Estimating the Salinity of Subglacial Lakes From Existing Aerogeophysical DataEntry ID: creyts_0636584
Abstract: This award supports a project to estimate the salinity of subglacial Lake Vostok, Lake Concordia and the 90 deg.E lake using existing airborne ice-penetrating radar and laser altimeter data.
A change in personnel during the course of the grant moved the direction toward dynamic drainage and water flow beneath glaciers and ice sheets with particular emphasis on the interior of Antarctica and overdeepenings.
Purpose: These lakes have been selected because of the availability of modern aerogeophysical data and because they are large enough for the floating ice to be unaffected by boundary stresses near the grounding lines. The proposed approach is based on the assumption that the ice sheet above large subglacial lakes is in hydrostatic equilibrium and the density and subsequently salinity of the lake's water ... can be estimated from the (linear) relationship between ice surface elevation and ice thickness of the floating ice. The goal of the proposed work is to estimate the salinity of Lake Vostok and determine spatial changes and to compare the salinity estimates of 3 large subglacial lakes in East Antarctica. The intellectual merits of the project are that this work will contribute to the knowledge of the physical and chemical processes operating within subglacial lake environments. Due to the inaccessibility of subglacial lakes numerical modeling of the water circulation is currently the only way forward to develop a conceptual understanding of the circulation and melting and freezing regimes in subglacial lakes. Numerical experiments show that the salinity of the lake's water is a crucial input parameter for the 3-D fluid dynamic models. Improved numerical models will contribute to our knowledge of water circulation in subglacial lakes, its effects on water and heat budgets, stratification, melting and freezing, and the conditions that support life in such extreme environments.
Start Date: 2007-05-01Stop Date: 2012-04-30
ISO Topic Category
Data Set Progress
Phone: (845) 365-8368
Email: tcreyts at ldeo.columbia.edu
Lamont-Doherty Earth Observatory, Columbia University 109B Oceanography 61 Rt. 9W
Province or State: NY
Postal Code: 10964-8000
Role: TECHNICAL CONTACT
Phone: 845 365 8598
Fax: 845 365 8179
Email: mstuding at ldeo.columbia.edu
Lamont-Doherty Earth Observatory 61 Route 9W
Province or State: NY
Postal Code: 10964
Wolovick, M.J. and R.E. Bell, and T.T. Creyts, and N. Frearson, "Identification and routing of subglacial water networks under Dome A", The Journal of Geophysical Research --- Earth Surface Processes, p. , vol. , (2012). Submitted
Creyts, T.T. and G.K.C. Clarke and M. Church, "Glaciofluvial sediment redistribution across basal overdeepenings and the relation to glaciohydraulic supercooling", The Journal of Geophysical Research --- Earth Surface Processes, p. , vol. , (2012). Near submission (final review before submission),
Creation and Review Dates
DIF Creation Date: 2012-08-07
Last DIF Revision Date: 2012-08-10