Journal metrics

Journal metrics

  • IF value: 4.524 IF 4.524
  • IF 5-year value: 5.558 IF 5-year 5.558
  • CiteScore value: 4.84 CiteScore 4.84
  • SNIP value: 1.425 SNIP 1.425
  • SJR value: 3.034 SJR 3.034
  • IPP value: 4.65 IPP 4.65
  • h5-index value: 52 h5-index 52
  • Scimago H index value: 55 Scimago H index 55
The Cryosphere, 12, 1523-1530, 2018
https://doi.org/10.5194/tc-12-1523-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Brief communication
27 Apr 2018
Brief communication: Unabated wastage of the Juneau and Stikine icefields (southeast Alaska) in the early 21st century
Etienne Berthier1, Christopher Larsen2, William J. Durkin3, Michael J. Willis4, and Matthew E. Pritchard3 1LEGOS, Université de Toulouse, CNES, CNRS, IRD, UPS, 31400 Toulouse, France
2Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, USA
3Earth and Atmospheric Sciences Department, Cornell University, Ithaca, NY, USA
4Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO, USA
Abstract. The large Juneau and Stikine icefields (Alaska) lost mass rapidly in the second part of the 20th century. Laser altimetry, gravimetry and field measurements suggest continuing mass loss in the early 21st century. However, two recent studies based on time series of Shuttle Radar Topographic Mission (SRTM) and Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) digital elevation models (DEMs) indicate a slowdown in mass loss after 2000. Here, the ASTER-based geodetic mass balances are recalculated carefully avoiding the use of the SRTM DEM because of the unknown penetration depth of the C-band radar signal. We find strongly negative mass balances from 2000 to 2016 (−0.68 ± 0.15 m w.e. a−1 for the Juneau Icefield and −0.83 ± 0.12 m w.e. a−1 for the Stikine Icefield), in agreement with laser altimetry, confirming that mass losses are continuing at unabated rates for both icefields. The SRTM DEM should be avoided or used very cautiously to estimate glacier volume change, especially in the North Hemisphere and over timescales of less than  ∼  20 years.
Citation: Berthier, E., Larsen, C., Durkin, W. J., Willis, M. J., and Pritchard, M. E.: Brief communication: Unabated wastage of the Juneau and Stikine icefields (southeast Alaska) in the early 21st century, The Cryosphere, 12, 1523-1530, https://doi.org/10.5194/tc-12-1523-2018, 2018.
Publications Copernicus
Download
Short summary
Two recent studies suggested a slowdown in mass loss after 2000 of the Juneau and Stikine icefields, accounting for 10% of the total ice cover in Alaska. Here, the ASTER-based geodetic mass balances are revisited, carefully avoiding the use of the SRTM DEM, because of the unknown penetration depth of the SRTM C-band radar signal. We find strongly negative mass balances from 2000 to 2016 for both icefields, in agreement with airborne laser altimetry. Mass losses are thus continuing unabated.
Two recent studies suggested a slowdown in mass loss after 2000 of the Juneau and Stikine...
Share