Study on the Characteristics of Atmospheric Environmental Pollution in Jining City
4页1、Xiaomo Wang et a1Study on the Characteristics of Atmospheric Environmental Pollution in Jining City 9 ation of wind speedchange ln atmospheric inversion Iayer and human activities in winterIn Jiningwind speed was the mini- mum fr0m 07:00 t0 08:0o and then increased to the maximum fr0m 13:00 t0 17:00Wind speed decreased after 17:0oand wind was calm at nightGentle or calm wind was not conducive to diffusion of atmospheric pollutants。so that atmospheric pol- Iution became more seriousWhen wind was
2、gentle。air current became Iess turbulent due to atmospheric inversion laver caused by radiation,and atmospheric pollution became most serious at night,In the morningatmospheric inversJon Iayer was damaged and raised gradually after sunrise。and turbulent mixing layer was formed at the Iower layerso that verticaI dif- fusion was inhibitedand the concentrations of atmospheric pol- Iutants increased to the maximum values。From April to Sep- tember,compared with the heating period,the first peaks of p
3、ollutant concentrations in the atmosphere appeared 3 h earlier in the morningwhile the second peaks appeared 12 h Iater at nightAt the moment people went to work or came off work, and traffic congestion was commonshowing that human activi ty was one of reasons for increased pollution 譬 墨 矗 8 莒 曼 兰 口0 0 0 00口 0 0 0 0 0 0 TiI【le Fig1 Daily changes in the concentrations of SO2,NO2 and PM10 in the atmosphere of Jining City in the heating period 要 鲁 8 晷 童 兰 nle Fig2 Daily variations in the concentrat
4、ions of SO2,NO2 and PM1o in the atmosphere of Jining Clty from April to September 22 Seasonal variation According to Fig3there were ob vious seasonal variations in the concentrations of SO2,NO2 and PM10 in the atmosphere of Jining City,that is,air pollution was the most serious in winter but slightest in summerAnnual averages of SO2,NO2 and PM1n concentration in the atmosphere during2OO62D1Owere 0060,0038 and0103 mQm。respec- tivelyMoreover,the maximum concentrations of SO,and PM, appeared in Dec
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