Weekday/weekend difference of ambient ozone and its precursor concentrations in Osaka-Current condition and the factors-:Current condition and the factors
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概要
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From 1970s, it has been reported that O<SUB>3</SUB> concentrations at weekend is higher than weekday in the urban area such as America, while the concentrations of O<SUB>3</SUB> precursors such as NO<SUB>x</SUB> and NMHCs at weekend is lower than weekday. The phenomenon is called "weekend effect". We investigate the existence of the weekend effect, using the data observed in Osaka during April-September from 2001 to 2004. The concentrations of O<SUB>3</SUB>, NO<SUB>x</SUB> and NMHCs in Osaka were approximately 50 ppbv, 50 ppbv and 250 ppbvC, respectively. The weekend effect was confirmed at many monitoring stations. The averages of differences between the concentrations of NO<SUB>x</SUB> and NMHCs at weekday and those at weekend were obtained to be 1.47 ppbv, -15.86 ppbv and-34.96 ppbvC in 2001, 1.45 ppbv, -18.34 ppbv and-52.76 ppbvC in 2002, 5.52 ppbv, -15.31 ppbv and-35.86 ppbvC in 2003, 1.15 ppbv, -13.44 ppbv and-22.84 ppbvC in 2004, respectively. In order to investigate the causes of the weekend effect, we discussed the differences of (1) SPM concentrations, (2) NO<SUB>x</SUB> emission timing, (3) the NMHCs/NO<SUB>2</SUB> ratio, and (4) O<SUB>3</SUB> depletion by NO, between weekday and weekend.
- 社団法人 大気環境学会の論文
社団法人 大気環境学会 | 論文
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