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Millennially averaged accumulation rates for the Lake Vostok region inferred from deep internal layers Entry ID: Vostok_accum |
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Summary
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Abstract:
The depths of radar-detected internal layers can be used to infer the spatial variability of accumulation rates. Here we infer accumulation rates from three radar layers (26, 35 and 41ka old) in the Vostok Subglacial Lake region using the local-layer approximation (LLA). The LLA assumes that the strain-rate history of a particle traveling through the ice sheet can be approximated by the vertical strain-rate profile at the current position of the particle, which we further assume is uniform. We use the LLA to map accumulation rates over a 150 km by 350 km area. The LLA accumulation-rate map shows higher values in the northwestern corner of our study area and lower values near the downstream shoreline of the lake. The LLA-inferred accumulation-rate patterns over the three time periods are all similar, suggesting that the regional pattern did not change significantly between the start of the Holocene and the last ~20 ka of the last Glacial Period.
Purpose: Accumulation rates and their spatio-temporal variability are important boundary conditions for ice-flow models. |
Related URL
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Link:
VIEW RELATED INFORMATION
Description: NSF Award #0538674 Abstract |
Geographic Coverage
| N: -75.6688 | S: -79.0715 | E: 80.5377 | W: 68.4102 |
| Min Altitude: 3335 M | Max Altitude: 3625 M | Min Depth: 0 | Max Depth: 0 |
Data Set Citation
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Dataset Originator/Creator:
Joseph A. MacGregor
Dataset Title: Millennially averaged accumulation rates for the Lake Vostok region |
Paleo_Temporal_Coverage
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Paleo Start Date:
41 ka
Paleo Stop Date: 0 ka Chrono Unit: Chrono Unit: |
Location Keywords
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CONTINENT
> ANTARCTICA
> Lake Vostok
GEOGRAPHIC REGION > POLAR |
Data Resolution
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Latitude Resolution:
1.5 km
Longitude Resolution: 1.5 km Vertical Resolution: N/A Temporal Resolution: 26-41 ka |
Science Keywords
| CRYOSPHERE >GLACIERS/ICE SHEETS >ICE SHEETS [Definition] |
| TERRESTRIAL HYDROSPHERE >GLACIERS/ICE SHEETS >ICE SHEETS [Definition] |
| TERRESTRIAL HYDROSPHERE >GLACIERS/ICE SHEETS [Definition] |
| CRYOSPHERE >GLACIERS/ICE SHEETS >ABLATION ZONES/ACCUMULATION ZONES [Definition] |
| CRYOSPHERE >GLACIERS/ICE SHEETS >GLACIER FACIES [Definition] |
| CRYOSPHERE >GLACIERS/ICE SHEETS >GLACIER MASS BALANCE/ICE SHEET MASS BALANCE [Definition] |
| CRYOSPHERE >GLACIERS/ICE SHEETS >GLACIER MOTION/ICE SHEET MOTION [Definition] |
ISO Topic Category
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GEOSCIENTIFIC INFORMATION
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Platform
| DHC-6 >DeHavilland Twin Otter [Information] |
Instrument
| RADAR ECHO SOUNDERS |
Project
| NSF/OPP >Office of Polar Programs, National Science Foundation [Information] |
| USAP >United States Antarctic Program [Information] |
Quality
| Please refer to MacGregor et al. (2009) for details on the quality of this dataset and assumptions used to derive the accumulation rates presented. |
Access Constraints
| N/A |
Use Constraints
| Please refer to MacGregor et al. (2009) when using this dataset. |
Keywords
| Lake Vostok |
| accumulation rate |
Data Set Progress
| COMPLETE |
Data Center
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Glaciology, Near-Surface Geophysics, Earth and Space Sciences, University of Washington
[Information]
Data Center URL: http://www.ess.washington.edu/Surface/Glaciology/
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Distribution
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Distribution_Media:
online
Distribution_Format: ASCII text Fees: none |
Personnel
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KENICHI
MATSUOKA Role: INVESTIGATOR Email: matsuoka at npolar.no Email: matsuoka at ess.washington.edu Contact Address: University of Washington Department of Earth and Space Sciences City: Seattle Province or State: WA Postal Code: 98105 Country: USA |
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MICHAEL
S.
STUDINGER Role: INVESTIGATOR Phone: 845 365 8598 Fax: 845 365 8179 Email: mstuding at ldeo.columbia.edu Contact Address: Lamont-Doherty Earth Observatory 61 Route 9W City: PALISADES Province or State: NY Postal Code: 10964 Country: USA |
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JOSEPH
ANDREW
MACGREGOR Role: INVESTIGATOR Phone: (512) 471-0411 Fax: (512) 471-8844 Email: joemac at ig.utexas.edu Contact Address: 10100 Burnet Rd, Bldg 196 City: Austin Province or State: TX Postal Code: 78758 Country: USA |
Publications/References
MacGregor, Joseph A., Kenichi Matsuoka, Michelle R. Koutnik, Edwin D. Waddington, Micheal Studinger and Dale P. Winebrenner (2009), Millennially averaged accumulation rates for the Vostok Subglacial Lake region inferred from deep internal layers, Annals of Glaciology, 50, 51, 25-34, International Glaciological Society
Creation and Review Dates
DIF Creation Date:
2011-07-05
Last DIF Revision Date:
2011-08-23
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