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首页> 外文期刊>Environmental Science & Technology >Contribution of Wildland-Fire Smoke to US PM_(2.5)and Its Influence on Recent Trends
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Contribution of Wildland-Fire Smoke to US PM_(2.5)and Its Influence on Recent Trends

机译：荒地火灾烟雾对美国PM_（2.5）的贡献及其对近期趋势的影响

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摘要

Seasonal-mean concentrations of particulate matter with diameters smaller than 2.5 mu m (PM2.5) have been decreasing across the United States (US) for several decades, with large reductions in spring and summer in the eastern US. In contrast, summertime-mean PM2.5 in the western US has not significantly decreased. Wildfires, a large source of summertime PM2.5 in the western US, have been increasing in frequency and burned area in recent decades. Increases in extreme PM2.5 events attributable to wildland fires have been observed in wildfire-prone regions, but it is unclear how these increases impact trends in seasonal-mean PM2.5. Using two distinct methods, (1) interpolated surface observations combined with satellite-based smoke plume estimates and (2) the GEOS-Chem chemical transport model (CTM), we identify recent trends (2006-2016) in summer smoke, nonsmoke, and total PM2.5 across the US. We observe significant decreases in nonsmoke influenced PM2.5 in the western US and find increases in summer-mean smoke PM2.5 in fire-prone regions, although these are not statistically significant due to large interannual variability in the abundance of smoke. These results indicate that without the influence of wildland fires, we would expect to have observed improvements in summer fine particle pollution in the western US but likely weaker improvements than those observed in the eastern US.
机译：在美国（美国）几十年来，直径小于2.5微米（PM2.5）的颗粒物的季节性平均浓度一直在下降，而在美国东部的春季和夏季则有很大的减少。相反，在美国西部，夏季平均PM2.5并未显着下降。野火是美国西部夏季PM2.5的主要来源，近几十年来，野火的发生频率和燃烧面积一直在增加。在容易发生野火的地区，已观察到由野火引起的极端PM2.5事件增加，但目前尚不清楚这些增加如何影响季节性平均PM2.5。使用两种不同的方法，（1）内插表面观测与基于卫星的烟羽估计相结合，以及（2）GEOS-Chem化学迁移模型（CTM），我们确定了夏季烟雾，无烟和无烟的近期趋势（2006-2016）。全美国的PM2.5总量。我们观察到在美国西部，受非烟影响的PM2.5显着下降，并且在易火地区发现了夏季平均烟气PM2.5的增加，尽管由于大量烟气的年际变化较大，这些在统计上并不显着。这些结果表明，在没有野火的影响的情况下，我们期望美国西部地区夏季细颗粒物污染有所改善，但改善程度可能比美国东部地区弱。

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  • 来源
    《Environmental Science & Technology》 |2019年第4期|1797-1804|共8页
  • 作者

    ODell Katelyn; Ford Bonne; Fischer Emily V.; Pierce Jeffrey R.;

  • 作者单位

    Colorado State Univ, Dept Atmospher Sci, 200 West Lake St,1371 Campus Delivery, Ft Collins, CO 80523 USA;

    Colorado State Univ, Dept Atmospher Sci, 200 West Lake St,1371 Campus Delivery, Ft Collins, CO 80523 USA;

    Colorado State Univ, Dept Atmospher Sci, 200 West Lake St,1371 Campus Delivery, Ft Collins, CO 80523 USA;

    Colorado State Univ, Dept Atmospher Sci, 200 West Lake St,1371 Campus Delivery, Ft Collins, CO 80523 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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