当前位置: X-MOL 学术Atmos. Pollut. Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Improving spatial resolution of PM2.5 measurements during wildfires
Atmospheric Pollution Research ( IF 4.5 ) Pub Date : 2021-03-19 , DOI: 10.1016/j.apr.2021.03.010
Yifan Ding , Isa Cruz , Frank Freedman , Akula Venkatram

This study proposes an approach to improve the spatial resolution of ground-level concentrations of PM2.5 that is required to assess health risks associated with exposure to pollutants released during wildfires. We use this approach to analyze the impact on air quality of the wildfire complex consisting of the Atlas, Nuns, Tubbs, Pocket, and Redwood Valley fires in northern California that started on 8 October 2017 and the Camp Fire in northern California that was first reported on 8 November 2018. The PM2.5 concentrations measured in populated areas downwind of these fires were well above the 24-hour standard of 35 μg/m3 during several days of both fires. To estimate health risks at locations where ground-based monitors did not provide sufficient spatial coverage we first estimate the emissions from the fires by fitting concentration estimates from two models, a Lagrangian model and a segmented plume dispersion model, to corresponding concentrations from ground monitors. We also use a power law model to fit the measured PM2.5 concentrations to the ratio of aerosol optical depth (AOD) to planetary boundary layer measured by the Moderate Resolution Imaging Spectroradiometer (MODIS) carried by NASA's Terra and Aqua satellites. Dispersion model estimates are then combined with estimates from the AOD model to compute ground-level concentrations at a resolution of 1 km. Kriged residuals between estimates from the combined model and measured PM2.5 concentrations are then added to obtain high resolution maps that can be used for exposure studies.



中文翻译:

改善野火期间PM 2.5测量的空间分辨率

本研究提出改善PM的地面浓度的空间分辨率的方法2.5时所需的评估与暴露于野火过程中所释放的污染物相关的健康风险。我们使用这种方法来分析野火综合设施对空气质量的影响,其中包括2017年10月8日开始的加利福尼亚北部的阿特拉斯,尼姑,塔布斯,珀特和雷德伍德山谷大火以及首次报告的加利福尼亚北部的篝火于2018年11月8日。在这些大火的顺风地区测得的PM 2.5浓度远高于24小时标准35μG/3在两天的大火中。为了估算地面监测器无法提供足够空间覆盖范围的地点的健康风险,我们首先通过将两个模型(拉格朗日模型和分段羽流扩散模型)的浓度估算值与地面监测器的相应浓度相拟合来估算火灾的排放量。我们还使用幂定律模型来拟合测得的PM 2.5浓度与NASA Terra和Aqua卫星携带的中等分辨率成像光谱仪(MODIS)测量的气溶胶光学深度(AOD)与行星边界层之比。然后将色散模型估计值与AOD模型的估计值结合起来,以1 km的分辨率计算地面浓度。然后将合并模型的估计值与测得的PM 2.5浓度之间的Kriged残差相加,以获得可用于暴露研究的高分辨率图。

更新日期:2021-03-21
down
wechat
bug