Assessment of transboundary mass fluxes of air pollutants by aircraft measurements: A preliminary survey with reference to a case study |
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| Institution: | 1. Department of Occupational Respiratory Diseases, National Institute of Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention, Beijing 100050, China;;2. Department of Occupational Medicine and Toxicology, Clinical Center for Interstitial Lung Diseases, Beijing Institute of Respiratory Medicine, Beijing Chao-Yang Hospital Capital Medical University, Beijing 100020, China.;1. Minerals to Metals Initiative, New Engineering Building, Department of Chemical Engineering Upper Campus, University of Cape Town, Rondebosch, 7700, South Africa;2. Future Water Institute, New Engineering Building, Upper Campus, University of Cape Town, Rondebosch, 7700, South Africa |
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| Abstract: | A technique has been employed by which transboundary mass fluxes of SO2, SO42−, NOx, NO3−, and O3 are assessed. As an example the results of one measuring flight are presented. This flight was carried out along the eastern and western border of the Netherlands. An uncertainty analysis yields that the accuracy of calculated transboundary mass fluxes is most dependent on the accuracy of the values for the depth of the mixing layer and the wind velocity. Mass fluxes calculated in this case study appear to be accurate within ± 55 %, apart from inaccuracies due to non-representativity of concentration and wind data with respect to the mixing layer. On the basis of the uncertainty analysis, recommendations for further improvement of the method are made so that a reduction of this ± 55 % to ± 20 % can be achieved. Finally, conclusions about the origin of the observed pollution are drawn. |
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