Preprints
https://doi.org/10.5194/tc-2021-278
https://doi.org/10.5194/tc-2021-278

  05 Nov 2021

05 Nov 2021

Review status: this preprint is currently under review for the journal TC.

Basal Water Storage Variations beneath Antarctic Ice Sheet Inferred from Multi-source Satellite Data

Jingyu Kang1,2, Yang Lu1, Yan Li1,2, Zizhan Zhang1, and Hongling Shi1 Jingyu Kang et al.
  • 1State Key Laboratory of Geodesy and Earth’s Dynamics, Innovation Academy for Precision Measurement Science and Technology, Wuhan 430071, China
  • 2University of Chinese Academy of Sciences, Beijing 100049, China

Abstract. Antarctic basal water storage variations (BWSV) refer to the mass variations of liquid water beneath Antarctic ice sheet. Identifying these variations is critical to understand the behaviour of ice sheet, yet it is rarely accessible to direct observation. We presented a layered gravity density forward/inversion method for estimating Antarctic BWSV from multi- source satellite observation data, and relevant models. Results reveal spatial variability of BWSV with the mean rate of 43 ± 13 Gt/yr during 2003–2009, which is 21 Gt/yr lower than basal melting rate. This indicates that the basal meltwater beneath Antarctic ice sheet is decreasing with the rate of −21 ± 13 Gt/yr, accounting for 28 % of the mass balance rate (−76 Gt/yr, Shepherd et al. (2018)), and the basal water migrations between basal drainage systems and oceans is non-ignorable in estimating basal mass balance of Antarctic ice sheet. Similar spatial distribution of basal water increases regions and locations of active subglacial lakes indicates that basal water storage in most active subglacial lakes is increasing. In most region of Antarctic ice sheet except Amundsen Sea coast region, the comparison of spatial BWSV and ice velocity displays a positive correlation between considerable basal water increases and rapid/accelerated ice flows, which indicates that BWSV appear to have an important effect on ice flows. Accordingly, we infer that further enhanced flow velocities are expected if basal water continues to increase in these regions.

Jingyu Kang et al.

Status: open (until 31 Dec 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Jingyu Kang et al.

Jingyu Kang et al.

Viewed

Total article views: 292 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
242 49 1 292 1 1
  • HTML: 242
  • PDF: 49
  • XML: 1
  • Total: 292
  • BibTeX: 1
  • EndNote: 1
Views and downloads (calculated since 05 Nov 2021)
Cumulative views and downloads (calculated since 05 Nov 2021)

Viewed (geographical distribution)

Total article views: 282 (including HTML, PDF, and XML) Thereof 282 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 26 Nov 2021
Download
Short summary
Antarctic basal water storage variations (BWSV) effect basal effective pressure and produces changing ice velocity, yet it is rarely accessible to direct observation. We estimated the BWSV by using multisource satellite data. Result revealed BWSV is increasing with the rate of 43 ± 13 Gt/yr. Basal water in most active subglacial lakes is increasing, despite water discharging occur frequently. Fierce basal water increases are often accompanied with massive rapid and accelerated ice flows.