Computing the volume response of the Antarctic Peninsula ice sheet to warming scenarios to 2200

Abstract The contribution to sea level to 2200 from the grounded, mainland Antarctic Peninsula ice sheet (APIS) was calculated using an ice-sheet model initialized with a new technique computing ice fluxes based on observed surface velocities, altimetry and surface mass balance, and computing volume response using a linearized method. Volume change estimates of the APIS resulting from surface mass-balance anomalies calculated by the regional model RACMO2, forced by A1B and E1 scenarios of the global models ECHAM5 and HadCM3, predicted net negative sea-level contributions between −0.5 and −12 mm sea-level equivalent (SLE) by 2200. Increased glacier flow due to ice thickening returned ∼15% of the increased accumulation to the sea by 2100 and ∼30% by 2200. The likely change in volume of the APIS by 2200 in response to imposed 10 and 20 km retreats of the grounding line at individual large outlet glaciers in Palmer Land, southern Antarctic Peninsula, ranged between 0.5 and 3.5 mm SLE per drainage basin. Ensemble calculations of APIS volume change resulting from imposed grounding-line retreat due to ice-shelf break-up scenarios applied to all 20 of the largest drainage basins in Palmer Land (covering ∼40% of the total area of APIS) resulted in net sea-level contributions of 7–16 mm SLE by 2100, and 10–25 mm SLE by 2200. Inclusion of basins in the northern peninsula and realistic simulation of grounding-line movement for AP outlet glaciers will improve future projections.

[1]  M. R. van den Broeke,et al.  Future surface mass balance of the Antarctic ice sheet and its influence on sea level change, simulated by a regional atmospheric climate model , 2013, Climate Dynamics.

[2]  D. Vaughan,et al.  Spatial and temporal variation of surface temperature on the Antarctic Peninsula and the limit of viability of ice shelves , 2013 .

[3]  N. Barrand,et al.  Trends in Antarctic Peninsula surface melting conditions from observations and regional climate modeling , 2012 .

[4]  Eric Rignot,et al.  A Reconciled Estimate of Ice-Sheet Mass Balance , 2012, Science.

[5]  Bo Sun,et al.  Bedmap2: improved ice bed, surface and thickness datasets for Antarctica , 2012 .

[6]  Theodore A. Scambos,et al.  Mass loss of Larsen B tributary glaciers (Antarctic Peninsula) unabated since 2002 , 2012 .

[7]  M. Oppenheimer,et al.  Investigation of land ice‐ocean interaction with a fully coupled ice‐ocean model: 2. Sensitivity to external forcings , 2012 .

[8]  M. Oppenheimer,et al.  Investigation of land ice-ocean interaction with a fully coupled ice-ocean model: 1. Model description and behavior , 2012 .

[9]  R. Hindmarsh.  An Observationally-Validated Theory of Viscous Flow Dynamics at the Ice-Shelf Calving-Front , 2012 .

[10]  R. Arthern,et al.  Frequency response of ice streams , 2012, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[11]  E. van Meijgaard,et al.  A new, high‐resolution surface mass balance map of Antarctica (1979–2010) based on regional atmospheric climate modeling , 2012 .

[12]  M. Morlighem,et al.  A mass conservation approach for mapping glacier ice thickness , 2011, Geophysical Research Letters.

[13]  B. Scheuchl,et al.  Ice Flow of the Antarctic Ice Sheet , 2011, Science.

[14]  Ted A. Scambos,et al.  2001–2009 elevation and mass losses in the Larsen A and B embayments, Antarctic Peninsula , 2011, Journal of Glaciology.

[15]  Eric Rignot,et al.  Ice flux divergence anomalies on 79north Glacier, Greenland , 2011 .

[16]  Axel Rülke,et al.  On-land ice loss and glacial isostatic adjustment at the drake passage: 2003-2009 , 2011 .

[17]  R. Hock,et al.  Regionally differentiated contribution of mountain glaciers and ice caps to future sea-level rise , 2011 .

[18]  K. Steffen,et al.  Climate of the Greenland ice sheet using a high-resolution climate model – Part 1: Evaluation , 2010 .

[19]  T. Nagler,et al.  The imbalance of glaciers after disintegration of Larsen-B ice shelf, Antarctic Peninsula , 2010 .

[20]  Eric Rignot,et al.  Spatial patterns of basal drag inferred using control methods from a full‐Stokes and simpler models for Pine Island Glacier, West Antarctica , 2010 .

[21]  D. Vaughan,et al.  Overview of areal changes of the ice shelves on the Antarctic Peninsula over the past 50 years , 2009 .

