), pages 565-577.
    6. Njau, E.c, 1999. "Some new relationships between temperature variations and sunspot cycles—1. Long-period variations," Renewable Energy, Elsevier, vol. 18(1), pages 25-33.

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