Acta Geodaetica et Cartographica Sinica ›› 2020, Vol. 49 ›› Issue (5): 547-556.doi: 10.11947/j.AGCS.2020.20190209

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Subglacial lake activity and hydrological connection in the Byrd glacier basin during 2003—2018: analysis of multimission satellite altimetry monitoring results

CHEN Junlin1, ZHOU Chunxia1, ZHAO Qiuyang1,2   

  1. 1. Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan 430079, China;
    2. Optics Valley BeiDou International School, Hubei Polytechnic University, Huangshi 435003, China
  • Received:2019-06-03 Revised:2019-12-05 Published:2020-05-23
  • Supported by:
    The National Natural Science Foundation of China (Nos. 41531069;41776200;41376187)

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 Byrds9 subglacial lake and Byrds14 subglacial lake kept rising because of supplementary by upstream Byrds11 and Byrds15 drainage respectively.

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

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