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Eyjafjallaj?kull volcano plume particle-type characterization from space-based multi-angle imaging

机译：Eyjafjallaj？kull火山羽状颗粒的空天多角度成像表征

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摘要

The Multi-angle Imaging SpectroRadiometer (MISR) Research Aerosol algorithm makes it possible to study individual aerosol plumes in considerable detail. From the MISR data for two optically thick, near-source plumes of the spring 2010 Eyjafjallaj?kull volcano eruption, we map aerosol optical depth (AOD) gradients and changing aerosol particle types with this algorithm; several days downwind, we identify the occurrence of volcanic ash particles and retrieve AOD, demonstrating the extent and the limits of ash detection and mapping capability with the multi-angle, multi-spectral imaging data. Retrieved volcanic plume AOD and particle microphysical properties are distinct from background values near-source, as well as for over-water cases several days downwind. The results also provide some indication that as they evolve, plume particles brighten, and average particle size decreases. Such detailed mapping offers context for suborbital plume observations having much more limited sampling. The MISR Standard aerosol product identified similar trends in plume properties as the Research algorithm, though with much smaller differences compared to background, and it does not resolve plume structure. Better optical analogs of non-spherical volcanic ash, and coincident suborbital data to validate the satellite retrieval results, are the factors most important for further advancing the remote sensing of volcanic ash plumes from space.
机译：多角度成像光谱辐射仪（MISR）研究气溶胶算法使研究相当详细的单个气溶胶羽流成为可能。从2010年春季Eyjafjallaj？kull火山喷发的两个光学上较厚的近源羽流的MISR数据中，我们使用该算法绘制了气溶胶光学深度（AOD）梯度并改变了气溶胶颗粒类型。在顺风的几天中，我们识别出火山灰颗粒的发生并取回AOD，用多角度，多光谱的成像数据证明了灰分探测和制图能力的程度和极限。检索到的火山羽的AOD和颗粒的微物理特性与近源背景值以及顺风天数过水的情况都不同。该结果还提供一些迹象，表明随着它们的发展，羽状颗粒变亮，平均粒径减小。这种详细的映射为亚轨道羽流观测提供了更为有限的采样背景。 MISR标准气雾剂产品确定了与研究算法相似的羽流特性趋势，尽管与背景相比差异很小，并且无法解析羽流结构。更好的非球形火山灰光学类似物，以及用于验证卫星检索结果的重合亚轨道数据，是进一步推进从空间遥感火山灰羽流的最重要因素。

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