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Title: Monitoring tropospheric radio refractivity over Nigeria Using CM-SAF data derived from NOAA-15, 16 and 18 Satellites
Authors: Adeyemi, Babatunde
Emmanuel, Israel
Keywords: Inter-tropical discontinuity (ITD)
Columnar refractivity
Tropospheric refractivity
Surface refractivity
Analysis of variance (ANOVA)
Issue Date: Dec-2011
Publisher: NISCAIR-CSIR, India
PACS No.: 92.60.hf
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 N = ω + γNs (ω, γ constants) have been established between columnar refractivity and its surface value, Ns, 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.
Page(s): 301-310
CC License:  CC Attribution-Noncommercial-No Derivative Works 2.5 India
ISSN: 0975-105X (Online); 0367-8393 (Print)
Source:IJRSP Vol.40(6) [December 2011]

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