Collaborative Research: IPY: Dynamic Controls on Tidewater Glacier Retreat PIs: W.T. Pfeffer, CU INSTAAR/CEAE Shad O’Neel, INSTAAR and Scripps/IGPP Ian.

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Presentation transcript:

Collaborative Research: IPY: Dynamic Controls on Tidewater Glacier Retreat PIs: W.T. Pfeffer, CU INSTAAR/CEAE Shad O’Neel, INSTAAR and Scripps/IGPP Ian Howat, OSU Byrd Polar Howard Conway, University of Washington EES Collaborators: Jacek Jania, University of Silesia Manfred Stober, Stuttgart University of Applied Sciences Eberhard Gülch, Stuttgart University of Applied Sciences Michael Hahn, Stuttgart University of Applied Sciences Al Rasmussen, University of Washington EES Andreas Vieli, Durham University INSTAAR Univ. of ColoradoNSF Arctic Program Columbia Glacier, Alaska W.T. Pfeffer

Collaborative Research: IPY: Dynamic Controls on Tidewater Glacier Retreat INSTAAR Univ. of ColoradoNSF Arctic Program W.T. Pfeffer (CU INSTAAR) September Columbia Glacier, Prince William Sound: 1000 km 2, 50 km long in 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 ~4 km 3 yr -1, Max discharge 7 km 3 yr -1 Ungauged basin delivering ~2-3 km 3 yr -1 fresh water to PWS Complete photogrammetric coverage: 134 aerial photo surveys 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 ColoradoNSF Arctic Program Terminus and velocity field 8 June – 7 July – 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 ColoradoNSF Arctic Program Collaborative Plan Columbia Glacier Data Archival New Imagery Seismics Data Archival Pfeffer, O’Neel USGS NSIDC/WDC-A CADIS Field Collaboration Columbia Svalbard Pfeffer Jania O’Neel ddddd New Data Acquisition Pfeffer – Aerial and time lapse imagery O’Neel – Imagery, seismics Conway – 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/Education NSF EHR/DRL CU-Boulder CIRES Outreach National Geographic/NOVA BBC

INSTAAR Univ. of ColoradoNSF Arctic Program