Ayassou, K.; Pazmiño, A.; Sabi, K.; Bazureau, A.; Godin-Beekmann, S. Evolution of Ozone above Togo during the 1979–2020 Period. Atmosphere2022, 13, 2066.
Ayassou, K.; Pazmiño, A.; Sabi, K.; Bazureau, A.; Godin-Beekmann, S. Evolution of Ozone above Togo during the 1979–2020 Period. Atmosphere 2022, 13, 2066.
Ayassou, K.; Pazmiño, A.; Sabi, K.; Bazureau, A.; Godin-Beekmann, S. Evolution of Ozone above Togo during the 1979–2020 Period. Atmosphere2022, 13, 2066.
Ayassou, K.; Pazmiño, A.; Sabi, K.; Bazureau, A.; Godin-Beekmann, S. Evolution of Ozone above Togo during the 1979–2020 Period. Atmosphere 2022, 13, 2066.
Abstract
The objective of this paper is to estimate the trend of Total Ozone Column (TOC) over Togo. Multi Sensor Reanalysis-2 (MSR-2) TOC over the entire territory of Togo were used. Multiple Linear Regression (MLR) method has been applied to retrieve the interannual contributions of different forcings and the long term variability. It was found that the Annual Oscillation (AnO), the Quasi Biennial Oscillation at 30 mb (QBO30), the Solar Flux (SF), and the El Niño–Southern Oscillation (ENSO) have statistically significant influence on the interannual variability of the TOC. The strongest contribution (22 ± 1.4 DU) is allocated to the AnO while the weakest (< 1 DU) is attributed to the Semi-Annual Oscillations (SAnO). Before the peak year of Equivalent Effective Stratospheric Chlorine (EESC) in tropics in 1997 the trend is negative (- 0.3% ± 0.9% per decade) and is not statistically significant. After the peak year, a statistically significant positive trend is observed. The trend of TOC is 0.6% ± 0.2% per decade. The monthly TOC trend over Togo is positive and statistically significant during the rainy season (particularly during the monsoon period) except in April, unlike during the harmatan period (DJF) where the trend is not significant.
Keywords
ozone; MLR; Togo; MSR-2; total column ozone; trend
Subject
Environmental and Earth Sciences, Atmospheric Science and Meteorology
Copyright:
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.
