PAPER TITLE :TEMPORAL VARIATION AND DETECTION OF HOT SPOT OF TROPOSPHERIC NITROGEN DIOXIDE (NO ) FROM SATELLITE 2 MEASUREMENTS OVER WEST AFRICA

JOURNAL OF EARTH AND ATMOSPHERIC RESEARCH | VOLUME 3 NUMBER 1 2020

Paper Details

  • Author(s) : Oluleye, A. and Adigun, M.
  • Abstract:

We examine the seasonal and annual in addition to long-term mean of NO over the West African 2
region. The region was observed to be prone to pollution due to uncontrolled sources of emission
from various polluting sources. In this paper, we examine the relationship between the seasonal
variation of atmospheric variables and the pollutant, emphasizing the influence of the
atmospheric variables on the accumulation or reduction in the concentration of the pollutant.
The results of temporal analysis of NO revealed an annual average value of tropospheric NO2 2
column to be 2.624±0.04 molec/cm2. During the study period, the highest annual value of
2.67x1015molec/cm2 was found in 2011 while the lowest value of 2.5967x1015molec/cm2 is
observed in 2014 within the period of consideration. However, the linear regression on the
annual mean data shows a statistically significant (at confidence level of 99%) decadal increase
of 27% with a slope of 0.0024 (±0.54), correlation coefficient (R2) 0.0724 and y intercept at
2.6127 (±0.019).Hot spot detection analysis carried out also indicated that the locations of
highest accumulation in the annual cycle depend strongly on variation of atmospheric elements
favorable to the accumulation of the pollutant. The implication of this result is that an increasing
trend of NO has been detected over West Africa which can be linked to enhanced signature of 2
anthropogenic activities such as biomass and fossil fuel burning.