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Articles 91 - 105 of 105
Full-Text Articles in Physical Sciences and Mathematics
Chemical Composition Of A High Altitude Fresh Snowfall In The Ladakh Himalayas, Paul Andrew Mayewski, William Berry Lyons, N Ahmad
Chemical Composition Of A High Altitude Fresh Snowfall In The Ladakh Himalayas, Paul Andrew Mayewski, William Berry Lyons, N Ahmad
Earth Science Faculty Scholarship
Studies of the chemical constituents in Antarctic and Greenland snow and ice cores have proven to be extremely useful for determining the composition of the atmosphere during past climatic events (Boutron and Delmas, 1980; Herron, 1982) and hence provide data concerning climatic change. Despite the potential for the collection of similar types of information from high altitude temperate glacier snow and ice cores, their study has been limited. In addition, unlike polar ice sheets, high altitude temperate glaciers are not only close to populated area but have higher accumulation rates. Owing to the latter, preservation of detailed records on sub-annual …
Ice Mass Fluctuations In Northernvictoria Land, Paul Andrew Mayewski
Ice Mass Fluctuations In Northernvictoria Land, Paul Andrew Mayewski
Earth Science Faculty Scholarship
[From the introduction] Rennick Glacier is one of the major ice drainages for the northern Victoria Land sector of East Antarctica. Unlike glaciers farther south along the Transantarctic Mountains, Rennick Glacier does not drain into the Ross Ice Shelf but flows directly into a seasonally ice-covered ocean. Therefore, current fluctuations of this glacier are unhampered by the dampening effects of the Ross Ice Shelf. The primary controls on the activity of this glacier and others in this region are mass balance and sea level.
Source And Climatic Implication Of The Reactive Iron And Reactive Silicate Concentration Found In A Core From Meserve Glacier, Antartica, Paul Andrew Mayewski, William Berry Lyons
Source And Climatic Implication Of The Reactive Iron And Reactive Silicate Concentration Found In A Core From Meserve Glacier, Antartica, Paul Andrew Mayewski, William Berry Lyons
Earth Science Faculty Scholarship
Glaciochemistry has recently provided a useful tool in the study of snow accumulation rates (Herron and Langway, 1979; Bulter et al., 1980 Warburton and Young, 1981; Mayewski et al., in press) and the elucidation of long-term climatic change (Delmas et al., 1980; Thompson and Mosley-Thompson, 1981) as well as the definition of aerosol/precipitation source areas (Warburton and Linkletter, 1978). Recent glaciochemical work from Antarctica has suggested that although cations associated with seasalt(Na, Mg, Ca and K) decrease in concentration as one proceeds inland, crustally-derived chemical species such as Al and Fe remain relatively constant in snow and ice (Boutron and …
Geochemical And Glacio-Geomorphic Implications Of Basalt Weathering In The Queen Maud Mountains, Antarctica, R. W. Talkington, Paul Andrew Mayewski, H. E. Gaudette
Geochemical And Glacio-Geomorphic Implications Of Basalt Weathering In The Queen Maud Mountains, Antarctica, R. W. Talkington, Paul Andrew Mayewski, H. E. Gaudette
Earth Science Faculty Scholarship
Summary. The weathering of a suite of basalt clasts. that have been transported by mass wasting downslope in the Cumulus Hills region of the Queen Maud Mountains. Antarctica. is examined from both geochemical and glacio-geomorphic viewpoints. Chemical weathering. predominantly oxidation and hydration. increases in severity from clast core to rim for the suite. These weathering processes and concomitant formation of a weathering rind are suggested to be an accumulative process. culminating in the disaggregation of the rock due in part both to the chemical breakdown of the interstitial and intersertal basaltic glass and to physical weathering processes. Mass wasting rates …
Upper Rennick Glacier Ice Massfluctuation Study, Paul Andrew Mayewski
Upper Rennick Glacier Ice Massfluctuation Study, Paul Andrew Mayewski
Earth Science Faculty Scholarship
Glacial geologic mapping conducted during the 1974-75 field season revealed that at least two glacial events have affected the upper Rennick Glacier region: an older Evans glaciation probably correlative with a major expansion of the east antarctic ice sheet, and the Rennick glaciation, which since the end of the late Wisconsin has been in a retreat phase (Mayewski, Attig, and Drewry 1979). Ice surface reconstructions suggest that (1) in the area of the current Rennick Glacier grounding line, approximately 120 kilometers inland from its current terminus, Evansice was at least 1,000 meters higher and Rennick ice as much as 600meters …
Reconnaissance Glacio-Chemical Studies In The Indian Himalayas, Paul Andrew Mayewski, William Berry Lyons, Nasseruddin Ahmad
Reconnaissance Glacio-Chemical Studies In The Indian Himalayas, Paul Andrew Mayewski, William Berry Lyons, Nasseruddin Ahmad
Earth Science Faculty Scholarship
Analysis of reactive silicate, ammonium, phosphate, iron and sodium from cores taken from three glaciers in the Kashmir portion of the Himalayas are reported as the first in a series of glacio-chemical studies designed to produce proxy paleoclimatic data for this region. This study stresses the elevation dependency of such studies and for the chemical species analyzed which are most reliable for the purpose of the study.
Acidity Of Recent Himalayan Snow, William Berry Lyons, Paul Andrew Mayewski, Nasseruddin Ahmad
Acidity Of Recent Himalayan Snow, William Berry Lyons, Paul Andrew Mayewski, Nasseruddin Ahmad
Earth Science Faculty Scholarship
Surface snows collected at various elevations in the Indian Himalayas were analyzed in the field for pH as part of a broader study of the chemistry. The pH values are lower than the predicted ≅5.6 for unpolluted precipitation. Analysis of NO3 + NO2, Cl, SO4 and NH4 indicate that these low pH values are not completely due to the presence of strong mineral acids. The strong correlation of pH with elevation (i.e. temperature) suggests that the low pH values are due to the snow being supersaturated with CO2.
