Resolving seasonal ice velocity of 45 Greenlandic glaciers with very high temporal details

TY - JOUR

T1 - Resolving seasonal ice velocity of 45 Greenlandic glaciers with very high temporal details

AU - Vijay, Saurabh

AU - Khan, Shfaqat Abbas

AU - Kusk, Anders

AU - Solgaard, Anne M.

AU - Moon, T.

AU - Bjørk, Anders Anker

PY - 2019/2/16

Y1 - 2019/2/16

N2 - Seasonal glacier ice velocities are important for understanding controlling mechanisms of ice flow. For many Greenlandic glaciers, however, these measurements are limited by low temporal resolution. We present seasonal ice velocity changes, melt season onset and extent, and ice front positions for 45 Greenlandic glaciers using 2015–2017 Sentinel-1 synthetic aperture radar data. Seasonal velocity fluctuations of roughly half of the glaciers appear to be primarily controlled by surface melt-induced changes in the subglacial hydrology. This includes (1) glaciers that speed up with the onset of surface melt and (2) glaciers with comparable late winter and early melt season velocities that show significant slowdown during most of the melt season and speedup during winter. In contrast, less than a quarter of the study glaciers show strong correspondence between seasonal ice speed and terminus changes. Our results pinpoint seasonal variations across Greenland, highlighting the variable influence of meltwater on year-round ice velocities.

AB - Seasonal glacier ice velocities are important for understanding controlling mechanisms of ice flow. For many Greenlandic glaciers, however, these measurements are limited by low temporal resolution. We present seasonal ice velocity changes, melt season onset and extent, and ice front positions for 45 Greenlandic glaciers using 2015–2017 Sentinel-1 synthetic aperture radar data. Seasonal velocity fluctuations of roughly half of the glaciers appear to be primarily controlled by surface melt-induced changes in the subglacial hydrology. This includes (1) glaciers that speed up with the onset of surface melt and (2) glaciers with comparable late winter and early melt season velocities that show significant slowdown during most of the melt season and speedup during winter. In contrast, less than a quarter of the study glaciers show strong correspondence between seasonal ice speed and terminus changes. Our results pinpoint seasonal variations across Greenland, highlighting the variable influence of meltwater on year-round ice velocities.

U2 - 10.1029/2018GL081503

DO - 10.1029/2018GL081503

M3 - Journal article

SN - 0094-8276

VL - 46

SP - 1485

EP - 1495

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 3

ER -