Snowfall in coastal West Antarctica much greater than previously assumed

[1] A new Antarctic accumulation distribution, based on regional model output calibrated with 1900 in-situ observations, is used to re-assess accumulation in 24 Antarctic ice drainage basins. When compared to the previous compilation, good agreement is found for 19 of the 24 basins, representing 93% of the ice sheet that is reasonably well covered with observations. In contrast, the Amundsen Sea sector of West Antarctica and the western Antarctic Peninsula, both data sparse regions, are found to receive 80–96% more accumulation than previously assumed. For the Pine Island and Thwaites Glaciers (West Antarctica), which have recently undergone rapid acceleration and thinning, this means a downward adjustment of their contribution to global sea level rise from 0.24 to 0.14 mm per year. Model time series do not show a significant change in Antarctic accumulation over the period 1980–2004.

[1]  E. van Meijgaard,et al.  Reassessment of the Antarctic surface mass balance using calibrated output of a regional atmospheric climate model , 2006 .

[2]  Edward Hanna,et al.  Snowfall-Driven Growth in East Antarctic Ice Sheet Mitigates Recent Sea-Level Rise , 2005, Science.

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

[4]  J. King,et al.  Precipitation, sublimation, and snow drift in the Antarctic Peninsula region from a regional atmospheric model , 2004 .

[5]  D. Bromwich,et al.  Strong Trends in the Skill of the ERA-40 and NCEP–NCAR Reanalyses in the High and Midlatitudes of the Southern Hemisphere, 1958–2001* , 2004 .

[6]  P. Kanagaratnam,et al.  Accelerated Sea-Level Rise from West Antarctica , 2004, Science.

[7]  W. Krabill,et al.  Improved estimation of the mass balance of glaciers draining into the Amundsen Sea sector of West Antarctica from the CECS/NASA 2002 campaign , 2004, Annals of Glaciology.

[8]  G. Marshall.  Trends in the Southern Annular Mode from Observations and Reanalyses , 2003 .

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

[10]  S. Déry,et al.  Large‐scale mass balance effects of blowing snow and surface sublimation , 2002 .

[11]  J. Turner,et al.  Spatial variability of Antarctic Peninsula net surface mass balance , 2002 .

[12]  David W. J. Thompson,et al.  Interpretation of Recent Southern Hemisphere Climate Change , 2002, Science.

[13]  Helmut Rott,et al.  Northern Larsen Ice Shelf, Antarctica: further retreat after collapse , 2002, Annals of Glaciology.

[14]  Philippe Huybrechts,et al.  The Dynamic Response of the Greenland and Antarctic Ice Sheets to Multiple-Century Climatic Warming , 1999 .

[15]  D. Vaughan,et al.  Reassessment of net surface mass balance in Antarctica , 1999 .

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

[17]  H. Zwally,et al.  Accumulation in Antarctica and Greenland derived from passive-microwave data: a comparison with contoured compilations , 1995, Annals of Glaciology.

[18]  Nigel Waters,et al.  Dependence of Antarctic surface mass balance on temperature, elevation, and distance to open ocean , 1990 .

[19]  J. Oerlemans,et al.  Parameterization of the Annual Surface Temperature and Mass Balance of Antarctica , 1990, Annals of Glaciology.