Ice-volume changes, bias estimation of mass-balance measurements and changes in subglacial lakes derived by lidar mapping of the surface of Icelandic glaciers
Ice-volume changes, bias estimation of mass-balance measurements and changes in subglacial lakes derived by lidar mapping of the surface of Icelandic glaciers
复制标题
冰量变化、质量平衡测量的偏差估计以及通过冰岛冰川表面激光雷达测绘得出的冰下湖泊变化
作者：
T. Jóhannesson;H. Björnsson;E. Magnússon;S. Guðmundsson;F. Pálsson;O. Sigurðsson;T. Thorsteinsson;E. Berthier
冰岛冰川面积11000 km 2，冰储量3600 km 3。从2008年国际极地年开始，使用机载激光雷达制作冰川的精确数字高程模型（DEM）。超过90%的冰川已经被调查，包括瓦特纳冰川，霍夫斯冰盖，默达尔斯冰盖，德兰加冰盖，埃亚菲亚德拉冰盖和几个较小的冰川。公开的数字高程模型可用于冰川学和地质学研究，包括冰量变化研究、质量平衡测量偏差估计、冰下地热区形成的jökulhlaups和冰下湖泊研究，以及裂缝测绘。激光雷达测绘包括一个500-1000米宽的无冰缓冲区周围的冰缘，其中包含许多冰川地貌特征，因此，新的DEM已被证明是有用的地质调查的冰前地区。激光雷达数字高程模型与旧地图的比较证实了冰岛冰盖的快速持续体积变化，自1995/96年以来，质量平衡测量显示了这一点。在某些情况下，通过比较激光雷达测量与旧DEM得出的冰量变化与传统质量平衡测量得出的累积冰量变化吻合良好，但在其他情况下，这种比较表明传统质量平衡记录存在重大偏差。
Abstract Icelandic glaciers cover ∼11 000 km2 in area and store ∼3600 km3 of ice. Starting in 2008 during the International Polar Year, accurate digital elevation models (DEMs) of the glaciers are being produced with airborne lidar. More than 90% of the glaciers have been surveyed in this effort, including Vatnajökull, Hofsjökull, Myrdalsjökull, Drangajökull, Eyjafjallajökull and several smaller glaciers. The publicly available DEMs are useful for glaciological and geological research, including studies of ice-volume changes, estimation of bias in mass-balance measurements, studies of jökulhlaups and subglacial lakes formed by subglacial geothermal areas, and for mapping of crevasses. The lidar mapping includes a 500-1000 m wide ice-free buffer zone around the ice margins which contains many glacio-geomorphological features, and therefore the new DEMs have proved useful in geological investigations of proglacial areas. Comparison of the lidar DEMs with older maps confirms the rapid ongoing volume changes of the Icelandic ice caps which have been shown by mass-balance measurements since 1995/96. In some cases, ice-volume changes derived by comparing the lidar measurements with older DEMs are in good agreement with accumulated ice-volume changes derived from traditional mass-balance measurements, but in other cases such a comparison indicates substantial biases in the traditional mass-balance records.
使用激光扫描导出的地面控制点优化摄影测量 DEM 以进行冰川体积变化评估
影响因子：
3.4
作者：
Barrand N
通讯作者：
Barrand N