Leveraging the concept of atmospheric rivers (ARs), a detection technique based on a widely utilized global algorithm to detect ARs (Guan and Waliser, 2019, 2015; Guan et al., 2018) was recently developed to detect aerosol atmospheric rivers (AARs) using the Modern-Era Retrospective analysis for Research and Applications, version 2 (MERRA-2) reanalysis (Chakraborty et al., 2021a). The current study further characterizes and quantifies various details of AARs that were not provided in that study, such as the AARs' seasonality, event characteristics, vertical profiles of aerosol mass mixing ratio and wind speed, and the fraction of total annual aerosol transport conducted by AARs. Analysis is also performed to quantify the sensitivity of AAR detection to the criteria and thresholds used by the algorithm. AARs occur more frequently over, and typically extend from, regions with higher aerosol emission. For a number of planetary-scale pathways that exhibit large climatological aerosol transport, AARs contribute up to a maximum of 80 % to the total annual transport, depending on the species of aerosols. Dust (DU) AARs are more frequent in boreal spring, sea salt AARs are often more frequent during the boreal winter (summer) in the Northern (Southern) Hemisphere, carbonaceous (CA) AARs are more frequent during dry seasons, and often originate from the global rainforests and industrial areas, and sulfate AARs are present in the Northern Hemisphere during all seasons. For most aerosol types, the mass mixing ratio within AARs is highest near the surface. However, DU and CA AARs over or near the African continent exhibit peaks in their aerosol mixing ratio profiles around 700 hPa. AAR event characteristics are mostly independent of species with the mean length, width, and length $/$ width ratio around 4000 km, 600 km, and 7–8, respectively.

中文翻译：

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气溶胶大气河流：气候学、事件特征和检测算法敏感性

利用大气河流 (ARs) 的概念，最近开发了一种基于广泛使用的全球算法来检测 AR (Guan 和 Waliser, 2019, 2015; Guan 等人, 2018) 的检测技术来检测气溶胶大气河流 (AAR)使用用于研究和应用的现代回顾分析，第 2 版 (MERRA-2) 再分析（Chakraborty 等人，2021a）。目前的研究进一步表征和量化了该研究中未提供的 AAR 的各种细节，例如 AAR 的季节性、事件特征、气溶胶质量混合比和风速的垂直剖面，以及由AAR。还执行分析以量化 AAR 检测对算法使用的标准和阈值的敏感性。AAR 更频繁地发生在 并且通常从具有较高气溶胶排放的区域延伸。对于许多表现出大量气候气溶胶传输的行星尺度路径，根据气溶胶的种类，AAR 对年度总传输的贡献最多可达 80%。沙尘（DU）AARs在北方春季更频繁，海盐AARs通常在北（南）半球的北方冬季（夏季）更频繁，碳质（CA）AARs在旱季更频繁，并且通常起源于全球热带雨林和工业区，硫酸盐 AARs 存在于北半球所有季节。对于大多数气溶胶类型，AAR 内的质量混合比在地表附近最高。然而，非洲大陆上空或附近的 DU 和 CA AAR 在 700 hPa 左右的气溶胶混合比分布中表现出峰值。 $/$ 宽度比分别约为 4000 公里、600 公里和 7-8。