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Simulation of the Transport and Deposition of PCDD/Fs in the Atmospheric in Yangtze River Delta Region

Author: ZhangZuo
Tutor: ZhuBin；MengFan
School: Nanjing University of Information Engineering
Course: Atmospheric Physics and Atmospheric Environment
Keywords: Yangtze River Delta PCDD / Fs CMAQ
CLC: X51
Type: Master's thesis
Year: 2011
Downloads: 58
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Abstract


Dioxins (PCDD / Fs) are a class of persistent , semi-volatile , bioaccumulative and toxic persistent organic pollutants , can constitute a huge danger to the health of humans and other mammals . At present , the atmosphere dioxins produced by combustion processes involving chlorine-containing materials , metal smelting , petrochemical and chemical industries , because of its long residence time in the atmosphere , can result in regional and even long-distance transmission global impact. Dioxins semi-volatile substances in the interaction between the gaseous and aerosol transfer , thus affecting its atmospheric physical and chemical processes . Chemical transport model MODELS-3/CMAQ, the emission source handler SMOKE mesoscale meteorological model MM5 composition of the air quality numerical models have a wide range of applications on a global scale , but in the country also use this mode to dioxin analog of the British class material . This article using the MM5 meteorological fields , SMOKE sources of emissions data pre-processing , coupled organics absorption and black carbon adsorption of dioxins particulate - gaseous alternate allocation module and chemical transformation of regional atmospheric chemistry transport model CMAQ simulated 2006 a January , April , July and October PCDD / Fs in the atmosphere , transporting , transforming and sedimentation , the Yangtze River Delta region , the evolution of the seasonal variation of the dioxin-like pollutants in the atmosphere and settlement characteristics . The simulation results show that dioxin-like pollutants in the Yangtze River Delta region , the local subsidence few , there was the long-distance transmission characteristics and regional impacts . The dioxins concentration distribution of four distinct seasons , winter atmospheric dioxin-like pollutant concentration was significantly higher than in summer , mainly related to the emission of pollutants and local meteorological factors . The wet deposition is the main settlement way settlement amount is about four times the dry deposition . The distribution characteristics of the dioxin homologues was typical of the \Model results with observational data were preliminary comparison , simulation results with the limited distribution of the observations in the concentration range between isomers is close , but still need further validation .

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Atmospheric pollution and its control
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