Glaciers Response after Disintegration of Northern Larsen Ice Shelf, Antarctic Peninsula, observed by Multisensor Satellite Data
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1 Glaciers Response after Disintegration of Northern Larsen Ice Shelf, Antarctic Peninsula, observed by Multisensor Satellite Data Helmut Rott1,2, Jan Wuite1, Thomas Nagler1, Dana Floricioiu3, Michael Kern4 1 ENVEO IT GmbH, Innsbruck, Austria 2 Institute for Meteorology & Geophysics, Univ. Innsbruck 3 DLR-IMF, Oberpfaffenhofen; Germany 4 ESA ESTEC, Noordwijk, NL H. Rott ESA-CliC EGU Workshop_ Nov2012 Mass Deficit Glaciers Antarctic Peninsula
2 Contents of Presentation The GlacAPI Project Method for estimating Calving Flux and Mass Balance Larsen-A and PGC Glacier Basins Retreat of Grounded Ice Acceleration Drygalski Glacier Velocities of D-B-E and S-B Glaciers Estimates of Calving Fluxes and Ice Export
3 GlacAPI Project Objectives Improved numbers on mass balance and sea level contribution of glaciers Supply data to analyse dynamic processes causing the acceleration of outlet glaciers after ice shelf disintegration. Detection of possible pre-cursors of ice shelf disintegration Area and period of interest: API region from Prince Gustav Channel to Jason Peninsula, starting Data base: complete time series of archived satellite data (ERS, ASAR, ICESat Terra-SAR-X, TanDEM-X, Landsat, ) and new data (CryoSat, Terra-SAR-X, TanDEM-X), supported by available airborne and in situ data. Technical developments focus at methods for synergistic use of the different satellite sensors for retrieving ice surface topography and motion. GlacAPI Multi-Sensor Analysis of Glacier Response to Climate Change on the Antarctic Peninsula ESA Contract /12/NL/CBi Science Partners:
4 Method for Retrieval of Net Mass Balance The net mass balance B N of calving glaciers is computed as difference between net accumulation, B A, on grounded ice minus the export through a cross section at the grounding line or calving front, B C : B N = B A B C Procedures applied: B ) c u( y) H( y Y dy Map calving velocity with SAR data (InSAR, cross-correlation) Estimate cross section of calving gate for floating fronts through frontal height measured by using altimeter data and TanDEM-X Estimate cross section of calving gate (non-floating) through balance flux 1995 (ERS Tandem ice motion) Estimate Surface Net Balance (Net accumulation B A ) from published data. Plateau: 2000 mm (Turner, 2002); sea level: 0 mm (Rott et al., 1998)
![Drainage Basins of Larsen A and Prince Gustav Channel Glacier Area [km 2 ] 1. Cape Longing 874 2. Sjøgren-Boydell 571 3. Pyke Glacier 512 4.D-B-E 653 5.](/docs-images/89/99817124/images/5-0.jpg "Sobral PeninsuIa 266 6. Cape Worsely 641 7. Drygalski 1015 Total Area 2002 4 532 Without (1.) and (5.) 3 392 Landsat Image 2002; Glacier boundaries after A.")
5 Drainage Basins of Larsen A and Prince Gustav Channel Glacier Area [km 2 ] 1. Cape Longing Sjøgren-Boydell Pyke Glacier D-B-E Sobral PeninsuIa Cape Worsely Drygalski 1015 Total Area Without (1.) and (5.) Landsat Image 2002; Glacier boundaries after A. Cook et al., 2012
6 Retreat of Grounded Ice Section 1995/ /2008 PCG km 2 Larsen-A km 2 Larsen-B km 2 08/ Retreat slowed down in recent years
7 Photo: W. Rack Drygalski Glacier
8 Drygalski Glacier Acceleration ERS Tandem InSAR 31Oct/1Nov /10 Nov 1999 A TerraSAR-X H. Rott ESA-CliC EGU Workshop_ Nov2012 Mass Deficit Glaciers Antarctic Peninsula
9 Drygalski Glacier Ice Velocity TerraSAR-X Velocity at Gate A-B (Oct 2007 to Nov 2009) A A Mean Ice Velocity (Oct 2007 to Nov 2009) B B
10 Drygalski Glacier Ice Velocity TerraSAR-X At Gate Centre Analysis W. Abdel Jaber DLR-IMF Oct 2010 Temporal variations near glacier front: Seasonal Signal: Acceleration in late summer Overall trend of slow-down.
11 TanDEM-X Topography Drygalski Glacier m 1772 m
12 Drygalski Glacier Surface Elevation at Calving Gate TanDEM-X m 2 km
13 Velocity Dinsmoore-Bombardier- Edgeworth Glaciers TerraSAR -X 2.5 m/d 2007 Velocity profile gate B-E ERS InSAR Analysis Acceleration: 9/10 Nov Oct/1Nov 1995
14 TanDEM-X Topography Sjögren- Boydell Glacier m 1914 m
15 Sjögren-Boydell Glacier Ice Velocity
16 Net Mass Balance Larsen-A & PGC Glaciers (Preliminary Results) Glacier Gate Area V c (m/yr) Discharge (Gt/yr) km Mass Deficit/yr Drygalski DR * Dinsmoor Edgeworth Bombadier D EB Sjögren SJ SJ Boydell BO Total Gt kg m2 PG+CW+SJ Gt kg m2 Sum LA+PGC 7.30 Gt/yr These numbers will be consolidated by analysing the full TSX and TDX data set
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