scholarly journals Analysis of temporal and spatial variability of total column ozone over West Africa using daily TOMS measurements

2013 ◽  
Vol 4 (4) ◽  
pp. 387-397 ◽  
Author(s):  
Ayodeji Oluleye ◽  
Emmanuel Chilekwu Okogbue
Keyword(s):  
West Africa ◽  
Spatial Variability ◽  
Total Column Ozone ◽  
Temporal And Spatial Variability ◽  
Temporal And Spatial ◽  
Column Ozone ◽  
Total Column

The geography and climatology of aerosols

2003 ◽  
Vol 27 (4) ◽  
pp. 502-547 ◽  
Author(s):  
Helen C. Power
Keyword(s):  
Spatial Variability ◽  
Climatic Factors ◽  
Polar Front ◽  
Geographic Region ◽  
Climate System ◽  
Radiative Properties ◽  
Aerosol Emission ◽  
Temporal And Spatial Variability ◽  
Temporal And Spatial ◽  
Total Column

Aerosols affect climate by scattering and absorbing radiation and by modifying the physical and radiative properties of clouds. Despite their importance in the climate system, the temporal and spatial variability of aerosols is not well understood. This paper briefly describes the nature of aerosols, their influence on the climate system and methods for quantifying atmospheric turbidity, which is the total column amount of aerosol. The main focus of the paper is a review of turbidity research that serves to document how and why aerosols vary over time and space. This analysis reveals that temporal and spatial variability in aerosol emissions is superimposed by temporal and/or spatial variability in meteorological and climatic factors. These factors include variability in wind speed, humidity, stability, insolation, frontal and cyclonic activity, the position of the Intertropical Convergence Zone and the polar front, rates of precipitation and convection, and the source regions of air masses. This interaction between aerosol emission characteristics and atmospheric processes is manifested in distinct trends in total column aerosol -described herein by geographic region - at a variety of spatial and temporal scales.

scholarly journals The Influence of Rainfall and Temperature on Total Column Ozone over West Africa

2017 ◽  
Vol 10 (2) ◽  
pp. 1-11 ◽  
Author(s):  
E Eresanya ◽  
A Oluleye ◽  
M Daramola
Keyword(s):  
West Africa ◽  
Total Column Ozone ◽  
Column Ozone ◽  
Total Column

scholarly journals Assessing the Influence of Inter Tropical Discontinuity on Total Column Ozone Variation Over West Africa

2021 ◽  
Author(s):  
Ayomide Victor Arowolo ◽  
Ayodeji Oluleye
Keyword(s):  
West Africa ◽  
Pearson Correlation ◽  
Kendall Test ◽  
Relevant Information ◽  
Total Column Ozone ◽  
Study Region ◽  
Dewpoint Temperature ◽  
Column Ozone ◽  
The Relationship ◽  
Total Column

Abstract The focus of this study is to evaluate the influence of Intertropical Discontinuity (ITD) on the variation of Total column ozone (TCO). Relevant information is supplied on the temporal and spatial variability of TCO along the ITD zone, which is an important factor influencing the earth's atmosphere. Several studies over the years have established the relationship and influence several atmospheric processes have on TCO. However, the relationship between Intertropical discontinuity and TCO over West Africa has a gap. This study tends to examine the influence ITD has on TCO variation using the West Africa region as a case study. The study used Wind, ozone and dewpoint temperature data for the period between 1980-2019. To assess the variability and trend over the study region, several statistical methods were used, including Pearson correlation, Mann-Kendall, and linear regression model. The Mann-Kendall test shows an increasing trend throughout the months over the study region. Spatial analysis also revealed that regions North of the ITD has a higher concentration of TCO that the southern region of the ITD. however, ITD influence was more visible during the wet month of June to August (JJA) as the highest concentration of TCO was observed during this period across all latitude but more deviation was observed between latitude 100N to 180N, while the least occurrence is observed when ITD is at its minimum position in the month of December to February (DJF). The ACRV shows that 140N exhibit the highest variation with a value of 4.84, while the deviation is also at its highest with value of 13.65. The monthly position of ITD for Forty years was also analysed to observe the monthly deviation along the ITD region forty years and the spatial distribution of TCO was analysed from January to December. It’s of note that during the cause of this study, ozone hole which is designated by concentration less than or equal to 220DU was not recorded. The highest and the lowest value of TCO is 295DU and 227DU respectively with an average range of 68DU.

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