Apr 22, 2017

How much, how fast?: A science review and outlook for research on the instability of Antarctica's Thwaites Glacier in the 21st century

T.A. Scambos, R.E. Bell, R.B. Alley, S. Anandakrishnan, D.H. Bromwich, K. Brunt, K. Christianson, T. Creyts, S.B. Das, R. DeConto, P. Dutrieux, H.A. Fricker, D. Holland, J. MacGregor, B. Medley, J.P. Nicolas, D. Pollard, M.R. Siegfried et al
Global and Planetary Change
  • States that constraining how much and how fast the West Antarctic Ice Sheet (WAIS) will change in the coming decades has recently been identified as the highest priority in Antarctic research
  • Reviews recent research on WAIS and outline further scientific objectives for the area now identified as the most likely to undergo near-term significant change: Thwaites Glacier and the adjacent Amundsen Sea
  • Models indicate a potential for greatly accelerated ice loss as ocean-driven melting at the Thwaites Glacier grounding zone and nearby areas leads to thinning, faster flow, and retreat
  • Research indicates a complete retreat of the Thwaites Glacier basin would raise global sea level by >3 meters
  • Concludes this scenario could occur over the next few centuries, and faster ice loss could occur through processes omitted from most ice flow models such as hydrofracture
  • Concludes that increased basal melt at the grounding zone and increased potential for hydrofracture due to enhanced surface melt could initiate a more rapid collapse within the next few decades