HR: 08:45h
AN: C41D-04    [Abstracts]
TI: Application of Radio-Echo Sounding Internal Layers to Ice-Sheet Modeling
AU: Beckley, M
EM: matt@icesat2.gsfc.nasa.gov
AF: Raytheon, ITSS, NASA/GSFC, Code 971, Greenbelt, MD 20771 United States
AU: * Wang, W
EM: weili@icesat2.gsfc.nasa.gov
AF: Raytheon, ITSS, NASA/GSFC, Code 971, Greenbelt, MD 20771 United States
AU: Siegert, M
EM: M.J.Siegert@bristol.ac.uk
AF: Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, Bristol, BS8 1SS United Kingdom
AU: Morgan, V
EM: vin.morgan@utas.edu.au
AF: Australian Antarctic Division and Antarctic Climate & Ecosystems CRC, Private Bag 80, Hobart, Tas 7001 Australia
AU: Zwally, J
EM: zwally@icesat2.gsfc.nasa.gov
AF: Ocean and Ice Branch, NASA/GSFC, Code 971, Greenbelt, MD 20771 United States
AB: In recent years, ice-sheet internal layers derived from radio-echo sounding measurements are of particular interest to glaciologists because the layers are believed to contain information on ice flow and Paleoclimate records. Internal layers are considered to represent isochrones and can be dated by combining them with the associated ice cores where the age-depth relationships are known. The dated internal layers then can be used in ice-sheet modelling for model verification or model control. Here, we present the results from ice flow modelling by using dated internal layers in several regions of the Greenland and Antarctic ice sheets. Comparison of the dated internal layers with the isochrones calculated from a steady-state model is used to appraise the stability of the local ice-sheet flow, and to show the importance of ice rheology and stress configurations considered in the model. Using dated internal layers as the model control, ice flow is simulated by adjusting calculations so that the modeled isochrones match the dated layers. Our results also include using the internal layers to reconstruct the historic ice-sheet accumulation rates and thickness change.
DE: 1827 Glaciology (1863)
DE: 1863 Snow and ice (1827)
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting