Phase synchronization between tropospheric radio refractivity and rainfall amount in a tropical region
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Date
2016-11-01
Journal Title
Journal ISSN
Volume Title
Publisher
Springer Vienna
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
Keywords
Phase synchronization, Radio refractivity, Precipitation, Recurrence plot, RQA, Climate
Citation
Ogunjo, S. T., Adediji, A. T., & Dada, J. B. (2017). Investigating chaotic features in solar radiation over a tropical station using recurrence quantification analysis. Theoretical and applied climatology, 127(1-2), 421-427.