Abstract. Biomass burning releases large amounts of aerosols and chemical species into the atmosphere, representing a major source of air pollutants. Emissions and by-products can be transported over long distances, presenting challenges in quantification. This is mainly done using satellites, which offer global coverage and data acquisition for places that are difficult to access. In this study, ground-based observations are used to assess the abundance of trace gases and aerosols. On 24 November 2020, a significant increase in formaldehyde was observed with a Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) instrument located in Montevideo (Uruguay), and its vertical column densities reached values of 2.4×1016 molec. cm−2, more than twice the values observed during the previous days. This was accompanied by an increase in the aerosol levels measured by an AErosol RObotic NETwork (AERONET) photometer located at the same site. The aerosol optical depth (AOD) at 440 nm reached values close to 1, an order of magnitude larger than typical values in Montevideo. Our findings indicate that the increase was associated with the passage of a plume originating from distant biomass burning. This conclusion is supported by TROPOspheric Monitoring Instrument (TROPOMI) satellite observations as well as HYbrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) simulations. The profiles of the gases and aerosols retrieved from the MAX-DOAS observations are consistent with the HYSPLIT analysis, showing the passage of a plume over Montevideo on 24 November located at a height of ∼ 1.5 km. This corroborates the finding that biomass burning events occurring about 800 km north of Montevideo can affect the local atmosphere through long-distance emissions transport. This study underscores the potential of ground-based atmospheric monitoring as a tool for detection of such events. Furthermore, it demonstrates greater sensitivity compared to satellite when it comes to detection of relatively small amounts of carbonyls like glyoxal and formaldehyde.

中文翻译：

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测量报告：乌拉圭蒙得维的亚结合使用 MAX-DOAS 和 AERONET 地面测量来检测远处生物质燃烧


摘要。生物质燃烧会向大气中释放大量气溶胶和化学物质，是空气污染物的主要来源。排放物和副产品可以长距离运输，这给量化带来了挑战。这主要是使用卫星来完成的，卫星可以提供全球覆盖并为难以到达的地方提供数据采集。在这项研究中，利用地面观测来评估痕量气体和气溶胶的丰度。 2020 年 11 月 24 日，位于乌拉圭蒙得维的亚的多轴差分光学吸收光谱 (MAX-DOAS) 仪器观察到甲醛含量显着增加，其垂直柱密度达到 2.4×1016molec。 cm−2，是前几天观察到的值的两倍多。与此同时，位于同一地点的气溶胶机器人网络 (AERONET) 光度计测量到的气溶胶水平也随之增加。 440 nm 处的气溶胶光学深度 (AOD) 达到接近 1 的值，比蒙得维的亚的典型值大一个数量级。我们的研究结果表明，这种增加与远处生物质燃烧产生的羽流的通过有关。这一结论得到了对流层监测仪器 (TROPOMI) 卫星观测以及混合单粒子拉格朗日积分轨迹 (HYSPLIT) 模拟的支持。从 MAX-DOAS 观测中检索到的气体和气溶胶的剖面与 HYSPLIT 分析一​​致，显示 11 月 24 日有一股羽流在蒙得维的亚上空经过，高度为 ∼ 1.5 km。这证实了蒙得维的亚以北约 800 公里处发生的生物质燃烧事件可以通过长距离排放传输影响当地大气的发现。 这项研究强调了地面大气监测作为检测此类事件的工具的潜力。此外，在检测乙二醛和甲醛等相对少量的羰基化合物时，与卫星相比，它表现出更高的灵敏度。