Evolving Instability of the Scar Inlet Ice Shelf based on Sequential Landsat Images Spanning 2005-2018

Following the large-scale disintegration of the Larsen B Ice Shelf (LBIS) in 2002, ice flow velocities for its remnants and tributary glaciers began to increase. In this study, we used sequential Landsat images spanning 2005–2018 to produce detailed maps of the ice flow velocities and surface features for the Scar Inlet Ice Shelf (SIIS). Our results indicate that the ice flow velocities for the SIIS and its tributary glaciers (Flask and Leppard Glaciers) have substantially increased since 2005. Surface features, such as rifts and crevasses, have also substantially increased in both scope and scale and are particularly evident in the region between the Leppard Glacier and the Jason Peninsula. Several indicators—including the acceleration of ice flows, the rapid growth of major surface rifts, the heavily enhanced surface crevasses, and the dynamic position of the ice front—point to the evolving instability of the SIIS. These same indicators describe the conditions for the LBIS leading up to its 2002 collapse. To date, however, the SIIS remains intact. The formation of fast ice supporting the ice shelf front, combined with moderate mean summer temperatures, may be preventing or delaying its collapse.

[1]  Jun Chen,et al.  Surface velocity estimations of ice shelves in the northern Antarctic Peninsula derived from MODIS data , 2016, Journal of Geographical Sciences.

[2]  Eric Rignot,et al.  Antarctic grounding line mapping from differential satellite radar interferometry , 2011 .

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

[4]  Ian Joughin,et al.  Changes in ice front position on Greenland's outlet glaciers from 1992 to 2007 , 2008 .

[5]  Hyangsun Han,et al.  Changes in a Giant Iceberg Created from the Collapse of the Larsen C Ice Shelf, Antarctic Peninsula, Derived from Sentinel-1 and CryoSat-2 Data , 2019, Remote. Sens..

[6]  Christine Wesche,et al.  Calving Fronts of Antarctica: Mapping and Classification , 2013, Remote. Sens..

[7]  John Turner,et al.  Absence of 21st century warming on Antarctic Peninsula consistent with natural variability , 2016, Nature.

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

[9]  Claudia Kuenzer,et al.  Remote Sensing of Antarctic Glacier and Ice-Shelf Front Dynamics - A Review , 2018, Remote. Sens..

[10]  Harihar Rajaram,et al.  Glacier crevasses: Observations, models, and mass balance implications , 2016 .

[11]  F Navarro,et al.  Recent regional climate cooling on the Antarctic Peninsula and associated impacts on the cryosphere. , 2017, The Science of the total environment.

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

[13]  Eric Rignot,et al.  The evolving instability of the remnant Larsen B Ice Shelf and its tributary glaciers , 2014 .

[14]  Peter Sammonds,et al.  Fracture of Antarctic shelf ice , 2002 .

[15]  W. Rack,et al.  Pattern of retreat and disintegration of the Larsen B ice shelf, Antarctic Peninsula , 2004, Annals of Glaciology.

[16]  N. Glasser,et al.  A structural glaciological analysis of the 2002 Larsen B ice-shelf collapse , 2007, Journal of Glaciology.

[17]  T. Scambos,et al.  Glacier acceleration and thinning after ice shelf collapse in the Larsen B embayment, Antarctica , 2004 .

[18]  T. Scambos,et al.  Rapid large-area mapping of ice flow using Landsat 8 , 2016 .

[19]  R. Bindschadler,et al.  Application of image cross-correlation to the measurement of glacier velocity using satellite image data , 1992 .

[20]  Bernd Scheuchl,et al.  Mapping of Ice Motion in Antarctica Using Synthetic-Aperture Radar Data , 2012, Remote. Sens..

[21]  Helmut Rott,et al.  Evolution of surface velocities and ice discharge of Larsen B outlet glaciers from 1995 to 2013 , 2014 .

[22]  A. Vieli,et al.  Causes of pre-collapse changes of the Larsen B ice shelf: Numerical modelling and assimilation of satellite observations , 2007 .

[23]  Jun Chen,et al.  Variations in the extent and elevation of the Larsen A and B ice shelves, Antarctica, derived from multiple datasets , 2018, Journal of Applied Remote Sensing.

[24]  Helmut Rott,et al.  Changing pattern of ice flow and mass balance for glaciers discharging into the Larsen A and B embayments, Antarctic Peninsula, 2011 to 2016 , 2017 .

