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Simulation off Air Quality Impacts from Prescribed Fires on an Urban Area

机译：模拟城市规定的火灾对空气质量的影响

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On February 28, 2007, a severe smoke event caused by prescribed forest fires occurred in Atlanta, GA. Later smoke events in the southeastern metropolitan areas of the United States caused by the Georgia-Florida wild forest fires further magnified the significance of forest fire emissions and the benefits of being able to accurately predict such occurrences. By using preburning information, we utilize an operational forecasting system to simulate the potential air quality impacts from two large February 28th fires. Our "forecast" predicts that the scheduled prescribed fires would have resulted in over 1 million Atlanta residents being potentially exposed to fine particle matter (PM2.5) levels of 35 μg m~(-3) or higher from 4 p.m. to midnight. The simulated peak 1 h PM2.5 concentration is about 121 μg m~(-3). Our study suggests that the current air quality forecasting technology can be a useful tool for helping the management of fire activities to protect public health. With postburning information, our "hindcast" predictions improved significantly on timing and location and slightly on peak values. "Hindcast" simulations also indicated that additional isoprenoid emissions from pine species temporarily triggered by the fire could induce rapid ozone and secondary organic aerosol formation during late winter. Results from this study suggest that fire induced biogenic volatile organic compounds emissions missing from current fire emissions estimate should be included in the future.
机译：2007年2月28日，乔治亚州亚特兰大市发生了由规定的森林火灾引起的严重烟雾事件。乔治亚州-佛罗里达州野生森林大火在美国东南部大都市地区引起的稍后烟雾事件进一步放大了森林大火排放的重要性以及能够准确预测此类事件的益处。通过使用预燃信息，我们利用运行预测系统来模拟2月28日发生的两次大火对空气质量的潜在影响。我们的“预测”预测，预定的明火将导致超过100万亚特兰大居民暴露于下午4点后达到35μgm〜（-3）或更高的细颗粒物（PM2.5）水平。到午夜。模拟峰1 h PM2.5浓度约为121μgm〜（-3）。我们的研究表明，当前的空气质量预测技术可以成为有助于管理火灾活动以保护公众健康的有用工具。利用后燃烧信息，我们的“后播”预测在时间和位置上均显着改善，在峰值上略有改善。 “ Hindcast”模拟还表明，大火暂时触发的松树物种释放的其他类异戊二烯可能会在冬季后期迅速引起臭氧和次生有机气溶胶的形成。这项研究的结果表明，未来的火灾排放估算中缺少的火灾引起的生物挥发性有机化合物的排放应包括在内。

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