Phase synchronization between tropospheric radio refractivity and rainfall amount in a tropical region
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Date
2016-09-20
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Atmospheric and Solar–Terrestrial Physics
Abstract
This study investigated linear and nonlinear relationship between the amount of rainfall and radio refractivity in
a tropical country, Nigeria using forty seven locations scattered across the country. Correlation and Phase
synchronization measures were used for the linear and nonlinear relationship respectively. Weak correlation
and phase synchronization was observed between seasonal mean rainfall amount and radio refractivity while
strong phase synchronization was found for the detrended data suggesting similar underlying dynamics between
rainfall amount and radio refractivity. Causation between rainfall and radio refractivity in a tropical location was
studied using Granger causality test. In most of the Southern locations, rainfall was found to Granger cause
radio refractivity. Furthermore, it was observed that there is strong correlation between mean rainfall amount
and the phase synchronization index over Nigeria. Coupling between rainfall and radio refractivity has been
found to be due to water vapour in the atmosphere. Frequency planning and budgeting for microwave
propagation during periods of high rainfall should take into consideration this nonlinear relationship.
Description
Staff Publication
Keywords
Phase synchronization, Radio refractivity, Precipitation, Recurrence plot, RQA, Climate
Citation
Fuwape, I. A., Ogunjo, S. T., Dada, J. B., Ashidi, G. A., & Emmanuel, I. (2016). Phase synchronization between tropospheric radio refractivity and rainfall amount in a tropical region. Journal of Atmospheric and Solar-Terrestrial Physics, 149, 46–51. doi:10.1016/j.jastp.2016.09.009