Mass Balance and Accumulation Rate Along US ITASE Routes
Entry ID:
Hamilton_0196441
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Summary
Abstract:
ICE DYNAMICS AND SURFACE GLACIOLOGY ALONG US ITASE TRAVERSE ROUTES IN EAST ANTARCTICA Antarctica is a key component of the Earth system. The ice sheet and its fringing ice shelves and sea ice play pivotal roles in the planet's radiation dynamics, in the formation of cold deep bottom water that drives ocean circulation, and in the modulation of global sea ... levels. Small changes in the Antarctic cryosphere driven either by internal dynamics or external forcings, can potentially lead to significant changes in other components of the Earth system. Our ability to properly assess future global changes requires that we accurately characterize the current behavior and status of the Antarctic Ice Sheet. This proposal requests support for a series of experiments that will contribute to our understanding of this key Earth system. The objectives of this proposal are to take advantage of the logistics framework provided by US ITASE, and collaborate with other US ITASE investigators to: 1. Calculate rates of ice sheet thickness change (mass balance) on domes, along elevation contours and along flow lines in East Antarctica using precise global positioning system methods, and assess the causes of observed imbalances; 2. Assess variability (both spatially and temporally) in snow accumulation rates using shallow ice cores and ground-penetrating radar profiling, and provide the capability to deduce true past climate variation in accumulation rates in ~200-year long ice core records by measuring ice motion and upglacier gradients in accumulation rate; and 3. Study patterns and causes of the onset of streaming flow in the catchments of selected large outlet glaciers draining through the Transantarctic Mountains. Objectives 1 and 2 are primary goals of ITASE. Objective 3 allows for a more robust interpretation of mass balance changes that might be observed. The work will be conducted along the proposed US ITASE traverse route from South Pole to Northern Victoria Land. This route travels across the East Antarctic plateau, roughly parallel to the Transantarctic Mountains. Several orthogonal satellite traverses are planned, each of which follow a flow line of a major outlet glacier.
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Description:
The Antarctic Glaciological Data Center (AGDC) at the National Snow and Ice Data Center (NSIDC) archives and distributes Antarctic glaciological and cryospheric system data collected by the U.S. Antarctic Program.
Description:
US ITASE International Trans-Antarctic Scientific Expedition
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Data Set Progress
PLANNED
Data Center
National Snow and Ice Data Center
Data Center URL:
http://nsidc.org
| Data Center Personnel |
Name:
NSIDC
USER SERVICES
Phone:
+1 (303) 492-6199
Fax:
+1 (303) 492-2468
Email:
nsidc at nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City:
Boulder
Province or State:
CO
Postal Code:
80309-0449
Country:
USA
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NSIDC Antarctic Glaciological Data Center
Data Center URL:
http://nsidc.org/agdc/
| Data Center Personnel |
Name:
ROB
BAUER
Phone:
303-492-2378
Fax:
303-492-2468
Email:
bauer at nsidc.org
Contact Address:
University of Colorado
Cooperative Institute for Research in Environmental Sciences
CIRES 449 UCB
City:
Boulder
Province or State:
CO
Postal Code:
80309
Country:
USA
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Personnel
Role:
INVESTIGATOR
Email:
gordon.hamilton at maine.edu
Contact Address:
Climate Change Institute
Department of Earth Sciences
University of Maine
5790 Bryand Global Sciences Center
City:
Orono
Province or State:
ME
Postal Code:
04469-5790
Country:
USA
Role:
DIF AUTHOR
Phone:
303-492-2378
Fax:
303-492-2468
Email:
bauer at nsidc.org
Contact Address:
University of Colorado
Cooperative Institute for Research in Environmental Sciences
CIRES 449 UCB
City:
Boulder
Province or State:
CO
Postal Code:
80309
Country:
USA
Publications/References
Hamilton, G.S. and Spikes, V.B., "Assessing the performance of satellite altimeter derived digital elevation models of Antarctica using precision kinematic GPS profiling.", Global and Planetary Change, vol. 42(1-4), (2004), p. 17. Spikes, V.B., Arcone, S.A., G.S. Hamilton, S. Kaspari and P.A. Mayewski, "Variability in accumulation rates from GPR profiling on ... the West Antarctic plateau", Annals of Glaciology, vol. 39, (2004), p. 238. Hamilton, G.S., "Topographic forcing of local accumulation rate variability at South Pole", Annals of Glaciology, vol. 39, (2004), p. 214. Spikes, V.B., G.S. Hamilton, B. Csatho and I.M. Whillans, "Thickness changes on Whillans Ice Stream and Ice Stream C, West Antarctica, derived from airborne laser altimeter measurements.", Journal of Glaciology, vol. 49, (2003), p. 223. Kaspari, S.D., P.A. Mayewski, D.A. Dixon, V.B. Spikes, S.B. Sneed, M.J. Handley & G.S. Hamilton, "Climatic variability in West Antarctica derived from annual accumulation rate records from ITASE firn/ice cores", Annals of Glaciology, vol. 39, (2004), p. 585. Jacka, T.H., G.S. Hamilton & 8 others, "A strategy for the collection and synthesis of Antarctic Ice Sheet mass balance data", Global and Planetary Change, vol. 42(1-4), (2004), p. 1. Arcone, S.A., V.B. Spikes & G.S. Hamilton, "Stratigraphic continuity in 400-MHz radar profiles in West Antarctica.", Annals of Glaciology, vol. 39, (2004), p. 195. Arcone, S.A., V.B. Spikes & G.S. Hamilton, "Deformation of polar firn by differential accumulation and ice flow: interpretation of a 400-MHz short-pulse radar profile from West Antarctica", Journal of Glaciology, vol. 51, (2005), p. 407. Hamilton, G.S., V.B. Spikes & L.A. Stearns, "Spatial patterns in mass balance of the Amundsen Sea and Siple Coast sectors of West Antarctica", Annals of Glaciology, vol. 41, (2006). Arcone, S.A., V.B. Spikes & G.S. Hamilton, "Phase structure of radar stratigraphic horizons within Antarctic firn", Annals of Glaciology, vol. 41, (2006). Spikes, V.B., "A mass balance study of the West Antarctic Ice Sheet." , bibl. PhD Dissertation, University of Maine, Orono, Maine, 98pp., (2003).
Creation and Review Dates
DIF Creation Date:
2006-03-30
Last DIF Revision Date:
2009-01-08
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