Preprints
https://doi.org/10.5194/esurf-2021-21
https://doi.org/10.5194/esurf-2021-21

  19 Mar 2021

19 Mar 2021

Review status: this preprint has been withdrawn by the authors.

Spatio-temporal variations in glacier surface velocity in the Himalayas

Yu Zhou1,2, Jianlong Chen1,2, and Xiao Cheng2,3 Yu Zhou et al.
  • 1Guangdong Provincial Key Laboratory of Geodynamics and Geohazards, School of Earth Sciences and Engineering, Sun Yat-Sen University, Guangzhou 510275, China
  • 2Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China
  • 3School of Geospatial Engineering and Science, Sun Yat-Sen University, Guangzhou 510275, China

Abstract. Glacier evolution with time provides important information about climate variability. Here we investigate glacier surface velocity in the Himalayas and analyse the patterns of glacier flow. We collect 220 scenes of Landsat-7 panchromatic images between 1999 and 2000, and Sentinel-2 panchromatic images between 2017 and 2018, to calculate surface velocities of 36,722 glaciers during these two periods. We then derive velocity changes between 1999 and 2018, based on which we perform a detailed analysis of motion of each individual glacier, and noted that the changes are spatially heterogeneous. Of all the glaciers, 32 % have speeded up, 24.5 % have slowed down, and the rest 43.5 % remained stable. The amplitude of glacier slowdown, as a result of glacier mass loss, is remarkably larger than that of speedup. At regional scales, we found that glacier surface velocity in winter has uniformly decreased in the western part of the Himalayas between 1999 and 2018, whilst increased in the eastern part; this contrasting difference may be associated with decadal changes in accumulation and/or melting under different climatic regimes. We also found that the overall trend of surface velocity exhibits seasonal variability: summer velocity changes are positively correlated with mass loss, whereas winter velocity changes show a negative correlation. Our study suggests that glacier velocity changes in the Himalayas are more spatially and temporally heterogeneous than previously thought, emphasising complex interactions between glacier dynamics and environmental forcing.

This preprint has been withdrawn.

Yu Zhou et al.

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on esurf-2021-21', Anonymous Referee #1, 04 May 2021
  • RC2: 'Comment on esurf-2021-21', Tobias Bolch, 11 Jun 2021

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on esurf-2021-21', Anonymous Referee #1, 04 May 2021
  • RC2: 'Comment on esurf-2021-21', Tobias Bolch, 11 Jun 2021

Yu Zhou et al.

Yu Zhou et al.

Viewed

Total article views: 649 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
536 103 10 649 2 2
  • HTML: 536
  • PDF: 103
  • XML: 10
  • Total: 649
  • BibTeX: 2
  • EndNote: 2
Views and downloads (calculated since 19 Mar 2021)
Cumulative views and downloads (calculated since 19 Mar 2021)

Viewed (geographical distribution)

Total article views: 534 (including HTML, PDF, and XML) Thereof 534 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 23 Sep 2021
Download

This preprint has been withdrawn.