Evidence from ice shelves for channelized meltwater flow beneath the Antarctic Ice Sheet

Subglacial meltwater channels beneath the Antarctic Ice Sheet have been reported, but the nature and distribution of these meltwater pathways are unclear. Remote sensing observations reveal persistent channelized features beneath the Filchner–Ronne Ice Shelf in West Antarctica, suggesting widespread channelized flow driven by melting.

[1]  Leigh A. Stearns,et al.  Increased flow speed on a large East Antarctic outlet glacier caused by subglacial floods , 2008 .

[2]  A. Jenkins,et al.  Influence of tides on melting and freezing beneath Filchner‐Ronne Ice Shelf, Antarctica , 2011, Geophysical Research Letters.

[3]  D. Blankenship,et al.  Steep reverse bed slope at the grounding line of the Weddell Sea sector in West Antarctica , 2012 .

[4]  K. D. Mankoff,et al.  The role of Pine Island Glacier ice shelf basal channels in deep-water upwelling, polynyas and ocean circulation in Pine Island Bay, Antarctica , 2012, Annals of Glaciology.

[5]  Stephen F. Price,et al.  Ice-shelf basal channels in a coupled ice/ocean model , 2012, Journal of Glaciology.

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

[7]  Frank Pattyn,et al.  Antarctic subglacial conditions inferred from a hybrid ice sheet/ice stream model , 2010 .

[8]  M. Siegert,et al.  High sensitivity of subglacial hydrological pathways in Antarctica to small ice‐sheet changes , 2008 .

[9]  C. Schoof.  Ice-sheet acceleration driven by melt supply variability , 2010, Nature.

[10]  H. Fricker,et al.  The supply of subglacial meltwater to the grounding line of the Siple Coast, West Antarctica , 2012, Annals of Glaciology.

[11]  Kelly M. Brunt,et al.  Mapping the grounding zone of the Amery Ice Shelf, East Antarctica using InSAR, MODIS and ICESat , 2009, Antarctic Science.

[12]  D. Vaughan,et al.  Marine ice in Larsen Ice Shelf , 2009 .

[13]  P. Clark,et al.  Subglacial drainage, eskers, and deforming beds beneath the Laurentide and Eurasian ice sheets , 1994 .

[14]  T. Painter,et al.  MODIS-based Mosaic of Antarctica (MOA) data sets: Continent-wide surface morphology and snow grain size , 2007 .

[15]  R. L. Shreve.  Movement of water in glaciers , 1972 .

[16]  A. Jenkins,et al.  Ice-Ocean Interaction On Ronne Ice Shelf, Antarctica , 1991, Annals of Glaciology.

[17]  Jonathan L. Bamber,et al.  Ice shelf thickness over Larsen C, Antarctica, derived from satellite altimetry , 2009 .

[18]  Duncan J. Wingham,et al.  Rapid discharge connects Antarctic subglacial lakes , 2006, Nature.

[19]  WATER PRESSURE IN INTRA-AND SUBGLACIAL CHANNELS* , 1972 .

[20]  Roger LeB. Hooke,et al.  Principles of Glacier Mechanics , 1997 .

[21]  S. Tulaczyk,et al.  Basal mechanics of Ice Stream B, west Antarctica: 2. Undrained plastic bed model , 2000 .

[22]  B. Smith,et al.  An inventory of active subglacial lakes in Antarctica detected by ICESat (2003–2008) , 2009, Journal of Glaciology.

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

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

[25]  Eric Rignot,et al.  Channelized bottom melting and stability of floating ice shelves , 2008 .

[26]  Robert Raiswell,et al.  Contributions from glacially derived sediment to the global iron (oxyhydr)oxide cycle : Implications for iron delivery to the oceans , 2006 .

[27]  Duncan J. Wingham,et al.  Subglacial melt channels and fracture in the floating part of Pine Island Glacier, Antarctica , 2012 .

[28]  Hermann Engelhardt,et al.  Basal mechanics of Ice Stream B, west Antarctica: 1. Till mechanics , 2000 .

[29]  Sridhar Anandakrishnan,et al.  Stagnation of Ice Stream C, West Antarctica by water piracy , 1997 .

[30]  Eric Rignot,et al.  Roles of marine ice, rheology, and fracture in the flow and stability of the Brunt/Stancomb-Wills Ice Shelf , 2009 .

[31]  R. Alley,et al.  A subglacial water-flow model for West Antarctica , 2009, Journal of Glaciology.

[32]  Alun Hubbard,et al.  Seasonal evolution of subglacial drainage and acceleration in a Greenland outlet glacier , 2010 .

[33]  N. Glasser,et al.  Longitudinal surface structures (flowstripes) on Antarctic glaciers , 2011 .

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

[35]  I. Joughin,et al.  Melting and freezing beneath Filchner‐Ronne Ice Shelf, Antarctica , 2003 .

[36]  A. Jenkins.  Convection-Driven Melting near the Grounding Lines of Ice Shelves and Tidewater Glaciers , 2011 .

[37]  D. Sugden,et al.  Subglacial meltwater channel systems and ice sheet overriding, Asgard Range, Antarctica , 1991 .