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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Dual polarisation C-band weather radar imagery of the 6 August 2012 Te Maari Eruption, Mount Tongariro, New Zealand
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Dual polarisation C-band weather radar imagery of the 6 August 2012 Te Maari Eruption, Mount Tongariro, New Zealand

机译：2012年8月6日蒂马里喷发的双极化C波段天气雷达图像，新西兰汤加里罗

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The 6 August 2012 eruption of Mt. Tongariro from Upper Te Maari Crater in the central North Island of New Zealand was the first volcanic eruption observed by an operational weather radar in New Zealand, and is believed to be one of only a small number of eruptions observed by a dual-polarisation radar worldwide. The eruption was also observed by a GeoNet webcam, and detailed ash deposit studies have permitted analysis of the plume characteristics. A combination of radar and webcam imagery show 5 pulses within the first 13 min of the eruption, and also the subsequent ash transport downwind. Comparison with ash samples show the radar was likely detecting ash particles down to about 0.5 mm diameter. The maximum plume height estimated by the radar is 7.8 ± 1.0 km above mean sea level (amsl), although it is possible this may be a slight under estimation if very small ash particles not detected by the radar rose higher and comprised the very top of the plume. The correlation coefficient and differential reflectivity fields that are additionally measured by the dual polarisation radar provide extra information about the structure and composition of the eruption column and ash cloud. The correlation coefficient easily discriminates between the eruption column and the ash plume, and provides some information about the diversity of ash particle size within both the ash plume and the subsequent detached ash cloud drifting downwind. The differential reflectivity shows that the larger ash particles are falling with a horizontal orientation, and indicates that ice nucleation and aggregation of fine ash particles was probably occurring at high altitudes within 20-25 min of the eruption.
机译：2012年8月6日。来自新西兰北岛中部特马里火山口上层的汤加里罗（Tongariro）是纽西兰运行的气象雷达首次观测到的火山喷发，并且被认为是全球双极化雷达观测到的少数喷发之一。 。 GeoNet网络摄像头还观察到了喷发，并且详细的灰烬沉积研究允许对羽状特征进行分析。雷达和网络摄像头图像的组合在喷发的前13分钟内显示了5个脉冲，随后还向顺风方向输送了灰烬。与粉尘样品的比较表明，雷达很可能检测到直径约0.5毫米的粉尘颗粒。雷达估计的最大羽流高度比平均海平面（amsl）高7.8±1.0 km，但是如果雷达未检测到的非常小的灰烬颗粒上升得更高并且位于雷达的最顶部，则可能会略有不足。羽毛。双极化雷达额外测量的相关系数和差分反射率场提供了有关喷发柱和灰云的结构和成分的额外信息。相关系数可以轻松地区分喷发柱和烟灰羽，并提供一些有关烟灰羽和随后分离的灰云顺风飘移的灰粒大小多样性的信息。差示反射率表明较大的灰烬颗粒以水平方向下落，并表明在喷发20-25分钟内的高空可能发生了冰核和细小的灰烬颗粒的聚集。

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