[25]  Edward C. King,et al.  The bedrock topography of Starbuck Glacier, Antarctic Peninsula, as determined by radio-echo soundings and flow modeling , 2014, Annals of Glaciology.

[26]  Eric Rignot,et al.  A constitutive framework for predicting weakening and reduced buttressing of ice shelves based on observations of the progressive deterioration of the remnant Larsen B Ice Shelf , 2016 .

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

[28]  S. McCallum,et al.  Stability of the Larsen B ice shelf on the Antarctic Peninsula during the Holocene epoch , 2005, Nature.

[29]  H. Fricker,et al.  Thirty years of elevation change on Antarctic Peninsula ice shelves from multimission satellite radar altimetry , 2012 .

[30]  David G. Long,et al.  Calving and ice-shelf break-up processes investigated by proxy: Antarctic tabular iceberg evolution during northward drift , 2008 .

[31]  Shi-chang Kang,et al.  Monitoring glacier variations on Geladandong mountain, central Tibetan Plateau, from 1969 to 2002 using remote-sensing and GIS technologies , 2006 .

[32]  Luke G. Bennetts,et al.  Antarctic ice shelf disintegration triggered by sea ice loss and ocean swell , 2018, Nature.

[33]  Theodore A. Scambos,et al.  Ice loss processes in the Seal Nunataks ice shelf region from satellite altimetry and imagery , 2016, Annals of Glaciology.

[34]  Yan Liu,et al.  Antarctic Surface Ice Velocity Retrieval from MODIS-Based Mosaic of Antarctica (MOA) , 2018, Remote. Sens..

[35]  Ming Yan,et al.  Discovery of the Fastest Ice Flow along the Central Flow Line of Austre Lovénbreen, a Poly-thermal Valley Glacier in Svalbard , 2019, Remote. Sens..

[36]  D. Farinotti,et al.  The ice thickness distribution of Flask Glacier, Antarctic Peninsula, determined by combining radio-echo soundings, surface velocity data and flow modelling , 2013, Annals of Glaciology.

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

[38]  Pedro Skvarca,et al.  Regional climate of the Larsen B embayment 1980–2014 , 2017, Journal of Glaciology.

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

[40]  Jason L. Roberts,et al.  Pine Island Glacier (Antarctica) velocities from Landsat7 images between 2001 and 2011: FFT-based image correlation for images with data gaps , 2013, Journal of Glaciology.

[41]  Pedro Skvarca,et al.  Climatic conditions, mass balance and dynamics of Larsen B ice shelf, Antarctic Peninsula, prior to collapse , 2004, Annals of Glaciology.

[42]  R. Bindschadler,et al.  Consideration of the errors inherent in mapping historical glacier positions in Austria from the ground and space (1893-2001) , 2003 .

[43]  Duncan J. Wingham,et al.  Recent loss of floating ice and the consequent sea level contribution , 2010 .

[44]  Eric Rignot,et al.  Sustained increase in ice discharge from the Amundsen Sea Embayment, West Antarctica, from 1973 to 2013 , 2014, Geophysical Research Letters.

[45]  H. Rott,et al.  Modeling the instantaneous response of glaciers after the collapse of the Larsen B Ice Shelf , 2015 .

[46]  N. Glasser,et al.  Surface structure and stability of the Larsen C ice shelf, Antarctic Peninsula , 2009 .

[47]  Eric Rignot,et al.  Processes involved in the propagation of rifts near Hemmen Ice Rise, Ronne Ice Shelf, Antarctica , 2004, Journal of Glaciology.

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

[49]  Allen Pope,et al.  Fracture propagation and stability of ice shelves governed by ice shelf heterogeneity , 2017 .

[50]  Guoqing Zhou,et al.  Revealing the early ice flow patterns with historical Declassified Intelligence Satellite Photographs back to 1960s , 2016 .

[51]  Kelly M. Brunt,et al.  Getting around Antarctica: new high-resolution mappings of the grounded and freely-floating boundaries of the Antarctic ice sheet created for the International Polar Year , 2011 .

[52]  P. Skvarca,et al.  Monitoring ice shelf velocities from repeat MODIS and Landsat data - a method study on the Larsen C ice shelf, Antarctic Peninsula, and 10 other ice shelves around Antarctica , 2010 .