instaar univ. of colorado
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Collaborative Research: IPY: Dynamic Controls on Tidewater Glacier Retreat
PIs:W.T. Pfeffer, CU INSTAAR/CEAEShad O’Neel, INSTAAR and Scripps/IGPPIan Howat, OSU Byrd PolarHoward Conway, University of Washington EES
Collaborators:Jacek Jania, University of SilesiaManfred Stober, Stuttgart University of Applied SciencesEberhard Gülch, Stuttgart University of Applied Sciences Michael Hahn, Stuttgart University of Applied Sciences Al Rasmussen, University of Washington EESAndreas Vieli, Durham University
INSTAAR Univ. of Colorado NSF Arctic Program
Columbia Glacier, Alaska W.T. Pfeffer
Collaborative Research: IPY: Dynamic Controls on Tidewater Glacier Retreat
INSTAAR Univ. of Colorado NSF Arctic Program
1979 1993
W.T. Pfeffer (CU INSTAAR) September 2004
2004
Columbia Glacier, Prince William Sound:
• 1000 km2, 50 km long in 2007• 17 km retreat since ~1982, average retreat rate ~ 0.6 km yr-1
• Flow speed as great as 27 m d-1 (9.8 km yr-1)• Average iceberg discharge 1982-2006 ~4 km3 yr-1, Max discharge 7 km3 yr-1
• Ungauged basin delivering ~2-3 km3 yr-1 fresh water to PWS• Complete photogrammetric coverage: 134 aerial photo surveys 1976-2007
Most complete data on marine-based glacier instability and dynamic retreat and best location to study ice dynamics (accelerated iceberg discharge) contributions to sea level rise.
Collaborative Research: IPY: Dynamic Controls on Tidewater Glacier Retreat
INSTAAR Univ. of Colorado NSF Arctic Program
Terminus and velocity field 8 June – 7 July 2005
2008 – 2011 Program Objectives:
Obtain better understanding of interaction between climate forcing, marine-grounded glacier dynamics, and sea level rise, using:
•Existing record of motion and retreat 1980s-present.•Seismic record of iceberg calving.•Time-lapse sequences of terminus behavior and calving.•New data acquisition including airborne radar, aerial photogrammetry, terrestrial time-lapse sequences.
Analysis, including numerical modeling.
Data archival: 30+ record, presently held in several locations, to be cataloged and placed in single, central source (NSIDC/WDC-A)
New methods:
•Improved seismic filters for identifying iceberg calving.•Automated photogrammetric analysis of time-lapse sequences
Collaborative Research: IPY: Dynamic Controls on Tidewater Glacier Retreat
INSTAAR Univ. of Colorado NSF Arctic Program
Collaborative Plan
Columbia Glacier 2008-2011Data ArchivalNew Imagery
Seismics
Data ArchivalPfeffer, O’Neel
USGSNSIDC/WDC-A
CADIS
Field CollaborationColumbia Svalbard
Pfeffer JaniaO’Neel ddddd
New Data AcquisitionPfeffer – Aerial and time lapse imagery
O’Neel – Imagery, seismicsConway – Airborne radar
Analysis
Photogrammetric Image Processing – Howat, Pfeffer, Gulch, Hahn
Terrestrial Photogrammetry – Pfeffer, O’Neel, Jania, Stober, Gulch, Hahn
Seismic – O’Neel, Rasmussen
Airborne Radar – Conway, O’Neel, Rasmussen
Modeling – Pfeffer, O’Neel, Vieli, CReSIS (van der Veen)
Outreach/EducationNSF EHR/DRL
CU-Boulder CIRES OutreachNational Geographic/NOVA
BBC
INSTAAR Univ. of Colorado NSF Arctic Program