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Detection of ice mass variation using gnss measurements at Svalbard

机译:使用斯瓦尔巴特群岛的GNSS测量检测冰块变化

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摘要

We compare observed uplift rates of Global Navigation Satellite Systems (mess) with geophysical predictions at sites located on Spitsbergen. We show here that using modern postglacial rebound models, realistic mass balance for Present Day Ice Melting (PDIM) and taking the deglaciation of the Little Ice Age (LIA) into account, we can close the overall uplift budget at a level of a few millimetres per year. For this study we used GNSS data from well-established geodetic sites in Ny-(A) under circle lesund and the new data from Hornsund. The significant increase of uplift rates since the beginning of 2011 was observed at both GNSS sites. These height changes are attributed to recent increased ice mass loss of 6.0 Gt yr(-1) for Svalbard. The total mass loss is estimated at 14.7 Gt yr(-1). Ice unloading caused also a noticeable increase of distance between Ny-(A) under circle lesund and Hornsund. We show that the specific location of the two sites facilitates inference of differential mass loss within the Svalbard Archipelago.
机译:我们将位于斯匹次卑尔根(Spitsbergen)站点的全球导航卫星系统(mess)观测到的上升速率与地球物理预测值进行了比较。我们在这里表明,使用现代冰川后回弹模型,当今冰融化(PDIM)的现实质量平衡以及小冰河时代(LIA)的冰消消融,我们可以将总体隆升预算缩小到几毫米的水平每年。在本研究中,我们使用了来回圆角lesund下来自Ny-(A)成熟的大地测量站点的GNSS数据和来自Hornsund的新数据。自2011年初以来,在两个GNSS站点均观测到上升速率的显着增加。这些高度变化归因于斯瓦尔巴特群岛最近增加了6.0 Gt yr(-1)的冰块损失。总质量损失估计为14.7 Gt yr(-1)。卸冰还导致莱松圆环下方的Ny-(A)与Hornsund之间的距离显着增加。我们表明,这两个站点的特定位置有助于推断斯瓦尔巴群岛内的质量损失。

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