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首页> 外文期刊>Atmospheric chemistry and physics >Eyjafjallaj?kull volcano plume particle-type characterization from space-based multi-angle imaging
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Eyjafjallaj?kull volcano plume particle-type characterization from space-based multi-angle imaging

机译：基于空间多角度成像的Eyjafjallaj？kull火山羽状颗粒类型表征

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The Multi-angle Imaging SpectroRadiometer (MISR) Research Aerosol algorithmmakes it possible to study individual aerosol plumes in considerable detail.From the MISR data for two optically thick, near-source plumes of the spring2010 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 particlesand retrieve AOD, demonstrating the extent and the limits of ash detectionand mapping capability with the multi-angle, multi-spectral imaging data.Retrieved volcanic plume AOD and particle microphysical properties aredistinct from background values near-source, as well as for over-water casesseveral days downwind. The results also provide some indication that as theyevolve, plume particles brighten, and average particle size decreases. Suchdetailed mapping offers context for suborbital plume observations havingmuch more limited sampling. The MISR Standard aerosol product identifiedsimilar trends in plume properties as the Research algorithm, though withmuch smaller differences compared to background, and it does not resolveplume structure. Better optical analogs of non-spherical volcanic ash, andcoincident suborbital data to validate the satellite retrieval results, arethe factors most important for further advancing the remote sensing ofvolcanic ash plumes from space.
机译：多角度成像光谱辐射仪（MISR）的研究气溶胶算法使得可以相当详细地研究单个气溶胶羽流。从2010年春季Eyjafjallaj？kull火山喷发的两个光学厚近源羽流的MISR数据，我们绘制了气溶胶光学深度（AOD）梯度和使用此算法改变的气溶胶颗粒类型;在下风后数天，我们确定火山灰颗粒的出现并检索AOD，通过多角度，多光谱成像数据证明了灰分检测和制图能力的程度和局限性检索到的火山羽的AOD和粒子的微物理特性与近源背景值以及顺风后数天的水上情况都不同。该结果还提供了一些指示，随着旋转，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背景，而亚轨道羽流观测的采样更为有限。 MISR标准气雾剂产品将羽状特性的趋势与研究算法确定为相似的趋势，尽管与背景相比具有较小的差异，并且它不能解析泡沫结构。更好的非球形火山灰光学模拟和重合的亚轨道数据以验证卫星的检索结果，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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