VERTICAL VARIATION OF ABSOLUTE HUMIDITY OVER SELECTED STATIONS ACROSS NIGERIA USING SATELLITE DATA
OLUWAKEMI MARY ODEYEMI *
Department of Physics, Joseph Ayo Babalola University, Ikeji Arakeji, Nigeria.
*Author to whom correspondence should be addressed.
Abstract
An exponential model was developed for estimating absolute humidity. Meteorological data (temperature and relative humidity) were extracted for eight stations grouped into four selected regions across Nigeria. Monthly and Seasonal distribution of absolute humidity was calculated and analyzed for each station across the regions. The variations of absolute humidity were observed and the results showed that absolute humidity experiences seasonal trends across each station. The values of absolute humidity were high during the rainy months of April to October and low during the dry months of November to March. Values of absolute humidity were partially high during the rainy months of April to October in Coastal and Guinea Savannah regions with the observed dip in August. The absolute humidity for Midland region is relatively low throughout the year that shows the difference in the climate of the two regions. The variations obtained at Sahelian region is similar to that of Midland with single peak in June –August and July/August. The seasonal trend of variation in the Sahelian region was characterized with variations showing the maxima and the minima. The values of absolute humidity at all atmospheric pressure levels were conspicuously high during the rainy months than the dry months. It was also observed that there is exponential decreases across the stations. Validation and testing of the developed model for absolute humidity yield encouraged results on all the stations.
Keywords: Absolute humidity, coastal, Guinea Savannah, Midland, Sahelian
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References
Adeyemi B, Abidoye OO. Diurnal distribution of absolute humidity over West Africa Using Data Retrieved From Era-Interim. Nigeria Journal of Pure & Applied Physics. 2018;8: 1-15.
Ojo O. The Climate of West Africa. Heinemann, London. 1977;17:218.
Held LM, Soden BJ. Water Vapor Feedback and Global Warming 1. Annual Review of Energy and the Environment. 2000;25:441–475.
Emmanuel I, Adedayo K, Ojo O. Spatio -temporal variability of water vapour density over Nigeria using CM SAF Data. Advances in Physics Theories and Applications. 2015;47:23-31.
Donald CA. Essentials of Meteorology, An invitation to the Atmosphere. 2007; 5th Edition.
Jacob D. The Role of Water vapour in the Atmosphere: A Short Overview from a Climate Modeller’s Point of View. Physical. Chem. Earth (A). 2001;26:523-521.
Bean B, Dutton E. Radio Meteorology. National Bureau of Standards Monograph 92, Washington, DC; 1966.
Adeyemi B, Ogolo EO. Spatial distribution of surface water vapour density over Nigeria. Research Journal of Applied Sciences. 2007;2:129-131.
Adeyemi B, Ogolo EO. Variations and Trends of some meteorological parameters at Ibadan, Nigeria. The Pacific Journal of Science and Technology. 2009;10:981-987.
Adeyemi B, Aro TO. Variation of surface water vapour density over four Nigerian stations. Nigeria Journal of Pure and Applied Physics. 2004;3:38-44.
Olaniran OJ, Sumner GN. A study of climatic variability in Nigeria based on the onset, retreat and length of the rainy season. International Journal of Climatology. 1989;9:253-269.
Emmanuel I. Tropospheric refractivity over Nigeria using satellite data. M.Tech Dissertation. Federal University of Technology, Akure, Nigeria; 2009.
Olaniran OJ. The onset of rainfall and start of the growing season in Nigeria. Nigerian Geographical Journal. 1983;26:81-88.
ITU-R. Water vapour surface density and total columnar content. Recommendation International Telecommunication Union. 2013;836-1, 1-11.
Balogun EE. Seasonal and spatial variation in thunderstorm activity over Nigeria Weather. 1981;36:192-197.
Emmanuel I, Adeyemi B, Adedayo KD. Regional variation of columnar refractivity with meteorological variables from Climate satellite application facility (CM-SAF) data over Nigeria. International Journal of Physical Sciences. 2013;8:825-834.