Summary
of Field Work Proposed RTZ7 |
1997-98 |
Project
Information Package |
STI
|
| Principal Investigators: | |
| Ian
M. Whillans Department of Geological Sciences and Byrd Polar Research Center The Ohio State University Columbus OH 43210-1002 Whillans+@osu.edu |
Cornelius
J. van der Veen vanderveen.l@osu.edu |
| Project Objectives: |
| 1. Determine the extent to which lateral drag controls the motion of ice strams at 3 selected locations. |
| 2. Test whether the proportion of ice-stream driving force opposed at the sides differs according to : |
| a. outward migration rate of the margin |
| b. magnitude of driving stress |
| c. width of the ice stream |
| d. geometry of the ridge |
| 3. Measure horizontal ice advection toward the ice stream and local mass balance as an aid in deducing the processes controlling the positions of the margins. |
| Summary from SOAR proposal response: |
| Investigations will occur at the northern shear margin of tributary B2, ice stream D and ice stream E. |
| The field program consists of strain grid installaation and surveying. SOAR will provide ice-penetrating radar and laser altimeter data. |
| There are three strain grid sites each with three lines spaced 2 km apart and 30 km long, perpendicular to the shear margin and extending from close to the crevassed chaotic zone to a distance of 5 to 10 km onto the ridge. SOAR will fly along each line to provide information on ice thickness and the nature of the ice. |
| Siple Dome will be the base of operations for the proposed work during the 1997-98 field season. |
| SOAR estimates the survey requires three survey flights plus any additional reflights. Flying can be accomplished in four days, allowing additional days for weather contingencies. |
| Flight Information: |
| A. STI Flight Targets: |
| STI/TKB consists of three parallel lines approximately 60 km long each, separated by approximately 5 km |
| STI/TKD consists of three parallel lines approximately 35 km long each, separated by approximately 5 km. |
| STI/TKE consists of three parallel lines approximately 110 km long each, separated by approximately 5 km. |
| B. Coordinate System: | |
| Coordinate System | Lambert Conic Conformal |
| Grid Origin Lat. Long (deg) | -85, -180 |
| Grid Origin Shift X,Y (m) | 0.0, 222600 |
| Grid Rotation (deg) | 0 |
| Standard Parallels (deg) | -81.5, -83.5 |
| Semi-major, semi-minor axes (m) | 6378137.0, 6356752.3141 |
| C. Elevations: Surveys will be flown 350 m above the highest elevation in each block. | |
| STI/TKB: | 870 m = 2850' |
| STI/TKD: | 1530 m = 5020' |
| STI/TKE: | 900 m = 2950' |
| D. Radar Resolutions: Radar resoultions will be 20 ns everywhere, 2048 stacks, with 80 microsecond records (40 microsecond records over Ice stream B). | ||||||||||
| E. Radar Blanking: Radar blanking will occur under all circumstances when magnetic data are collected. | ||||||||||
| F. The radar altimeter will not be used during these flights. | ||||||||||
| G. . Extended Run-ins and Run-outs: 15.9 km run-ins and run-outs with explicit waypoints for all transects | ||||||||||
| H. Communication of Flight Plans: Designated Point of Contact between pilots and SOAR (either JLW or SLM) | ||||||||||
| I. Flight Sequencing: Schduled as weather permits. | ||||||||||
| J. Flight Times: Flight windows have been established consistent with low magnetic noise periods. Flight windows at 1:30am, 7:30am, and 1:30pm (local time). Windows are approximately 5 hours long. | ||||||||||
| K. Flight Planning Documents: Flight planning documents will be prepared by JLW or SLM and distributed to flight and ground crews prior to each filght. Copies of all flight plans are saved as part of SOAR flight logs. | ||||||||||
| L. Reflight Criteria: Flights will occur in sequence until the project is completed. If good quality data is collected in less than the designated number of flights, SOAR will move on to the next project. | ||||||||||
| M. Weather Contingencies: Given bad weather, a single jump of 1000' can be made during a transect to avoid icing. If clouds interfere with collection of laser data (where laser data is essential), the flight will be aborted. Flights within a set where laser is essential will be given first priority, secondary priority will be given those where laser acquisition is possible. When too many clouds, but still able to fly, plans will include those areas where the survey is laser insensitive. | ||||||||||
| N. Leap Second: n/a | ||||||||||
| O. FOP/EDS interface | ||||||||||
| P. Gravity Ties: Gravity data will be collected at Down B and South Pole, then back to Down B during the South Pole site visit. Gravity data will also be collected at Siple Dome, Down B, and back at Siple Dome in a single day, if possible. | ||||||||||
| Q. Base Station Issues: Siple Dome will be the base of operations | ||||||||||
| R. QC Review: Data will be broken out immediately after a flight. Each flight line will be given an initial review and rated for overall data quality by JLW or SLM. Determination if reflights are required will be made at that time. Science observers in the field may have acces to Quality Control products. |
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| S. GPS mask angle: 10°; if holes are introduced, decrease to 5º. | ||||||||||
| T. PST Names: File names will incorporate the SOAR project acronym (STI) for the project name with geography indicated within the sets. For Example | ||||||||||
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| U. Waypoint List |