A case study of the spatial distribution of ozone and its precursors over the Hong Kong territories using kriging method

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A case study of the spatial distribution of ozone and its precursors over the Hong Kong territories using kriging method

 

Author: Wong, Yu-hung
Title: A case study of the spatial distribution of ozone and its precursors over the Hong Kong territories using kriging method
Degree: M.Sc.
Year: 2000
Subject: Ozone
Kriging
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Civil and Structural Engineering
Pages: [vi, 85, 16] leaves : ill. (chiefly col.), col. maps ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1559481
URI: http://theses.lib.polyu.edu.hk/handle/200/4791
Abstract: According to the HKEPD, the annual average of O3 in 1997 was about 67% higher than that in 1990, which was much higher than the increases of RSP and NO2 during the same time period.Considering this alarming ozone trend, a better understanding of the origin of ozone was critical. The focuses of this study were on the sources and the spatial distribution of ozone and its precursors. In order to present the monitoring data in a more comprehensive way, the Kriging method was used to transform the monitoring data into contours. The major contribution of ozone in Hong Kong was from the upstream areas. It was noticed that the upstream ozone concentration under northerly wind doubled that under southerly wind. Such a big difference was because of different emission loadings of ozone precursors in the north and the south of Hong Kong. During pollution episode day, however, about one third of the ozone recorded at the downstream was found to be contributed from the ozone formation over the Hong Kong territory. This was because the ozone precursors were trapped below the inversion layer and enhanced the ozone formation rate. Based on the VOC monitoring data collected by HKPolyU in both 1997 and 1998, different VOC species were selected and grouped according to their emission sources and spatial distribution. It was noticed that there was a substantial enhancement of the VOC in 1998, especially those VOC species from the evaporated gasoline, vehicle exhaust and degreasing solvent. However, it was identified that there were discrepancies in using aromatic compound and olefins as tracers for vehicle exhaust.

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