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首页> 外文期刊>International journal of remote sensing >Monitoring Active Subglacial Volcanoes: A Case Study Using Airborne Remotely Sensed Imagery Of Grimsvoetn, Iceland
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Monitoring Active Subglacial Volcanoes: A Case Study Using Airborne Remotely Sensed Imagery Of Grimsvoetn, Iceland

机译：监测活跃的冰川下火山：使用格里姆斯沃特恩，冰岛的机载遥感影像的案例研究

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摘要

Grimsvoetn is located beneath Vatnajokull, Europe's largest temperate ice cap. As a part of ongoing research on heat flux, morphological changes and volcanic processes at Grimsvotn, Airborne Thematic Mapper (ATM) imagery and aerial photographs were acquired in 2001. The thermal images illuminated distinct areas of geothermal activity along the southern caldera wall. In combination with meteorological data the images were used to estimate surface temperatures and heat flux from patches of open water along the margin of the ice shelf covering the Grimsvoetn subglacial lake. It was found that water temperatures varied from 0℃ to ～45℃ and that the heat flux to the atmosphere from open water varied from slightly negative values (net energy gain) up to 1000 Wm~(-2). The total heat output from the ～0.1 km~2 of open water was estimated as ～18 MW, about 1% of the base heat output of Grimsvoetn. The aerial photographs were used to produce geomorphological maps of the caldera wall, including areas that cannot be safely mapped from the ground. This work indicates that thermal imagery can be an important supplement to ground-based measurements, and that combined optical and thermal remote sensing is a useful tool for spatially detailed monitoring of inaccessible and partly ice-covered volcanoes.
机译：Grimsvoetn位于欧洲最大的温带冰帽Vatnajokull下方。作为正在进行的对格里姆斯沃特热通量，形态变化和火山过程的研究的一部分，2001年获取了机载专题贴图（ATM）图像和航拍照片。这些热图像照亮了南部火山口壁上不同的地热活动区域。与气象数据结合使用，这些图像被用于估计覆盖格里姆斯沃特冰川下冰架边缘的冰水边缘的开阔水面的表面温度和热通量。结果表明，水温从0℃到〜45℃不等，开放水向大气的热通量从略有负值（净能量增益）变化到1000 Wm〜（-2）。约0.1 km〜2的开阔水域的总热量输出估计为〜18 MW，约占格里姆斯沃特基本热量输出的1％。航拍照片被用来制作破火山口墙的地貌图，包括无法从地面安全地测绘的区域。这项工作表明，热成像可以作为对地面测量的重要补充，并且光学和热遥感相结合是对无法访问且部分被冰覆盖的火山进行空间详细监视的有用工具。

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