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引用次数: 1
摘要
在这里,我们使用各种遥感数据集来描述斯普利特湖冰川的演变范围、表面特征、动力学和表面海拔,斯普利特湖是努纳武特威尔士亲王冰原的一个小出口。冰川在1959年至1975年间开始推进,直到今天,终点面积仍在持续增加,同时出现了无法通过表面质量平衡来解释的显著的高海拔变薄和低海拔变厚。最高速度达到>600 m yr-1,冰运动最快的区域集中在基岩收缩处的冰瀑周围。1975年的一张冰川空中照片中首次出现了独特的拱形,这表明冰川的快速运动始于1970年。与威尔士亲王西部冰原附近所有其他地区的几何形状、速度和面积变化相比,这些模式是异常的,表明斯普利特湖冰川可能是一个缓慢上升的冰川。50多年的涌浪持续时间比之前描述的加拿大北极群岛内的任何其他涌浪都要长。这些结果为该地区冰川的各种动态和几何变化提供了进一步的信息。
Anomalous surface elevation, velocity and area changes of Split Lake Glacier, western Prince of Wales Icefield, Canadian High Arctic
Here we use a variety of remote sensing datasets to characterize the evolving extent, surface features, dynamics and surface elevations of Split Lake Glacier, a small outlet of the Prince of Wales Icefield, Nunavut. The glacier started advancing between 1959 and 1975, with a continued increase in terminus area up to present day, coincident with significant upper elevation thinning and lower elevation thickening that cannot be accounted for by surface mass balance. The highest velocities reach >600 m yr-1, with the region of fastest ice motion focused around an icefall that occurs in a bedrock constriction. Distinctive ogives are present in a 1975 air photo of the glacier for the first time, which suggests that rapid motion started by 1970. These patterns are anomalous when compared with the geometry, velocity and area changes of all other nearby areas of western Prince of Wales Icefield and suggest that Split Lake Glacier may be a slowly surging glacier. The surge duration of 50+ years is longer than any other previously described surge within the Canadian Arctic Archipelago. These results give further information concerning the wide variety of dynamic and geometrical changes of glaciers across this region.
Arctic ScienceAgricultural and Biological Sciences-General Agricultural and Biological Sciences
CiteScore
5.00
自引率
12.10%
发文量
81
期刊介绍:
Arctic Science is an interdisciplinary journal that publishes original peer-reviewed research from all areas of natural science and applied science & engineering related to northern Polar Regions. The focus on basic and applied science includes the traditional knowledge and observations of the indigenous peoples of the region as well as cutting-edge developments in biological, chemical, physical and engineering science in all northern environments. Reports on interdisciplinary research are encouraged. Special issues and sections dealing with important issues in northern polar science are also considered.