Daniel Q. Tong Viney P. Aneja S. Pal Arya John D. Ray
Abstract
Despite a decreasing trend nationwide, eight-hour O>SUB align=right>>SMALL>3>/SMALL>>/SUB> concentrations in 25 of US national parks have increased by 8% during last decade. This study presents a 13-year observation of high O>SUB align=right>>SMALL>3>/SMALL>>/SUB> 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. O>SUB align=right>>SMALL>3>/SMALL>>/SUB> exceedances occurred most frequently in June at MACA, and in August or September at GRSM. High O>SUB align=right>>SMALL>3>/SMALL>>/SUB> episodes at MACA occurred during daytime or early evening, but exceedances at GRSM can be found in any hour. Air masses with high O>SUB align=right>>SMALL>3>/SMALL>>/SUB> at GRSM came from all directions, whereas those at MACA are predominantly from the southwest. Case studies show that high O>SUB align=right>>SMALL>3>/SMALL>>/SUB> episodes at MACA are developed under clear sky, high temperature, low humidity, and weak winds traveling in a uniform anti-cyclonal pathway.
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Volume (Year): 6 (2006) Issue (Month): 2 (January) Pages: 173-188 Download reference. The following formats are available: HTML
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