Application Of Air Compass Software For Source Identification Of Semi-volatile Organic Compounds In Whitbourne, UK
Price
Free (open access)
Transaction
Volume
157
Pages
10
Page Range
179 - 188
Published
2012
Size
1,958 kb
Paper DOI
10.2495/AIR120161
Copyright
WIT Press
Author(s)
S. Pongpiachan, T. Supadit, P. Hirunyatrakul, I. Kittikoon & S. Whangthamrongwit
Abstract
One of the most controversial issues on air pollution field is how to quantitatively identify the emission source of gaseous species in atmospheric environment. Air Compass Software was carefully designed for this special purpose by using C# program. Given that wind direction is measured as an angle (α) relative to true north (0), mean direction was determined by using trigonometric relations to determine the direction of the resultant of individual wind vectors. The emission source strength – wind direction relationship can be represented graphically by plotting R-value of (natural logarithm of partial pressure) vs. against downwind angle (α) during the monitoring period. To apply this relationship, measured atmospheric concentrations must be expressed as partial pressures (P), which can be converted through the use of the ideal gas law with a temperature correction. The aims of this study are to statistically quantify the relationships between emission source strengths and downwind angles of Semi-Volatile Organic Compounds (SVOCs) measured at Whitbourne monitoring stations adjacent to Worcester city, UK from 20/11/2003 to 22/12/2003 (cold-period) and from 5/5/2004 to 26/5/2004 (warm-period). Air
Keywords
semi-volatile organic compounds, wind direction, trigonometric, air compass software, Whitbourne