Ice Mass Fluctuations In Victoria Land, Antarctica, Paul Andrew Mayewski, Jon M. Hassinger
Ice Mass Fluctuations In Victoria Land, Antarctica, Paul Andrew Mayewski, Jon M. Hassinger
Earth Science Faculty Scholarship
[From the introduction] During the 1980-81 field season we conducted a two-part program: the first part was spent on the Rennick Glacier in northern Victoria Land, and the second in the ice-free valleys of southern Victoria Land. The primary objective of the program was to help elucidate the glacial and climatic history of Transantarctic Mountains ice masses by interpreting the records available from the spectrum true glaciers to rock glaciers.
An Example Of Eskers Formed In Stagnant Ice, David H. Coupland, Paul Andrew Mayewski
An Example Of Eskers Formed In Stagnant Ice, David H. Coupland, Paul Andrew Mayewski
Earth Science Faculty Scholarship
Study of stratified glacial deposits near Farmington, New Hampshire reveals that the retreat of Late Wisconsin ice in this area proceeded by means of ice-marginal stagnation. Eskers in t his area were formed within localized ice masses a t or near the base of thin ice by streams which had dendritic patterns and were subaerially exposed.
Characteristics And Significance Of Rock Glaciers In Southern Victoria Land, Antarctica, Paul Andrew Mayewski, Jon Hassinger
Characteristics And Significance Of Rock Glaciers In Southern Victoria Land, Antarctica, Paul Andrew Mayewski, Jon Hassinger
Earth Science Faculty Scholarship
[From the introduction] Rock glaciers, large-scale masses of frozen debris...form a group of features that, because of their dependence on temperature and precipitation, can be used as monitors of climatic change.
Glaciology And Glacio-Geomorphology In Victoria Landand Queen Maud Mountains, Paul Andrew Mayewski
Glaciology And Glacio-Geomorphology In Victoria Landand Queen Maud Mountains, Paul Andrew Mayewski
Earth Science Faculty Scholarship
During the past year, data analysis has been under-taken on the recent and past dynamics of several northern Victoria Land glaciers, notably Rennick Glacier; the dynamics of selected rock glaciers in Wright Valley; and on the weathering characteristics of dolorites in the Queen Maud Mountains.
Past Levels And Present State Of Northern Victoria Land Glaciers, Paul Andrew Mayewski
Past Levels And Present State Of Northern Victoria Land Glaciers, Paul Andrew Mayewski
Earth Science Faculty Scholarship
Before 1973, movement of the Ross Ice Shelf had been measured near the Transantarctic Mountains (Swithinbank, 1963), near Ross Island (Stuart and Heine, 1961) and near the ice front and to the south of Roosevelt Island (Dorrer et at., 1969). Robin (1975), assuming steady state, extrapolated these data across the ice shelf by applying volume conservation principles to measured ice thickness profiles of the ice shelf.
Weathering Stages Of A Tholeiitic Basalt (Dolerite), Queen Maud Mountains, Paul Andrew Mayewski
Weathering Stages Of A Tholeiitic Basalt (Dolerite), Queen Maud Mountains, Paul Andrew Mayewski
Earth Science Faculty Scholarship
The sparsity of datable material and key horizons throughout most of the Transantarctic Mountains requires that much of the mapping and correlation of glacial deposits, especially moraines, be based primarily on qualitative techniques. One qualitative method is to characterize the degree of weathering of clasts covering these deposits (Behling, 1971; Calkin, 1971; Nichols, 1971; and Mayewski, 1975). Lacking, however, is a detailed understanding of the role and method of weathering. To help solve this problem, soil studies have been made by Claridge and Campbell (1968) in the Shackleton Glacier region and Everett and Behling (1968), Linkletter (1972), Behling (1971), and …
Glacial Geologic Investigation Of Upper Rennick Glacier Region, Northern Victoria Land, Paul Andrew Mayewski
Glacial Geologic Investigation Of Upper Rennick Glacier Region, Northern Victoria Land, Paul Andrew Mayewski
Earth Science Faculty Scholarship
The 1974-1975 field season was spent investigating the upper Rennick Glacier area (figure) for (1) the relationship between the glacial history of the study area and the glacial histories already defined for more southerly sectors of the Transantarctic Mountains, (2) the history and dimensions of former fluctuations of the east antarctic ice sheet, Rennick Glacier, and its tributaries, as recorded in glacial deposits, and (3) the significance of this area in paleoclimatic reconstructions of Antarctica and the world.
Glacial Geology Near Mcmurdo Sound And Comparison With The Central Transantarctic Mountains, Paul Andrew Mayewski
Glacial Geology Near Mcmurdo Sound And Comparison With The Central Transantarctic Mountains, Paul Andrew Mayewski
Earth Science Faculty Scholarship
(From summary, pp. 105-106) In the central Transantarctic Mountains, the Sirius Formation consists of both a lower massive till and an upper assemblage of interlayered till and stratified lenses. Deposits of the Sirius Formation found in the McMurdo region contain only the lower massive till. The lower massive till of the Sirius Formation is thought to be a basal till because of extremely strong fabric, high concentration of faceted and striated pebbles, and heterogeneous particle sizes (clay to boulders). Fabrics observed in the basal till indicate that the ice that deposited the Sirius Formation, although displaying a much higher surface …