2003—2018年Byrd冰川流域冰下湖活动及水文联系——多源卫星测高数据监测结果分析

doi:10.11947/j.AGCS.2020.20190209

摘要/Abstract

摘要： 南极冰盖下流动水、活跃冰下湖的活动对冰动力学、接地线稳定性和冰盖物质平衡都有重要影响。本文结合ICESat和CryoSat-2测高卫星数据集，分别运用重复轨道法和差分DEM法，对Byrd冰川流域17个活跃冰下湖进行长达16年的监测，并计算其平均高程和平均水量变化，总结活跃冰下湖的水文特征。根据水势方程获取了此区域的冰下排水路径图，结合冰下湖的位置和活动情况分析其相互间的水文联系。结果表明Byrd冰川流域多个活跃冰下湖间存在明显的水文联系：Byrd₁和Byrd₂冰下湖具有以2~3年为周期的储排水活动规律，并且Byrd₁冰下湖主要受到上游Byrd₂冰下湖活动的影响；Byrd_s9和Byrd_s14分别受到上游Byrd_s11和Byrd_s15冰下湖排水的补充，使湖水水量持续上升。

关键词: 卫星测高, 冰下湖, 高程变化, 冰下排水路径, Byrd冰川流域

Abstract: The movement of water beneath the Antarctic ice sheet and the activity of subglacial lakes have important effects on regional ice dynamics, grounding-line stability, and ice sheet mass balance. It is particularly important to monitor activities of subglacial lakes. Combining the ICESat and CryoSat-2 altimeter datasets, the repeat orbit method and differential DEM method were used to monitor the activity of 17 glacial lakes in the Byrd glacier basin for 16 years in this paper. In addition, the variation of average elevation and average water amount of each subglacial lake is calculated, and the hydrological characteristics of subglacial lake activity are summarized. We used the water potential equation to obtain the drainage pathways map in Byrd glacier basin and combined subglacial lake activity to analyze the hydrological relationship among them. Byrd₁ subglacial lake and Byrd₂ subglacial lake both have the periodic pattern of water storage and drainage activities about 2~3 years. Byrd₁ subglacial lake are mainly affected by the activity of upstream Byrd₂ subglacial lake. The water volume of Byrd_s9 subglacial lake and Byrd_s14 subglacial lake kept rising because of supplementary by upstream Byrd_s11 and Byrd_s15 drainage respectively.

Key words: altimetry, subglacial lakes, height change, drainage pathways, Byrd glacier basin

中图分类号:

P228.3
P332

陈俊霖, 周春霞, 赵秋阳. 2003—2018年Byrd冰川流域冰下湖活动及水文联系——多源卫星测高数据监测结果分析[J]. 测绘学报, 2020, 49(5): 547-556.

CHEN Junlin, ZHOU Chunxia, ZHAO Qiuyang. Subglacial lake activity and hydrological connection in the Byrd glacier basin during 2003—2018: analysis of multimission satellite altimetry monitoring results[J]. Acta Geodaetica et Cartographica Sinica, 2020, 49(5): 547-556.

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