Multidisciplinary Institute of Plant Biology (Pollution and Bioindicators Area) National Scientific and Technical Research Council (IMBIV-CONICET), Faculty of Physical and Natural Sciences, National University of Córdoba (FCEFyN-UNC), 1611 Vélez Sarsfield Avenue, X5016CGA, Córdoba, Argentina.
Arch Environ Contam Toxicol. 2019 Aug;77(2):171-179. doi: 10.1007/s00244-019-00618-9. Epub 2019 Mar 28.
Extreme environmental events, such as forest fires, are a major emission source of aerosols into the atmosphere. Thus, to investigate the contribution of local forest fires to urban particulate matter, we selected several forest fire indicators, such as number of heat sources, fire events, and burnt area, and collected particles smaller than 2.5 µm (PM) during a 2.5-year period in Cordoba City (Argentina). Temporal variation of PM concentration and composition was described considering fire and nonfire periods, and the influence of meteorological variables was estimated as well. On average, PM levels registered in Córdoba city during the study period were lower than values reported for other similar cities in Latin America, despite the fact that during wintertime an increase in PM levels was observed due to the occurrence of thermal inversions. Several fire events taking place in the nearby hills around the city during winter and spring 2013 suggest that biomass burning was a strong contribution to urban particles levels, which is consistent with the significant correlation between PM concentration and heat sources number. During fire periods, levels of Fe, Ca, and K, were significantly higher than in the nonfire periods, suggesting that these elements can be reliable forest fire markers.
极端环境事件，如森林火灾，是大气气溶胶的主要排放源之一。因此，为了研究当地森林火灾对城市颗粒物的贡献，我们选择了几个森林火灾指标，如热源数量、火灾事件和燃烧面积，并在阿根廷科尔多瓦市采集了 2.5 年期间小于 2.5μm 的颗粒物（PM）。考虑到火灾和非火灾时期，描述了 PM 浓度和成分的时间变化，并估算了气象变量的影响。平均而言，在研究期间，科尔多瓦市的 PM 水平低于拉丁美洲其他类似城市的报告值，尽管在冬季由于逆温的发生，PM 水平有所增加。2013 年冬季和春季，城市附近山丘上发生的几次火灾事件表明，生物质燃烧是城市颗粒物水平的一个重要贡献因素，这与 PM 浓度与热源数量之间的显著相关性一致。在火灾期间，Fe、Ca 和 K 的浓度明显高于非火灾期间，表明这些元素可以作为可靠的森林火灾标志物。
