Abstract A dust plume rising to a maximum altitude of about 1 km above the springtime high-Arctic terrain of Lake Hazen, Nunavut, Canada was detected using a diverse array of passive and active, satellite-based remote sensing techniques. We were able to broadly characterize the 532 nm optical depth and particle size of the upper plume (0.5 ± 0.2 and 15–25 μm radius limits respectively). To our knowledge this is the first satellite-based remotely sensed, overland capture of what is an ubiquitous aeolian process across the Arctic: drainage winds inducing dust plumes that are funneled along basin pathways to spread over the water and land surfaces at the outlets of those pathways. The identification and characterization of the Lake Hazen plume was challenging given that there is little development of passive and active remote sensing techniques over Arctic terrains. Our findings suggest that Arctic-adapted RS techniques that incorporate a priori information on dust optical properties can be exploited to identify and characterize locally generated plumes.

中文翻译：

---

对 Hazen 湖（埃尔斯米尔岛，努纳武特，加拿大）上空的高北极局部沙尘事件的遥感

摘要 使用多种被动和主动、基于卫星的遥感技术探测到了升至加拿大努纳武特哈森湖春季高北极地形上方约 1 公里的最大高度的尘羽。我们能够广泛地表征上羽流的 532 nm 光学深度和粒度（分别为 0.5 ± 0.2 和 15–25 μm 半径限制）。据我们所知，这是第一次基于卫星的遥感、陆上捕获整个北极无处不在的风成过程：排水风引起的尘羽沿着盆地路径汇集，散布在那些出口处的水和陆地表面。途径。鉴于北极地形上的被动和主动遥感技术几乎没有发展，因此黑森湖羽流的识别和表征具有挑战性。我们的研究结果表明，可以利用结合了灰尘光学特性的先验信息的适应北极的 RS 技术来识别和表征局部产生的羽流。