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Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.40 [2011] >
IJRSP Vol.40(6) [December 2011] >
| 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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