Abstract Equivalent black carbon ( E B C ) mass concentrations in the fine inhalable fraction of airborne particles ( P M 2.5 ) were determined using a 7-wavelength Aethalometer for 17 months, between November 2014 and March 2016, for a suburban location of the Metropolitan Area of Buenos Aires (MABA), Argentina. In addition to describing seasonal and diurnal black carbon (BC) cycles for the first time in this region, the relative contributions of fossil fuel and remote and local biomass burning were determined by distinguishing different carbonaceous components based on their effect on light attenuation for different wavelengths. Trajectory analyses and satellite-based fire products were used to illustrate the impact of long-range transport of particles emitted by non-local sources. EBC data showed a marked diurnal cycle, largely modulated by traffic variations and the height of the boundary layer, and a seasonal cycle with monthly median EBC concentrations (in μ g / m 3 ) ranging from 1.5 (February) to 3.4 (June). Maximum values were found during winter due to the combination of prevailingly stable atmospheric conditions and the increase of fossil fuel emissions, derived primarily from traffic and biomass burning from the domestic use of wood for heating. The use of charcoal grills was also detected and concentrated during weekends. The average contribution of fossil fuel combustion sources to E B C concentrations was 96%, with the remaining 4% corresponding to local and regional biomass burning. During the entire study period, only two events were identified during which E B C concentrations attributed to regional biomass burning accounted for over 50% of total E B C ; these events demonstrate the relevance of agricultural and forestry activities that take place far from the city yet whose emissions can affect the urban atmosphere of the MABA.

中文翻译：

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布宜诺斯艾利斯都市区的本地和远程黑碳源

摘要 在 2014 年 11 月至 2016 年 3 月期间，使用 7 波长风量计测定了布宜诺斯都市区郊区的可吸入细颗粒 (PM 2.5) 中的等效黑碳 (EBC) 质量浓度。艾利斯 (MABA)，阿根廷。除了首次描述了该地区的季节性和昼夜黑碳 (BC) 循环外，化石燃料与偏远和当地生物质燃烧的相对贡献是通过区分不同碳质成分对不同波长光衰减的影响来确定的. 轨迹分析和基于卫星的火灾产品被用来说明非本地源排放的粒子长距离传输的影响。EBC 数据显示明显的昼夜循环，很大程度上受交通变化和边界层高度的影响，以及每月 EBC 浓度中值（以 μ g / m 3 为单位）范围从 1.5（二月）到 3.4（六月）的季节性周期。由于普遍稳定的大气条件和化石燃料排放的增加（主要来自交通和家庭使用木材取暖的生物质燃烧），在冬季发现了最大值。木炭烤架的使用也被发现并集中在周末。化石燃料燃烧源对 EBC 浓度的平均贡献为 96%，其余 4% 对应于当地和区域的生物质燃烧。在整个学习期间，仅确定了两个事件，其中归因于区域生物质燃烧的 EBC 浓度占 EBC 总量的 50% 以上；这些事件证明了远离城市的农业和林业活动的相关性，但这些活动的排放会影响 MABA 的城市大气。