The Short Term Analysis of Ground Ozone and Its Correlation with Meteorological Parameters over Kigali

J.D. Ndayisenga¹

Section:Research Paper, Product Type: Journal-Paper
Vol.7 , Issue.1 , pp.7-15, Jan-2021

Online published on Jan 31, 2021

Copyright © J.D. Ndayisenga . 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.
 

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Abstract :
The objectives of our study is to analyse and to correlate ground ozone with meteorological parameters, we realise that the ground ozone over Kigali is directly proporitional to the solar intensity especialy when the air temperature is less or equal to 19oC but when the air temperature exceed this range the reverse process take place, here the ground concentration of ozone start to reduce but R2 is very low this implies that there is a minimum probability to occur. For wind speed ranging from 2 to 2.81 m/s the ground concentration of ozone is inversely proportional to the solar intensity and when wind speed is above 2.81m/s ambient ozone increases as solar radiation increase. For lower level of wind speed (2 to 2.81 m/s) the ambient ozone concentration increases as atmospheric relative humidity increase and contrary when the wind speed level are greater than 2.81m/s the ambient ozone concentration decreases by increasing of atmospheric relative humidity. The average wind speed recorded was at 3.7402 m/s with calm condition of 0%. The dominant wind direction was westsouth with frequency of 31% followed by southeast and southwest wind with frequency of about 20.2% with maximum wind speed of 6 – 7.62 m/s. The southwest, southeast, south, west or east sources disperse pollution in north, northwest, northeast region during July to September 2020. In particular to ground ozone contained in wind speed recorded at lower lever of 10.3ppb to 20.2ppb was at 4.3217 m/s with the westerly, westsouth, southeast dominant direction with frequency of about 18%, 30%. And for other levels greater than 20.2 ppb, the ambient ozone was generally transported from several direction including west, southwest, south, southeast, and easterly direction with maximum wind speed of 6 – 7.62 m/s.

Key-Words / Index Term :
Ground Ozone, Openair model, meteorological parameters, Kigali, Rwanda

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