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Trend analysis of meteorological parameters (temperature, pressure, andrelative humidity) as well as calculated refractivity, equivalent potentialtemperature (EPT) for a pseudo-adiabatic process, and field strength inCalabar, Southern Nigeria has been analyzed using Mann-Kendall trend test andSens slope estimator. Data of the meteorological parameters were obtained fromthe Nigerian Meteorological Agency (NiMet) in Calabar for 14 years (2005 -2018). Results show that the maximum and average temperature, atmosphericpressure, refractivity, EPT and field strength all exhibited a positive KendallZ value with 2.52, 0.33, 3.83, 0.77, 0.44 and 3.18 respectively which indicatedan increasing trend over time, with only maximum temperature, atmosphericpressure and field strength showing a significant increase at 5% (0.05) levelof significance, since their calculated p-values (0.012, 0.0001, and 0.001)were less than 0.05. The relative humidity and minimum ambient temperatureshowed a decrease in trend over time as they both had a negative Kendall Zvalues (-0.11 and -1.09 respectively), however, together with the averageambient temperature and refractivity, their trend was not significant 5% levelof significance since their calculated p-values were all more than 0.05. Linearregression, correlation and partial differentiation showed that relativehumidity has the most effect on the changes in seasonal refractivity and anindirect relationship with field strength variability. The relationship betweenEPT and refractivity has been discovered to be very strong and positive.Descriptive statistics has been used to portray the seasonal and annual trendof all parameters.

Trend Analysis of Meteorological Parameters, Tropospheric Refractivity,  Equivalent Potential Temperature for a Pseudoadiabatic Process and Field  Strength Variability, Using Mann Kendall Trend Test and Sens Estimate