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，我们在位于Syowa站附近的朗霍夫德冰川上进行了GPS测量。从2012年1月到2013年1月，GPS接收器一直在现场运行。因此，除了极夜期间的几个月外，获得了连续的GPS数据。GPS数据显示了受海潮调制的短期流速变化。我们没有观察到季节性的流量变化或加速事件，这表明朗霍夫德冰川相对稳定的长期冰流。我们的数据提供了对南极洲出口冰川流量变化的洞察。这种相对稳定的流动状态与朗霍夫德冰川近期的稳定性是一致的。这一结果尤其重要，因为有关南极东部冰川动力学的数据很少。

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.