Next Article in Journal
Inland Concentrations of Cl2 and ClNO2 in Southeast Texas Suggest Chlorine Chemistry Significantly Contributes to Atmospheric Reactivity
Next Article in Special Issue
Optical Properties of Fine Particulate Matter in Upper Silesia, Poland
Previous Article in Journal
Ultrafine Particles in Residential Indoors and Doses Deposited in the Human Respiratory System
Previous Article in Special Issue
Estimation of the PM2.5 Pollution Levels in Beijing Based on Nighttime Light Data from the Defense Meteorological Satellite Program-Operational Linescan System
Article Menu

Export Article

Open AccessArticle
Atmosphere 2015, 6(10), 1462-1486; doi:10.3390/atmos6101462

Long-Term Trend and Seasonal Variability of Horizontal Visibility in Nigerian Troposphere

1
School of Physics, UniversitySains Malaysia, Pulau Pinang 11800, Malaysia
2
Hassan Usman Katsina Polytechnic, Katsina P.M.B 2052, Nigeria
*
Author to whom correspondence should be addressed.
Academic Editors: Giovanni Pitari and Gabriele Curci
Received: 24 August 2015 / Revised: 28 September 2015 / Accepted: 28 September 2015 / Published: 2 October 2015
(This article belongs to the Special Issue Atmospheric Aerosols and Their Radiative Effects)
View Full-Text   |   Download PDF [1591 KB, uploaded 13 October 2015]   |  

Abstract

A study of the long-term variability; trend and characteristics of visibility in four zones of Nigeria was carried out. Visibility and other meteorological data from NOAA-NCDC and aerosol index data over Nigeria during 1984–2013 are analyzed using time series and simple regression model. There are significant decreasing trends for every region and season during the 30-years period; the fluctuations exhibited nearly similar pattern. The 30-year mean visibilities for the four zones (Sahel; North Central; Southern; and Coastal) were 13.8 ± 3.9; 14.3 ± 4.2; 13.6 ± 3.5 and 12.8 ± 3.1 km with decreasing trends at the rates of 0.08; 0.06; 0.02 and 0.02 km/year. In all the zones; visibilities were better in summer while worse in Harmattan (dry season). During summer visibility was best in Sahel and North-central; however; in Harmattan visibility was best in southern and coastal zones. It was best between May and June (17.6; 18.9; 16.6 and 15.1 km) with a second peak in September. The 30-year seasonal averages were 16.2 ± 2.1; 16.8 ± 2.4; 15.4 ± 1.8 and 14.0 ± 2.2 km in summer; and 10.2 ± 2.5; 10.9 ± 2.9; 11.0 ± 3.3 and 11.4 ± 3.0 km in Harmattan for the respective zones. Sahel and North Central had the worse visibility reduction during Harmattan compared with Southern and coastal areas. An analysis based on simple regression equation reveals a strong and negative relationship between visibility on one hand; AI; and AOD on the other hand. The analysis also discusses the variability regarding the frequency of occurrence of a dust storm; dust haze; and good visibility over the period of study. View Full-Text
Keywords: aerosol index; air pollution; atmospheric visibility; dust event; Nigerian environment; Harmattan period aerosol index; air pollution; atmospheric visibility; dust event; Nigerian environment; Harmattan period
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Balarabe, M.; Abdullah, K.; Nawawi, M. Long-Term Trend and Seasonal Variability of Horizontal Visibility in Nigerian Troposphere. Atmosphere 2015, 6, 1462-1486.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Atmosphere EISSN 2073-4433 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top