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|Title:||Monitoring tropospheric radio refractivity over Nigeria Using CM-SAF data derived from NOAA-15, 16 and 18 Satellites|
|Keywords:||Inter-tropical discontinuity (ITD)|
Analysis of variance (ANOVA)
|Abstract:||The variability and structure of tropospheric refractivity (N) over Nigeria has been studied using monthly data of pressure, temperature and relative humidity for the period 2004-2006 for twenty six stations, obtained from the archives of the Department of Satellite Applications Facility on Climate Monitoring (CM-SAF) DWD, Germany. The data was retrieved from ATOVS observations onboard polar orbiting NOAA-15, 16 and 18 satellites. The results have shown that variations in each region and at different atmospheric levels are influenced by the North–South movement of inter–tropical discontinuity (ITD). Using the analysis of variance (ANOVA) technique on the climatological data, an empirical relationship of the form <i>N</i> = <i>ω</i> + <i>γN<sub>s</sub></i> (<i>ω</i>, <i>γ</i> constants) have been established between columnar refractivity and its surface value, N<sub>s, </sub>for the four regions (coastal, Guinea Savannah, midland and sub-Sahelian) in Nigeria. The initial tests carried out on the model using data obtained over the regions for the year 2007 yielded an encouraging result as have been established by the use of Kolmogorov-Smirnov tests.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.40(6) [December 2011]|
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