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• W1490752823 abstract "The Tamar Valley is a well-defined coastal valley, located in northern Tasmania(Australia). The valley has significant air pollution problems. At Bell Bay,approximately 5 km inland, there is a heavy industrial estate containing analuminium smelter, a ferroalloy smelter, a medium density fibreboard plant and athermal power station. The city of Launceston (pop. 72 000) is located 65 km inland,at the head of the valley. Launceston has a significant winter woodsmoke problem,regularly exceeding the 24-hour National Environment Protection Council (NEPC)goal for PM,o particles.Data from a network of 16 meteorological stations were combined to produce aclimatology of the Tamar Valley, with many variables being mapped on a seasonalbasis. The most important climatological parameters were amalgamated into anindex of air pollution potential.A diagnostic wind field model, NUATMOS was used to model hourly wind fields fortwo-day periods each season under poor dispersion conditions. The modelled windfields clearly showed the dominant flows occurring in the valley under anticyclonicconditions. Coastal westerlies and sea breezes are channelled inland along thenorthwest-southeast aligned valley. At night, there is a transition to down-slope anddown-valley winds, which drain out of the valley.The CITPUFF Gaussian puff dispersion model was used to simulate dispersion ofcurrent winter woodsmoke emissions throughout the valley under poor-dispersionconditions. This model was used to help devise woodsmoke reduction strategies.The findings show that a 72 % reduction in woodheater numbers in Launceston isrequired to meet the NEPC particle goal. This goal is exceeded only in the Launceston region, and is chiefly caused by local sources, with only 4% of theparticles modelled within Launceston originating outside of the city. Measuredparticle concentrations in Launceston have declined over the past few years, howeveradditional measures are required if the NEPC goal is to be met. The introduction ofreticulated natural gas to Launceston will allow the NEPC goal to be met if the cityexperiences an uptake to gas heating similar to that experienced by Canberra whengas was introduced. A more realistic scenario, with an uptake half that ofCanberra's, would provide a significant reduction in PM,o concentrations, howeverthis alone would not meet the NEPC goal. Banning open fires and non-certifiedwoodheaters would come close meeting the goal. The goal is most likely to be metusing a combination of reduction measures.Dispersion of SO2 from the combined Bell Bay industrial sources was modelled foreach season, showing frequent exceedences of the NEPC hourly goal for SO2. TheBell Bay thermal power station was the dominant source, however this will shortlybe converted from oil-fired to gas-fired operation. Modelled NO^ emissions from thegas-fired power station reveal a significant reduction in the number of exceedences." @default.
• W1490752823 created "2016-06-24" @default.
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• W1490752823 date "2001-07-01" @default.
• W1490752823 modified "2023-09-26" @default.
• W1490752823 title "Air pollution dispersion within the Tamar Valley" @default.
• W1490752823 hasPublicationYear "2001" @default.
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