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Ice Dynamics And Surface Glaciology Along Us Itase Traverse Routes In East Antarctica, Gordon Hamilton
Ice Dynamics And Surface Glaciology Along Us Itase Traverse Routes In East Antarctica, Gordon Hamilton
University of Maine Office of Research Administration: Grant Reports
This award supports a series of field measurements that will improve our understanding of the East Antarctic ice sheet. The objectives of this project are to take advantage of the overland traverse logistics framework provided by US ITASE and to collaborate with other US ITASE investigators to 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. In addition, the variability (both spatial and temporal) in snow accumulation rates will be assessed using shallow ice cores and ground-penetrating radar profiling, and will provide …
Itase Synthesis Workshop, Paul Mayewski
Itase Synthesis Workshop, Paul Mayewski
University of Maine Office of Research Administration: Grant Reports
This award supports a workshop to bring together scientists involved in the International Trans-Antarctic Scientific Expedition (ITASE). Since 1999 the US has supported a program of traverses across both East and West Antarctica (US ITASE). US ITASE is part of the ITASE multi-national effort to understand the past 200-1000+ years of climate change over Antarctica and the Southern Ocean. ITASE is organized under the auspices of Scientific Committee for Antarctic Research (SCAR) and now comprises twenty-one countries. The international representatives from ITASE have met several times in the past to discuss national traverse plans; coordinate efforts; synthesize results; and develop …
Mass Balance And Accumulation Rate Along Us Itase Routes, Gordon Hamilton
Mass Balance And Accumulation Rate Along Us Itase Routes, Gordon Hamilton
University of Maine Office of Research Administration: Grant Reports
The primary research activities in this project involved our participation in the four US ITASE field seasons (1999-2003). As part of the field program we collected ~5,500 km of continuous, precise GPS data along the traverse route. These geodetic data are used by ourselves and several other US ITASE investigators. We also installed 15 new mass balance (coffee can) stations in rarely visited regions of West and East Antarctica. Several shallow firn cores were collected to study local variability in snow accumulation around deeper 200-year ice core sites. As part of our collaboration with NASA, we performed detailed 3-dimensional mapping …
Sea Level Pressure Variability Over The Southern Indian Ocean Inferred From A Glaciochemical Record In Princess Elizabeth Land, East Antarctica, Cunde Xiao, Paul Andrew Mayewski, Dahe Qin, Zhongqin Li, Mingjun Zhang, Yuping Yan
Sea Level Pressure Variability Over The Southern Indian Ocean Inferred From A Glaciochemical Record In Princess Elizabeth Land, East Antarctica, Cunde Xiao, Paul Andrew Mayewski, Dahe Qin, Zhongqin Li, Mingjun Zhang, Yuping Yan
Earth Science Faculty Scholarship
A 250-year, high-resolution, multivariate ice core record from LGB65 (70degrees50'07"S, 77degrees04'29"E; 1850 m asl), Princess Elizabeth Land (PEL), is used to investigate sea level pressure (SLP) variability over the southern Indian Ocean (SIO). Empirical orthogonal function (EOF) analysis reveals that the first EOF (EOF1) of the glaciochemical record from LGB65 represents most of the variability in sea salt throughout the 250-year record. EOF1 is negatively correlated (95% confidence level and higher) to instrumental mean sea level pressure (MSLP) at Kerguelen and New Amsterdam islands, SIO. On the basis of comparison with NCEP/NCAR reanalysis, strong correlations were found between sea-salt variations …
Surface "Waves" On Byrd Glacier, Antarctica, D. Reusch, Terence J. Hughes
Surface "Waves" On Byrd Glacier, Antarctica, D. Reusch, Terence J. Hughes
Earth Science Faculty Scholarship
Byrd Glacier has one of the largest ice catchment areas in Antarctica, delivers more ice to the Ross Ice Shelf than any other ice stream, and is the fastest of these ice streams. A force balance, combined with a mass balance, demonstrates that stream flow in Byrd Glacier is transitional from sheet flow in East Antarctica to shelf flow in the Ross Ice Shelf. The longitudinal pulling stress, calculated along an ice flowband from the force balance, is linked to variations of ice thickness, to the ratio of the basal water pressure to the ice overburden pressure where Byrd Glacier …
Science Management For The United States Component Of The International Trans-Antarctic Expedition, Paul Mayewski
Science Management For The United States Component Of The International Trans-Antarctic Expedition, Paul Mayewski
University of Maine Office of Research Administration: Grant Reports
US ITASE is effectively a polar research vessel. It offers the ground-based opportunities of traditional style traverse travel coupled with the modern technology of GPS, crevasse detecting radar, satellite communications and multi-disciplinary research. By operating as a ground-based transport system US ITASE offers scientists the opportunity to experience the dynamic environment they are studying. US ITASE also offers an important interactive venue for research (currently eleven integrated science projects) similar to that afforded by oceanographic research vessels and large polar field camps, without the cost of the former or the lack of mobility of the latter. More importantly the combination …