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Vertical distribution of air pollutants at the Gustavii Cathedral in Goteborg, Sweden

Artikel i vetenskaplig tidskrift
Författare Sara Janhäll
Peter Molnár
Mattias Hallquist
Publicerad i Atmospheric Environment
Volym 37
Nummer/häfte 2
Sidor 209-217
ISSN 1352-2310
Publiceringsår 2003
Publicerad vid Institutionen för fysik (GU)
Sidor 209-217
Språk en
Länkar doi:10.1016/S1352-2310(02)00858-0
Ämnesord sulphur dioxide, nitric acid, nitrogen oxides, vertical distribution, urban air pollution, total suspended particles, elemental composition, submicrometer particles, particulate matter, pollution, limestone, aerosol, dispersion, deposition, exposure, quality, profile
Ämneskategorier Tungmetaller och övriga metaller, Meteorologi och atmosfärforskning

Sammanfattning

Atmospheric trace gases and particles were measured at two heights at the Gustavii Cathedral in Goteborg, Sweden, during 7 weeks in September and October 1999. The Gustavii Cathedral is situated in the city centre of Goteborg, which is near the harbour area and encircled by heavy traffic some hundred metres away. The main body of the church is as high as the surrounding buildings, while the tower extends well above. The sampling points were placed on the west wall of the tower at 10 and 32 m height, i.e. well below and above the roof top level of surrounding buildings, respectively. Sulphur dioxide and nitric acid were sampled using the denuder technique and analysed by Ion Chromatography, IC. Total suspended particulates (TSP) were sampled using filter cups and subsequently analysed by energy dispersive X-ray fluorescence spectroscopy (EDXRF). In addition to the diurnal sampling of species, nitrogen oxides were measured using chemiluminescence detectors. Additional data from the Environmental Office in Goteborg was used in the analysis. Differences between the concentrations measured at the upper and lower levels were calculated and their variation and dependence on meteorological factors were evaluated. On the average larger concentrations were found at the lower level for soil derived elements and TSP, while nitric acid and nitric oxide showed larger concentrations at the upper level. Sulphur dioxide and nitrogen dioxide, as well as many of the elements in the TSP, showed equal concentrations at the two levels. However, depending on wind direction the measured differences of nitrogen oxides could be both positive and negative. (C) 2002 Elsevier Science Ltd. All rights reserved.

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