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On validation of the rain climatic zone designations for Nigeria

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Abstract

In this paper, validation of rain climatic zone classifications for Nigeria is presented based on global radio-climatic models by the International Telecommunication Union-Radiocommunication (ITU-R) and Crane. Rain rate estimates deduced from several ground-based measurements and those earlier estimated from the precipitation index on the Tropical Rain Measurement Mission (TRMM) were employed for the validation exercise. Although earlier classifications indicated that Nigeria falls into zones P, Q, N, and K for the ITU-R designations, and zones E and H for Crane’s climatic zone designations, the results however confirmed that the rain climatic zones across Nigeria can only be classified into four, namely P, Q, M, and N for the ITU-R designations, while the designations by Crane exhibited only three zones, namely E, G, and H. The ITU-R classification was found to be more suitable for planning microwave and millimeter wave links across Nigeria. The research outcomes are vital in boosting the confidence level of system designers in using the ITU-R designations as presented in the map developed for the rain zone designations for estimating the attenuation induced by rain along satellite and terrestrial microwave links over Nigeria.

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Authors and Affiliations

  1. Department of Electrical & Electronic Engineering, Osun State University, Osogbo, Nigeria

    O. O. Obiyemi

  2. Department of Electrical & Electronics Engineering, University of Ilorin, Ilorin, Nigeria

    T. S. Ibiyemi

  3. Department of Physics, Federal University of Technology, Akure, Nigeria

    J. S. Ojo

Authors
  1. O. O. Obiyemi
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  2. T. S. Ibiyemi
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  3. J. S. Ojo
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Correspondence to O. O. Obiyemi.

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Obiyemi, O.O., Ibiyemi, T.S. & Ojo, J.S. On validation of the rain climatic zone designations for Nigeria. Theor Appl Climatol 129, 341–351 (2017). https://doi.org/10.1007/s00704-016-1787-9

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