[22]  M. Dyurgerov,et al.  Mountain glaciers and ice caps around Antarctica make a large sea‐level rise contribution , 2009 .

[23]  John Chan.  Where Is the Imbalance? , 2009 .

[24]  Marc Bernard,et al.  SPIRIT. SPOT 5 stereoscopic survey of Polar Ice: Reference Images and Topographies during the fourth International Polar Year (2007-2009) , 2008 .

[25]  Jonathan L. Bamber,et al.  A new 1 km Digital Elevation Model of the Antarctic Derived From Combined Satellite Radar and Laser Data , 2008 .

[26]  Eric Rignot,et al.  Recent Antarctic ice mass loss from radar interferometry and regional climate modelling , 2008 .

[27]  G. Marshall,et al.  A doubling in snow accumulation in the western Antarctic Peninsula since 1850 , 2008 .

[28]  E. van Meijgaard,et al.  The KNMI regional atmospheric climate model RACMO version 2.1 , 2008 .

[29]  David G. Vaughan,et al.  Widespread Acceleration of Tidewater Glaciers on the Antarctic Peninsula , 2007 .

[30]  C. Schoof.  Ice sheet grounding line dynamics: Steady states, stability, and hysteresis , 2007 .

[31]  R. Hindmarsh.  The role of membrane-like stresses in determining the stability and sensitivity of the Antarctic ice sheets: back pressure and grounding line motion , 2006, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[32]  R. Hindmarsh,et al.  Draping or overriding: The effect of horizontal stress gradients on internal layer architecture in ice sheets , 2006 .

[33]  David G. Vaughan,et al.  Recent Trends in Melting Conditions on the Antarctic Peninsula and Their Implications for Ice-sheet Mass Balance and Sea Level , 2006 .

[34]  A. Sterl,et al.  The ERA‐40 re‐analysis , 2005 .

[35]  M. Broeke,et al.  Strong surface melting preceded collapse of Antarctic Peninsula ice shelf , 2005 .

[36]  J. G. Ferrigno,et al.  Retreating Glacier Fronts on the Antarctic Peninsula over the Past Half-Century , 2005, Science.

[37]  J. Turner,et al.  Antarctic climate change during the last 50 years , 2005 .

[38]  Ian Joughin,et al.  Basal shear stress of the Ross ice streams from control method inversions , 2004 .

[39]  Eric Rignot,et al.  Accelerated ice discharge from the Antarctic Peninsula following the collapse of Larsen B ice shelf , 2004 .

[40]  R. Arthern,et al.  Optimal estimation of changes in the mass of ice sheets , 2003 .

[41]  John Turner,et al.  Recent Rapid Regional Climate Warming on the Antarctic Peninsula , 2003 .

[42]  Pedro Skvarca,et al.  Glacier Surge After Ice Shelf Collapse , 2003, Science.

[43]  R. Bindschadler,et al.  Antarctic Peninsula climate variability : historical and paleoenvironmental perspectives , 2003 .

[44]  A. Vieli,et al.  Application of control methods for modelling the flow of Pine Island Glacier, West Antarctica , 2003, Annals of Glaciology.

[45]  Nicholas J. Higham,et al.  A Block Algorithm for Matrix 1-Norm Estimation, with an Application to 1-Norm Pseudospectra , 2000, SIAM J. Matrix Anal. Appl..

[46]  T. Scambos,et al.  The link between climate warming and break-up of ice shelves in the Antarctic Peninsula , 2000, Journal of Glaciology.

[47]  R. Hindmarsh.  Use of ice-sheet normal modes for initialization and modelling small changes , 1997, Annals of Glaciology.

[48]  D. Vaughan,et al.  Recent atmospheric warming and retreat of ice shelves on the Antarctic Peninsula , 1996, Nature.

[49]  Andrew C. Fowler,et al.  Modelling ice sheet dynamics , 1992 .

[50]  D. Macayeal.  The basal stress distribution of Ice Stream E, Antarctica, inferred by control methods , 1992 .

[51]  S. Shyam Sunder,et al.  Creep of Polycrystalline Ice , 1990 .

[52]  L. Morland.  Thermomechanical balances of ice sheet flows , 1984 .

[53]  K. Hutter.  Theoretical Glaciology: Material Science of Ice and the Mechanics of Glaciers and Ice Sheets , 1983 .

[54]  J. Weertman.  On the Sliding of Glaciers , 1957, Journal of Glaciology.

[55]  J. W. Glen,et al.  The creep of polycrystalline ice , 1955, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.