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Geodetic Activities During the 2001 JIRP Field Season Compiled by Scott Mcgee and Walter Welsch

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Geodetic Activities During the 2001 JIRP Field Season Compiled by Scott Mcgee and Walter Welsch HE Foundation for Glacier and Environmental Research Juneau Icefield Research Program Seattle, Washington and Glaciological and Arctic Sciences Institute University of Idaho Moscow, Idaho JIRP Open File Survey Report—2001 GEODETIC ACTIVITIES DURING THE 2001 JUNEAU ICEFIELD RESEARCH PROGRAM FIELD SEASON Compiled By Scott R. McGee Foundation for Glacier and Environmental Research Prof. Dr.-Ing. Walter Welsch Dipl.-Ing. Martin Lang Universität der Bundeswehr, München With Student Contributions By Jake Amadon Ellie Boyce Eric Chin Shara Feld Colby Smith Haley Wight Foundation for Glacier and Environmental Research Juneau Icefield Research Program Seattle, Washington and Glaciological and Arctic Sciences Institute University of Idaho Moscow, Idaho JIRP OPEN FILE SURVEY REPORT—2001 Geodetic Activities During the 2001 JIRP Field Season Compiled by Scott McGee and Walter Welsch Foundation for Glacier and Environmental Research Juneau Icefield Research Program 514 East 1st Street Moscow, Idaho 83843 USA © Copyright 2001 Cover photo: Performing a GPS survey on the Vaughan Lewis Glacier, Juneau Icefield, Alaska, August, 2001. The Vaughan Lewis Glacier is known for a series of spectacular wave and band ogives at the base of the Vaughan Lewis Icefall. A longitudinal survey was performed to quantify the amplitude and wavelength of the ogives. Lakes in the troughs between several crests provided a unique challenge, requiring the combination of GPS positioning and hydrologic soundings to determine the underwater elevation of the ice surface. Photo by Scott McGee. All data contained herein were collected from 1992 to 2001 by the Foundation for Glacier and Environmental Research, Juneau Icefield Research Program with additional financial support from the University of Idaho, National Science Foundation, NASA, the Army Research Office, and the Universität der Bundeswehr, Munich, Germany. These data are available to the public at no charge for scholarly use. Researchers wishing to use the information contained herein may do so provided the author and the Foundation for Glacier and Environmental Research, Juneau Icefield Research Program are properly credited and cited as the originators of the data. Survey reports from previous field seasons of the Juneau Icefield Research Program may be obtained from the Foundation for Glacier and Environmental Research at the above address, or on the Internet at http://crevassezone.org. CONTENTS SUMMARY.............................................................................................................................................1 1. Introduction.........................................................................................................................................2 2. Survey Methods..................................................................................................................................5 2.1 Establishment of Profiles..............................................................................................................5 2.2 GPS Survey Methods ...................................................................................................................5 3. Survey Projects ...................................................................................................................................6 3.1 Transverse Profiles.......................................................................................................................7 3.1.1 Surface Velocity....................................................................................................................7 3.1.1.1 Taku Glacier ..................................................................................................................7 3.1.1.2 Icy Basin ......................................................................................................................10 3.1.1.3 Gilkey Glacier..............................................................................................................12 3.1.2 Short-term Height Change ..................................................................................................12 3.1.3 Long-term Height Change ..................................................................................................14 3.1.3.1 Taku and Demorest Glaciers........................................................................................15 3.1.3.2 Gilkey Glacier..............................................................................................................15 3.1.3.3 Lemon Glacier .............................................................................................................17 3.2 Longitudinal profiles ..................................................................................................................19 3.2.1 Surface velocity and Gradient.............................................................................................20 3.2.1.1 Taku/Matthes/Llewellyn Glaciers................................................................................20 3.2.1.2 Northwest and West Branches of the Taku Glacier.....................................................22 3.2.2 Long-term height change ....................................................................................................32 3.2.2 Long-term height change ....................................................................................................33 3.2.2.1 Taku / Matthes / Llewellyn Glaciers............................................................................33 3.2.2.2 Demorest Glacier.........................................................................................................35 3.2.2.3 Southwest Branch of the Taku Glacier ........................................................................37 3.2.2.4 Northwest and West Branches of the Taku Glacier.....................................................38 3.2.3 Longitudinal Surface Flow Times.......................................................................................42 3.3 Profile 4 ......................................................................................................................................44 3.3.1 Height Change and Local Surface Mass Balance ...............................................................45 3.3.2 Strain...................................................................................................................................53 3.4 Matthes Glacier / Llewellyn Glacier Divide...............................................................................54 3.5 Gilkey Glacier Surveys ..............................................................................................................56 3.5.1 Ogive Wavelength and Amplitude......................................................................................56 3.6 Test Pits......................................................................................................................................60 4. Future Work......................................................................................................................................61 5. Acknowledgements...........................................................................................................................61 References..............................................................................................................................................62 Appendix 1 – GPS Benchmark Coordinates..........................................................................................67 Appendix 2 – Movement Profile Flag Coordinates ...............................................................................69 Appendix 3 – Surface Movement Vectors...........................................................................................127 Appendix 4 – Short-term Height Change Graphs................................................................................134 Appendix 5 – Longitudinal Surface Flow Times.................................................................................139 Appendix 6 – Profile 4 Surface Elevations, 1993 to 2001...................................................................147 Appendix 7 – Profile 4 Surface Strain, July 19-25, 2001 ....................................................................148 Notes....................................................................................................................................................149 JIRP Survey Report — 2001 GEODETIC ACTIVITIES DURING THE 2001 JUNEAU ICEFIELD RESEARCH PROGRAM FIELD SEASON FOUNDATION FOR GLACIER AND ENVIRONMENTAL RESEARCH, JUNEAU ICEFIELD RESEARCH PROGRAM, SEATTLE, WASHINGTON SUMMARY The JIRP 2001 field season proved to be a productive one for the survey team. GPS surveys were conducted at six previously established transverse movement profiles. Four longitudinal movement profiles were extended in length, and one new longitudinal movement profile was established. Additional surveys were conducted within the wave-bulge zone of the Vaughan Lewis Glacier, including a longitudinal profile to determine the wavelength and amplitude of the ogives. Several 1995 positions on the Gilkey Glacier were also resurveyed this year, and a new benchmark was established at Knowl Point. The locations of several mass balance test pits were also surveyed. As in past years, the survey work focused on determining surface movements, surface elevations and changes, strain rates, ablation data, and local surface mass balance. Additionally,
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