Surface O3 temporal variation, photolysis and accumulation in urban Tunis (North Africa) during January to December, 2016: influence of meteorology and chemical precursors
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Abstract
The present study investigated the temporal variability of surface O3 and its (NO, NO2 and CO) precursors at the proximity of a busy trafficked crossroad located in urban Tunis, Tunisia. It was performed during January to December, 2016. The results revealed that the diurnal profiles of selected precursors were characterized by maxima at traffic-peak hours linked to the effect of automobile traffic being a close source. At traffic-peak hours, the decrease of O3 concentration levels is due to the oxidation reaction of NO into NO2. Based on the diurnal profile per each month, the duration of O3 accumulation was shown close to five hours, with higher accumulation rates in the summer season (2.4 to 3 ppb/h) and also in March (3 ppb/h). The lower accumulation ones were, however, observed in the other months (1.1 to 1.9 ppb/h). The O3 excess pronounced from the 10th March to the 1st April, 2016 was due to the effect of the persistence of a Rex-type blocking anticyclone over Central Europe. Compared to extremely stable conditions occurring in hot seasons (summer and autumn), the recorded moderate stable conditions during such Rex was categorized by a marked deviation between day-night intercepts (41% against 23%). This could be attributed to the cumulative effect of the biogenic VOCs and the seasonal excess of CO interfering in the photochemical cycle. It, therefore, implies that the study site is CO and VOC-sensitive.
期刊介绍：
Air Quality, Atmosphere, and Health is a multidisciplinary journal which, by its very name, illustrates the broad range of work it publishes and which focuses on atmospheric consequences of human activities and their implications for human and ecological health.
It offers research papers, critical literature reviews and commentaries, as well as special issues devoted to topical subjects or themes.
International in scope, the journal presents papers that inform and stimulate a global readership, as the topic addressed are global in their import. Consequently, we do not encourage submission of papers involving local data that relate to local problems. Unless they demonstrate wide applicability, these are better submitted to national or regional journals.
Air Quality, Atmosphere & Health addresses such topics as acid precipitation; airborne particulate matter; air quality monitoring and management; exposure assessment; risk assessment; indoor air quality; atmospheric chemistry; atmospheric modeling and prediction; air pollution climatology; climate change and air quality; air pollution measurement; atmospheric impact assessment; forest-fire emissions; atmospheric science; greenhouse gases; health and ecological effects; clean air technology; regional and global change and satellite measurements.
This journal benefits a diverse audience of researchers, public health officials and policy makers addressing problems that call for solutions based in evidence from atmospheric and exposure assessment scientists, epidemiologists, and risk assessors. Publication in the journal affords the opportunity to reach beyond defined disciplinary niches to this broader readership.
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