Empirical Evaluation of Wet -Term of Refractivity in Nigeria

Abstract

This paper presents the evaluation of the wet-term of the surface refractivity for twenty three sites in Nigeria carefully selected such that there is wide coverage for the country using ten-year data collected from Nigeria Meteorological Agency. The analysis showed that the southern sites have higher N-wet values compared to the northern sites. 50 % of the time, wet term refractivity is higher than 100 N-units in the southern sites. However, six out of eleven northern sites considered have values less than 50 N-units during the dry season