...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Interannual Variations in PM2.5 due to Wildfires in the Western United States
【24h】

Interannual Variations in PM2.5 due to Wildfires in the Western United States

机译：美国西部因野火引起的PM2.5的年际变化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this study we have evaluated the role of wildfires on concentrations of fine particle [d < 2.5 μm) organic carbon (OC) and paniculate mass (PM2.5) in the Western United States for the period 1988-2004. To do this, we examined the relationship between mean summer PM2.5 and OC concentrations at 39 IMPROVE sites with a database of fires developed from federal fire reports. The gridded database of area burned was used to generate a database of biomass fuel burned using ecosystem-specific fuel loads. The OC, PM2.5, and fire data were evaluated for five regions: Northern Rocky Mountains (Region 1), Central Rocky Mountains (Region 2), Southwest (Region 3), California (Region 4), and Pacific Northwest (Region 5}. In Regions 1, 2, and 5, we found good correlations of seasonal mean PM2.5 concentrations among the sites within each region. This indicates that a common influence was important in determining the PM concentration at all sites across each region. In Regions 1 and 2, we found a significant correlation between PM2.5 and both the area burned and biomass fuel burned in each region. This relationship is statistically significant using either the area burned or fuel burned, but the correlations are stronger using the biomass fuel burned. In all five regions we found a statistically significant relationship between biomass burned and organic carbon. Using these relationships, we can estimate the amount of PM2.5 due to fires in each region during summer. For the Regions 1 through 5, the average summer-long enhancement of PM2.5 due to fires is 1.84, 1.09, 0.61, 0.81, and 1.21 μg/m~3, respectively, and approximately twice these values during large fire years.
机译：在这项研究中，我们评估了野火对1988-2004年期间美国西部细颗粒[d <2.5μm]有机碳（OC）和颗粒质量（PM2.5）浓度的作用。为此，我们检查了39个IMPROVE站点夏季平均PM2.5与OC浓度之间的关系，并使用了根据联邦火灾报告开发的火灾数据库。燃烧面积的网格化数据库用于生成使用特定于生态系统的燃料负荷燃烧的生物质燃料的数据库。对五个地区的OC，PM2.5和火灾数据进行了评估：北部洛矶山脉（1区），中部洛矶山脉（2区），西南（3区），加利福尼亚（4区）和西北太平洋（5区） }。在1区，2区和5区，我们发现每个区域内各站点之间的PM2.5季节性平均浓度具有良好的相关性，这表明在确定每个区域内所有站点的PM浓度方面，共同的影响很重要。在区域1和2中，我们发现PM2.5与每个区域的燃烧面积和生物质燃料燃烧之间都具有显着相关性，无论是燃烧面积还是燃料燃烧，该关系均具有统计学意义，但使用生物质燃料则相关性更强在所有五个区域中，我们发现生物质燃烧与有机碳之间存在统计上的显着关系，利用这些关系，我们可以估算夏季每个区域因火灾而产生的PM2.5量。1至5区夏季由于火灾引起的PM2.5的平均平均增强分别为1.84、1.09、0.61、0.81和1.21μg/ m〜3，在大火灾年份约为这些值的两倍。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号