Increased ice flow in Western Palmer Land linked to ocean melting - Archive ouverte HAL Access content directly
Journal Articles Geophysical Research Letters Year : 2017

Increased ice flow in Western Palmer Land linked to ocean melting

, , , , (1) , , , , , , ,
1
Anna E. Hogg
  • Function : Author
Andrew Shepherd
  • Function : Author
Stephen L. Cornford
  • Function : Author
Kate H. Briggs
  • Function : Author
Jennifer A. Graham
  • Function : Author
Ian Joughin
  • Function : Author
Jeremie Mouginot
  • Function : Author
Thomas Nagler
  • Function : Author
Antony J. Payne
  • Function : Author
Eric Rignot
  • Function : Author
Jan Wuite
  • Function : Author

Abstract

A decrease in the mass and volume of Western Palmer Land has raised the prospect that ice speed has increased in this marine-based sector of Antarctica. To assess this possibility, we measure ice velocity over 25 years using satellite imagery and an optimized modeling approach. More than 30 unnamed outlet glaciers drain the 800 km coastline of Western Palmer Land at speeds ranging from 0.5 to 2.5 m/d, interspersed with near-stagnant ice. Between 1992 and 2015, most of the outlet glaciers sped up by 0.2 to 0.3 m/d, leading to a 13% increase in ice flow and a 15 km3/yr increase in ice discharge across the sector as a whole. Speedup is greatest where glaciers are grounded more than 300 m below sea level, consistent with a loss of buttressing caused by ice shelf thinning in a region of shoaling warm circumpolar water.
Fichier principal
Vignette du fichier
Geophysical Research Letters - 2017 - Hogg - Increased ice flow in Western Palmer Land linked to ocean melting.pdf (792.75 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03707657 , version 1 (29-06-2022)

Licence

Copyright

Identifiers

Cite

Anna E. Hogg, Andrew Shepherd, Stephen L. Cornford, Kate H. Briggs, Noel Gourmelen, et al.. Increased ice flow in Western Palmer Land linked to ocean melting. Geophysical Research Letters, 2017, 44, pp.4159-4167. ⟨10.1002/2016GL072110⟩. ⟨insu-03707657⟩
19 View
3 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More