Publication Abstracts

Hansen et al. 2021

Hansen, K., M. Truffer, A. Aschwanden, K. Mankoff, M. Bevis, A. Humbert, M.R. van den Broeke, B. Noël, A. Bjørk, W. Colgan, K.H. Kjær, S. Adhikari, V. Barletta, and S.A. Khan, 2021: Estimating ice discharge at Greenland's three largest outlet glaciers using local bedrock uplift. Geophys. Res. Lett., 48, no. 14, e2021GL094252, doi:10.1029/2021GL094252.

We present a novel method to estimate dynamic ice loss of Greenland's three largest outlet glaciers: Jakobshavn Isbræ, Kangerlussuaq Glacier, and Helheim Glacier. We use Global Navigation Satellite System (GNSS) stations attached to bedrock to measure elastic displacements of the solid Earth caused by dynamic thinning near the glacier terminus. When we compare our results with discharge, we find a time lag between glacier speedup/slowdown and onset of dynamic thinning/thickening. Our results show that dynamic thinning/thickening on Jakobshavn Isbræ occurs 0.87±0.07 years before speedup/slowdown. This implies that using GNSS time series we are able to predict speedup/slowdown of Jakobshavn Isbræ by up to 10.4 months. For Kangerlussuaq Glacier the lag between thinning/thickening and speedup/slowdown is 0.37±0.17 years (4.4 months). Our methodology and results could be important for studies that attempt to model and understand mechanisms controlling short-term dynamic fluctuations of outlet glaciers in Greenland.

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BibTeX Citation

@article{ha03120f,
  author={Hansen, K. and Truffer, M. and Aschwanden, A. and Mankoff, K. and Bevis, M. and Humbert, A. and van den Broeke, M. R. and Noël, B. and Bjørk, A. and Colgan, W. and Kjær, K. H. and Adhikari, S. and Barletta, V. and Khan, S. A.},
  title={Estimating ice discharge at Greenland's three largest outlet glaciers using local bedrock uplift},
  year={2021},
  journal={Geophysical Research Letters},
  volume={48},
  number={14},
  pages={e2021GL094252},
  doi={10.1029/2021GL094252},
}

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RIS Citation

TY  - JOUR
ID  - ha03120f
AU  - Hansen, K.
AU  - Truffer, M.
AU  - Aschwanden, A.
AU  - Mankoff, K.
AU  - Bevis, M.
AU  - Humbert, A.
AU  - van den Broeke, M. R.
AU  - Noël, B.
AU  - Bjørk, A.
AU  - Colgan, W.
AU  - Kjær, K. H.
AU  - Adhikari, S.
AU  - Barletta, V.
AU  - Khan, S. A.
PY  - 2021
TI  - Estimating ice discharge at Greenland's three largest outlet glaciers using local bedrock uplift
JA  - Geophys. Res. Lett.
JO  - Geophysical Research Letters
VL  - 48
IS  - 14
SP  - e2021GL094252
DO  - 10.1029/2021GL094252
ER  -

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