Millennially averaged accumulation rates for the Lake Vostok region inferred from deep internal layers
Entry ID: Vostok_accum

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Summary
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
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
Dataset Originator/Creator: Joseph A. MacGregor
Dataset Title: Millennially averaged accumulation rates for the Lake Vostok region


Paleo_Temporal_Coverage
Paleo Start Date: 41 ka
Paleo Stop Date: 0 ka
Chrono Unit:
Chrono Unit:


Location Keywords
CONTINENT > ANTARCTICA > Lake Vostok
GEOGRAPHIC REGION > POLAR


Data Resolution
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
GEOSCIENTIFIC INFORMATION


Platform
DHC-6 >DeHavilland Twin Otter    [Information]


Instrument
RADAR ECHO SOUNDERS


Project
NSF/PLR >Division 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
Glaciology, Near-Surface Geophysics, Earth and Space Sciences, University of Washington    [Information]
Data Center URL: http://www.ess.washington.edu/Surface/Glaciology/

Data Center Personnel
Name: JOSEPH ANDREW MACGREGOR
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



Distribution
Distribution_Media: online
Distribution_Format: ASCII text
Fees: none


Personnel
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


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


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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