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首页> 外文期刊>Journal of Glaciology >Controls on short-term variations in Greenland glacier dynamics
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Controls on short-term variations in Greenland glacier dynamics

机译：格陵兰冰川动力学短期变化的控制

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摘要

Short-term ice-dynamical processes at Greenland's Jakobshavn and Kangerdlugssuaq glaciers were studied using a 3 day time series of synthetic aperture radar data acquired during the 2011 European Remote-sensing Satellite-2 (ERS-2) 3 day repeat campaign together with modelled meteorological parameters. The time series spans the period March-July 2011 and captures the first ~30% of the summer melting season. In both study areas, we observe velocity fluctuations at the lower ~10 km of the glacier. At Jakobshavn Isbr?, where our dataset covers the first part of the seasonal calving-front retreat, we identify ten calving episodes, with a mean calving-front area loss of 1.29 ±0.4 km2. Significant glacier speed-up was observed in the near-terminus area following all calving episodes. We identify changes in calving-front geometry as the dominant control on velocity fluctuations on both glaciers, apart from a <15% early-summer speed-up at Kangerdlugssuaq Glacier during a period of calving-front advance, which we attribute to enhanced surface melt-induced basal lubrication. Our 3 day velocity maps show new spatial characteristics of the ice melange flow variability in the Jakobshavn and Kangerdlugssuaq fjord systems, which are primarily controlled by calving-front dynamics and fjord geometry.
机译：使用在2011年欧洲遥感卫星2（ERS-2）3天重复运动中获得的3天时间合成孔径雷达数据以及模拟气象条件，研究了格陵兰Jakobshavn和Kangerdlugssuaq冰川的短期冰动力过程。参数。该时间序列跨度为2011年3月至7月，捕获了夏季融化季节的前30％。在这两个研究区域中，我们都观察到冰川下约10 km处的速度波动。在Jakobshavn Isbr ?，我们的数据集涵盖了季节性产犊前撤的第一部分，我们确定了十次产犊事件，平均产犊前面积损失为1.29±0.4 km2。所有产犊事件发生后，在近端区域观察到明显的冰川加速。我们确定了前弯角几何形状的变化是这两个冰川速度波动的主要控制因素，除了在前弯角前进期间Kangerdlugssuaq冰川的夏初提速<15％外，我们将其归因于表面融化的增强诱导的基础润滑。我们的三日速度图显示了雅各布港和肯格勒格苏阿格峡湾系统中冰混合物流变率的新空间特征，这些特征主要由前锋动力学和峡湾几何形状控制。

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