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International Journal of Technology Enhancements and Emerging Engineering Research (ISSN 2347-4289)
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IJTEEE >> Volume 4 - Issue 2, February 2016 Edition



International Journal of Technology Enhancements and Emerging Engineering Research  
International Journal of Technology Enhancements and Emerging Engineering Research

Website: http://www.ijteee.org

ISSN 2347-4289



Seasonal And Monthly Estimation Of Mean Resi-dence Time Of The Harmattan Dust In Kano, Northern Nigeria Using Horizontal Visibility Data

[Full Text]

 

AUTHOR(S)

A. O. Essienimo, M. Momoh, D. O. Akpootu

 

KEYWORDS

Horizontal Visibility, Harmattan season, Mean Residence Time, kano, Aerosol dust

 

ABSTRACT

Kano, (12.05° N, 8.56° E) located in the extreme North of Nigeria, with an altitude of 476 m above sea level (asl.) and station number 650460 (DNKN), is one of the regions that records the least horizontal visibility of near zero in northern Nigeria during winter season due to the presence of harmattan dust particles in the air. This paper therefore, investigates the Mean Residence Time (MRT) of aerosol dust during the harmattan (winter) season using horizontal visibility data of the area. The horizontal visibility data of Kano was obtained from historical meteorological database of Tutiempo Network, for 12 harmattan seasons (2003/2004-2014/2015) with each season covering a period of the five months of harmattan season from (November–March). The results obtained, indicates that there is a downward trend in mean seasonal horizontal visibility by 0.016km per harmattan season. The seasonal average is 6.8 ± 1.5 km . The maximum and minimum seasonal average visibility are 8.9 ± 1.1 km (10-7.8 km) and 5.4 ± 2.8 km (8.2-2.6 km) respectively. Similarly, the estimated result of Mean Residence Time of dust aerosol shows a seasonal average Mean Residence Time (MRT) of 6 ± 2.4 days, with maximum and minimum seasonal average of 8.4 ± 4.7 days and 2.7 ± 1.8 days respectively. The trend reveals that the seasonal Mean Residence Time (MRT) decreases by 0.165km per harmattan season.

 

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