利用ICESat测高数据的东南极Totten冰川流域冰下湖活动监测及水文分析

Water Movement and Hydrological Connections Analysis of the Subglacial Lakes Beneath the Totten Glacier Catchment,East Antarctica Based on ICESat Altimetry Data

利用ICESat/GLA12激光测高数据,使用重复轨道最小二乘平面拟合的方法,计算得到东南极Totten冰川流域Totten1、Totten2和Wilkes1冰下湖在2003-2009年间的高程和水量变化。结合BEDMAP 2数据集生成的水流路径分析冰下湖间的水文联系。结果表明,3个冰下湖在该时间段内有水的持续流动,Totten1和Totten2冰下湖水流入和流出较频繁,Wilkes1冰下湖则在观测时间内水量持续增加。此外,通过分析发现,Totten2冰下湖活动存在周期性。湖水变化特征和冰下水流路径表明这3个冰下湖之间存在一定的关联性。

A least-squares plane fitting of repeat-tracks meth- od based on ICESat altimetry data is proposed to estimate the height and volume change of the Torten1, Torten2 and Wilkes; lakes beneath the Totten Glacier catchment, East and South Antarctica during 2003- 2009. Combining the water drainage pathways generated by BEDMAP 2 dataset, the connections between these lakes are also analyzed. Re- sults show that there are continuous water movement in these three subglaeial lakes. Water drainage and refilling are very frequent in the Tottena and Totten2 subglacial lakes, and the water of Wilkes1 suhglacial lake keep on increasing during the observing time. Moreover, there exists periodic water change of Totten2 subglacial lake. According to the water change and drainage pathways, it can be found that the three lakes are partially connected.