Effects of Temperature on Radio Duct Propagation in Selected Coastal Areas of Nigeria

DOI

10.2991/978-94-6463-644-4_14How to use a DOI?

Keywords

Ducting; modified radio refractivity gradient; temperature; coastal area

Abstract

Meteorological parameters of air temperature, relative humidity, and atmospheric pressure at the ground surface and 950 hPa pressure level at 09:00 LT obtained from the archive of European Centre for Medium-Range Weather Forecasts (ECMWF) Re-analysis ERA-Interim were used to compute modified radio refractivity and its gradient using ITU-R model. The results of the computation were used to deduce the temperature at which radio duct occurs in the selected coastal areas of Nigeria. The selected locations are Akpabuyo ( 4 . 88 ∘ N , 8.53 ∘ E ), Ekeremor ( 4 . 95 ∘ N , 5 . 81 ∘ E ), Port Harcourt ( 4 . 82 ∘ N , 7 . 05 ∘ E ), Badagry ( 6 . 43 ∘ N , 2 . 89 ∘ E ) and Ilaje, ( 6 . 26 ∘ N , 4 . 77 ∘ E ). The results show a similar overall pattern throughout the year in all the locations. Port Harcourt and Badagry often show the highest values while Akpabuyo frequently exhibits the lowest. The results as well show that the modified radio refractivity gradient, M´-values are highest during the wet season (April - October) with an average value of 117 M u n i t s / k m at Port Harcourt and Akpabuyo respectively, and lowest during the dry season (November - March) with an average of 105 M u n i t s / k m at Badagry. Ducting occurrences were found during the dry months of December, January, and February with - 13 M u n i t s / k m , - 12 M u n i t s / k m and - 5 M u n i t s / k m values at Port Harcourt respectively. It was also observed that; radio ducts that can trap radio signals in Nigeria’s coastal areas are formed at 26 ∘ ∁ or more.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - A. T. Adediji
AU  - A. P. Iwaotan
PY  - 2025
DA  - 2025/02/04
TI  - Effects of Temperature on Radio Duct Propagation in Selected Coastal Areas of Nigeria
BT  - Proceedings of the 8th URSI-NG Annual Conference (URSI-NG 2024)
PB  - Atlantis Press
SP  - 144
EP  - 156
SN  - 2352-541X
UR  - https://doi.org/10.2991/978-94-6463-644-4_14
DO  - 10.2991/978-94-6463-644-4_14
ID  - Adediji2025
ER  -