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Full-Text Articles in Physics
Steady States And Transport Processes In Urban Ozone Balances, M. A. K. Khalil
Steady States And Transport Processes In Urban Ozone Balances, M. A. K. Khalil
Physics Faculty Publications and Presentations
Core chemical theory is combined with transport processes and local emissions to study the validity of commonly made assumptions regarding steady states to interpret urban and regional ozone data. It is shown that photo-stationary states of NO and NO2 cannot exist in urban areas or polluted regions in addition to the lack of such a state for ozone. Calculations in published papers, which make the assumption of a photo-stationary state for NO and NO2, or ozone, are likely to be inaccurate by unacceptable amounts. The Leighton Ratio is re-interpreted to show how it incorporates both the peroxy radical and transport …
Ozone Balances In Urban Saudi Arabia, M. A. K. Khalil, Christopher L. Butenhoff, R.M. Harrison
Ozone Balances In Urban Saudi Arabia, M. A. K. Khalil, Christopher L. Butenhoff, R.M. Harrison
Physics Faculty Publications and Presentations
Net ozone production rates averaging 130 ppb/h lasting 3–5 h are calculated for five cities of urban Saudi Arabia where hourly ozone and NO2 measurements were taken for a whole year. Concentrations of ozone in the cities are not unusually high at ~40 ppb during the peak 4 h, but are 50–60 ppb at altitude throughout the day. A mass balance of ozone reveals that the locations represented by the sites export ozone during the peak production periods before mid-day at average rates comparable to the net production, but later a substantial import of ozone is required to balance the …