Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 6 of 6
Full-Text Articles in Physical Sciences and Mathematics
Holocene Paleo-Environmental Variability Reconstructed From A Lake Sediment Record From Southeast Greenland, Gregory A. De Wet
Holocene Paleo-Environmental Variability Reconstructed From A Lake Sediment Record From Southeast Greenland, Gregory A. De Wet
Masters Theses 1911 - February 2014
Arctic climate variability over the Holocene has been both extensive and, at times, abrupt. Current understanding of these changes is still quite limited with few high-resolution paleoclimate records available for this period. In order to place observed and predicted 21st century climate change in perspective, reliable and highly resolved paleo-reconstructions of Arctic climate are essential. Using an 8.5 m sediment core from Nanerersarpik Lake, this project will characterize climate changes during the Holocene, including the deglacial transition, the rapid changes that are known to have occurred around 8,200 years ago, the transition from Holocene thermal maximum (HTM) to the …
A Speleothem-Based High Resolution Reconstruction Of Climate In Southeastern Brazil Over The Past 4,100 Years, Brandon L. Taylor
A Speleothem-Based High Resolution Reconstruction Of Climate In Southeastern Brazil Over The Past 4,100 Years, Brandon L. Taylor
Masters Theses 1911 - February 2014
Isotopic investigations of speleothem CR1 from Cristal Cave in southeastern Brazil have established a high-resolution record of climate change extending 4,100 years prior to sample collection in 2007. A total of 14 subsamples were collected from CR1 for U/Th age determination. ICP-MS analysis yielded very precise ages with analytical errors (2σ) averaging ± 13 years. An initial growth rate of .062 mm y-1 for the first 2860 years is followed by a rate of .08 mm y-1 for the remaining growth period allowing for sampling of δ18O at sub-decadal resolution. Stable isotope analyses show a large range of δ18O values …
Understanding The Depth And Nature Of Flow Systems In The Nashoba Terrane, Eastern Massachusetts, U.S.A., John P. Diggins
Understanding The Depth And Nature Of Flow Systems In The Nashoba Terrane, Eastern Massachusetts, U.S.A., John P. Diggins
Masters Theses 1911 - February 2014
Igneous and metamorphic rock units have long been considered marginal aquifers yet they are a significant source for potable drinking water in many areas worldwide. Additionally, use of these systems is on the rise due to many factors including, contamination and overuse of surficial systems, as well as expanding population and drought. The Nashoba Terrane is a fault-bounded block of high-grade, steeply dipping metavolcanic and metasedimentary rock located in eastern Massachusetts, U.S.A. The Nashoba is northeast trending, extending from Oxford, MA to the Gulf of Maine south of Newburyport, MA. Seventeen previously drilled wells throughout the Nashoba were selected for …
Using The Oxidation State Of Iron Plagioclase To Evaluate Magma Oxygen Fugacity: A Micro-Xanes Study, Don Lac
Using The Oxidation State Of Iron Plagioclase To Evaluate Magma Oxygen Fugacity: A Micro-Xanes Study, Don Lac
Masters Theses 1911 - February 2014
No abstract provided.
Environmental Reconstructions From Laminated Lake Sediments, Lake C3, Ellesmere Island, Canadian High Arctic, Kathryn S. Zalzal
Environmental Reconstructions From Laminated Lake Sediments, Lake C3, Ellesmere Island, Canadian High Arctic, Kathryn S. Zalzal
Masters Theses 1911 - February 2014
Sediments in Lake C3, Ellesmere Island, Canada, contain annual laminations, providing a record of sediment accumulation for 1900+ years. Marine sediments are also present at base of cores, recording lake isolation following isostatic rebound of the Taconite Inlet region in the mid-Holocene. Beyond weak correlations with snowfall and summer temperature and precipitation, varve thickness comparisons with instrumental data were largely unsuccessful, likely due to turbidite-induced erosion. However, summer climate conditions are of key importance in varve thicknesses at many Arctic sites and we expect this to be true at Lake C3. Trends in the thickness record also correspond in approximate …
Effects Of Anthropogenic Stage Fluctuations On Surface Water/Ground Water Interactions Along The Deerfield River, Massachusetts., Brandon J. Fleming
Effects Of Anthropogenic Stage Fluctuations On Surface Water/Ground Water Interactions Along The Deerfield River, Massachusetts., Brandon J. Fleming
Masters Theses 1911 - February 2014
Understanding the connection of surface waters to ground-water systems is important when evaluating potential water resources. In the past surface waters and ground-water have been viewed as two different sources of water but more commonly now they are viewed as one connected resource (Winter et al, 1998). The nature of connection between surface and ground-waters varies depending on climatic and geologic settings, as well as anthropogenic influences such as ground-water pumping and manipulation of river flows by dams. This thesis takes advantage of daily stage changes in the Deerfield River to investigate surface water interactions with ground-water in Charlemont, MA. …