美国西部野火气溶胶的粒径分布。

IF 2.8 Q3 ENVIRONMENTAL SCIENCES
Siying Lu, Chiranjivi Bhattarai, Vera Samburova and Andrey Khlystov
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引用次数: 0

摘要

野火是美国西部夏季气溶胶的主要来源。野火排放的气溶胶可能会严重影响空气质量、人类健康和全球气候。本研究对野火烟雾影响日和非烟雾影响日的气溶胶特征进行了比较。环境粒径分布(PSD)数据于2017年7月至2020年10月在内华达州里诺收集。在此期间,该地点受到一百多起野火的烟雾的影响,这些野火发生在美国西部距离测量地点不同的生态系统中。通过卫星图像、危害测绘系统和风的反向轨迹来确定受烟雾影响的天数。采用正矩阵分解法(PMF)识别主要干扰源及其特征。野火气溶胶的数模直径为212 nm,明显大于非烟雾影响日的气溶胶(61 nm)。除了颗粒大小的增加,野火对PM2.5和CO浓度也有很大的贡献。在2016年至2021年的火灾多发月份(7月、8月和9月),研究区域56%至65%的PM2.5和18%至26%的CO浓度可归因于野火排放。按年计算,野火排放占PM2.5浓度的35%至47%,占CO浓度的5%至12%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Particle size distributions of wildfire aerosols in the western USA†

Particle size distributions of wildfire aerosols in the western USA†

Wildfires are a major source of aerosols during summer in the western United States. Aerosols emitted from wildfires could significantly affect air quality, human health, and the global climate. This study conducted a comparison of aerosol characteristics during wildfire smoke-influenced and non-smoke-influenced days. Ambient particle size distribution (PSD) data were collected in Reno, Nevada, between July 2017 and October 2020. During this period, the site was impacted by smoke from over a hundred wildfires burning in a wide range of ecosystems in the western United States located at different distances from the measurement site. The smoke-influenced days were identified using satellite images, a hazard mapping system, and wind back-trajectory. Positive matrix factorization (PMF) was applied to identify the main sources and their characteristics. The wildfire aerosols were observed to have a number mode diameter of 212 nm, which is significantly larger than aerosols on non-smoke-influenced days (61 nm). In addition to the increase in particle size, wildfires made a large contribution to PM2.5 and CO concentrations. During fire-prone months (July, August, and September) from 2016 to 2021, 56% to 65% of PM2.5 and 18% to 26% of CO concentrations could be attributed to wildfire emissions in the study area. On an annual basis, wildfire emissions were responsible for 35% to 47% of PM2.5 concentrations and 5% to 12% of CO concentrations.

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