Short-term ice speed variations in an Antarctic outlet glacier

为了更好地了解南极出口冰川的流量变化及其控制机制，我们对位于Syowa站附近的Langhovde冰川进行了GPS测量。2012年1月至2013年1月，GPS接收机一直在野外运行。因此，除了极夜期间的几个月外，可以获得连续的GPS数据。GPS数据显示受海潮调节的短期流速变化。研究结果表明，Langhovde冰川的冰流量没有出现季节性变化和加速现象，表明其长期冰流量相对稳定。我们的数据提供了对南极出口冰川流量变化的见解。相对稳定的流动状况与Langhovde冰川近期的稳定性一致。这一结果非常重要，因为东南极洲的冰川动态数据很少。

To better understand the flow variation and its controlling mechanism of Antarctic outlet glaciers, we performed GPS measurements on Langhovde Glacier located near Syowa Station. GPS receivers were kept running in the field from January 2012 to January 2013. As a result, continuous GPS data were obtained except for a few months during the polar night. The GPS data showed short-term flow speed variations modulated by the ocean tide. We observed no seasonal flow variations or speed-up events, which indicated relatively stable long-term ice flow of Langhovde Glacier. Our data provide insights into the flow variation of outlet glaciers in Antarctica. The relatively stable flow condition is consistent with the recent stability of Langhovde Glacier. The results are important particularly because data on glacier dynamics are sparse in East Antarctica.