Temporal variability and case study of high O 3 episodes in two southeastern US national parks

Daniel Q. Tong, Viney P. Aneja, S. Pal Arya and John D. Ray

International Journal of Global Environmental Issues, 2006, vol. 6, issue 2/3, 173-188

Abstract: Despite a decreasing trend nationwide, eight-hour O₃ concentrations in 25 of US national parks have increased by 8% during last decade. This study presents a 13-year observation of high O₃ at the Great Smoky Mountains (GRSM) and Mammoth Cave (MACA) national parks, both among the 25 impacted parks. Although there is no monotonic increase, the later half witnessed three-fold exceedances than the former. O₃ exceedances occurred most frequently in June at MACA, and in August or September at GRSM. High O₃ episodes at MACA occurred during daytime or early evening, but exceedances at GRSM can be found in any hour. Air masses with high O₃ at GRSM came from all directions, whereas those at MACA are predominantly from the southwest. Case studies show that high O₃ episodes at MACA are developed under clear sky, high temperature, low humidity, and weak winds traveling in a uniform anti-cyclonal pathway.

Keywords: air quality; air pollution; high O 3 episodes; national parks; O 3 exceedance; temporal variability; national parks; United States; USA; ozone concentrations. (search for similar items in EconPapers)
Date: 2006
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