Radio refractivity gradients in the lowest 100 m of the atmosphere over Lagos, Nigeria in the rainy-harmattan transition phase

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dc.contributor.authorDairo, Oluropo
dc.date.accessioned2022-04-20T17:37:44Z
dc.date.available2022-04-20T17:37:44Z
dc.date.issued2018
dc.description.abstractRadio engineers and researchers in conjunction with the International Telecommunication Union (ITU) have established the pivotal role of radio refractivity to the propagation of electromagnetic energy in the troposphere. In particular, the refractivity gradient statistics for the lowest 100m in the troposphere are used to determine the probability of occurrence of anomalous propagation conditions known as ducting. The major challenge to characterising the propagation condition over any environment is accessing the data of the lowest boundary layer of the atmosphere, which is highly dynamic and turbulent in evolution. High resolution radiosonde data from the Nigerian Meteorological Agency (NiMet) were used for a synoptic study of the rain-harmattan transition phase. The rain-harmattan transition phase marks the onset of the dry season due to the movement of the intertropical convergence zone interplay between (north-easterly and south-westerly) trade winds and monsoonal circulation. The lowest 100m data were analysed to determine the frequency of ducting per month. Progressive increase in the occurrence of ducting was observed during the rain-harmattan transition phase, which coincides with the West African Monsoon retreat. The results show significant divergence from previous studies, which reported that the tropospheric condition over Lagos (Geo. 6.5°N, 3.3°E), Nigeria, is predominantly super-refractive.en_US
dc.description.sponsorshipThis research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.en_US
dc.identifier.citationDairo, O.F., Kolawole, L.B. Radio refractivity gradients in the lowest 100m of the atmosphere over Lagos, Nigeria in the rainy-harmattan transition phase, Journal of Atmospheric and Solar-Terrestrial Physics, Vol. 167, 2018, pp. 169-176, ISSN 1364-6826, https://doi.org/10.1016/j.jastp.2017.12.001.en_US
dc.identifier.issn1364-6826
dc.identifier.urihttp://dspace.run.edu.ng:8080/jspui/handle/123456789/2352
dc.language.isoenen_US
dc.publisherElsevier Ltden_US
dc.relation.ispartofseriesOluropo Dairo;
dc.subjectRadio refractivityen_US
dc.subjectMeteorologyen_US
dc.subjectDuctingen_US
dc.subjectLate-monsoonen_US
dc.subjectPost-monsoonen_US
dc.titleRadio refractivity gradients in the lowest 100 m of the atmosphere over Lagos, Nigeria in the rainy-harmattan transition phaseen_US
dc.typeArticleen_US
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