Global ETD Search
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Showing 1 to 20 of 87 for “"sediment core"”.
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The geologic history of Lake of the Woods, Minnesota, reconstructed using seismic-reflection imaging and sediment core analysis
… of the best-preserved sequences of Lake Agassiz sediments are found in remnant lake basins where erosional processes are less pronounced than in adjacent higher-elevation regions. Lake of the Woods (LOTW), Minnesota, is among the largest of the Lake Agassiz remnant lakes and is an ideal location …
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Design and Testing of a Hadal Sediment Sampling System
Sediment cores are conventionally gathered to collect data on seabed chemical and mineral composition. These samples are important in determining the health of the surrounding environment and, if sediment layers are preserved, assessing the environmental history and trajectory of our ocean floors. …
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The Use of Diatoms to Infer Environmental Change of the Lower White River, Southeastern Arkansas
… the major 2008 spring flood. The flood water and sediment deposited in oxbow lakes were analyzed for water chemistry, sediment geochemistry and diatom assemblages and used as an analogue for past floods. The 2008 spring flood inundated and homogenized the entire floodplain; also represented by the …
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Sediment Phosphorus Cycling in a Managed System Irondequoit Bay, N.Y.
… Bay, NY, an embayment of Lake Ontario. Sediment core incubation experiments and phosphorus water column profiles were used to quantify the release rate of phosphorus from the deepwater sediments of Irondequoit Bay during summer periods of low hypolimnetic oxygen. The top 25 cm of …
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Palaeoenvironmental reconstruction and geoarchaeology of the Cuatro Cienegas Basin, NE Mexico, from the late Pleistocene to the present
… This project has analysed a 15 m carbonate sediment core for multi-proxy palaeoenvironmental information and combined this with stable isotope, modern hydrological and geoarchaeological information in the Cuatro Cienegas Basin.
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A multi-proxy study of the Kalkkop impact Crater Lake deposits in south-central South Africa: implications for late neogene climate evolution
… that are mainly carbonate precipitates. A 90 m sediment core from the Kalkkop Crater Lake was investigated using sedimentology, palynology and geochemical analysis. The KK1 core, along with the other two boreholes (KK2 and KK3), comprise of finely laminated and massive, structureless carbonates …
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Assessing changes in pollen assemblage and charcoal accumulation during known changes in climate from c. 5,400 to 3,300 Years Before Present at the forest-prairie ecotone in Alberta, Canada
… variations in pollen and charcoal preserved in a sediment core from Chauvin Lake were analyzed over several diatom-inferred moisture-cycles from c. 5,400 to 3,300 YBP. Changes in landscape vegetation were inferred by variation in both the percent relative abundance and influx rates of pollen taxa …
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Reconstructing deglacial ocean ventilation using radiocarbon : data and inverse modeling
… and inverse modeling. First, based on a sediment core that is absolutely dated from wooden remains, I argue that the deglacial 14C reservoir age of the upper East Equatorial Pacific was not very different from today. Combined with stable carbon isotope data, the results suggest that the …
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Sedimentary legacy of sockeye salmon (Oncorhynchus nerka) and climate change in an ultra-oligotrophic, glacially-turbid British Columbia nursery lake
… lakes and recent studies of sockeye nursery lake sediments in Alaska have used indicators of spawner density (ä15N) and algal production (fossil pigments and diatoms) to show that lake trophic status is often regulated by climate and harvest via MDN from adult spawners. However, the strength of …
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Sedimentary legacy of sockeye salmon (Oncorhynchus nerka) and climate change in an ultra-oligotrophic, glacially-turbid British Columbia nursery lake
… lakes and recent studies of sockeye nursery lake sediments in Alaska have used indicators of spawner density (ä15N) and algal production (fossil pigments and diatoms) to show that lake trophic status is often regulated by climate and harvest via MDN from adult spawners. However, the strength of …
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Reconstructing deglacial ocean ventilation using radiocarbon : data and inverse modeling
… and inverse modeling. First, based on a sediment core that is absolutely dated from wooden remains, I argue that the deglacial ¹⁴C reservoir age of the upper East Equatorial Pacific was not very different from today. Combined with stable carbon isotope data, the results suggest that the …
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Analysis of laminated sediments from Lake DV09, northern Devon Island, Nunavut, Canada
A 147cm sediment core from Lake DV09, northern Devon Island, Nunavut, Canada (75° 34'34"N, 89° 18'55"W) contains annually-laminated (varved) sediments, providing a 1600-year record of climate variability. A minerogenic lamina deposited during the annual thaw period and a thin deposit of …
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Compartmentalization in the northern segment of the Brazos River Alluvium aquifer.
… This study utilizes spatial analysis, sediment core, and field observations to characterize how the relationship between the Brazos River and bedrock boundaries of the aquifer may compartmentalize groundwater flow within the Brazos River Alluvium aquifer.
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Tracing viable bacteria in Wadden Sea sediments using phospholipid analysis
… different types of lipids from bacteria and sediments. Special emphasis was placed on the analysis of intact phospholipids by HPLC-ESI-MS/MS, because phospholipids appear to be suitable biomarkers to trace viable bacteria. The specificity of phospholipids as biomarkers was tested by …
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The Paleolimnology of Sodus Bay
… of diatom valves preserved in a 1-meter sediment core extracted from the Bay. Total phosphorus analysis also was performed. Removed with a KB corer in May 1998, the core was sectioned into 1 cm samples, which were freeze dried and 210Pb dated. Coverslips were prepared using Battarbee …
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DYNAMIC EQUILIBRIUM BEACH PROFILES: FORCES OF OFFSHORE SEDIMENT TRANSPORT IN MARYLAND’S CHESAPEAKE BAY
… to estimate the quantity and quality of yearly sediment mass that is likely to be added by erosion. Data were collected in 2008 at ten sites along the Maryland shoreline of the Chesapeake Bay and compared to both empirical and theoretical models of offshore profiles. The data collected at each …
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The Effect of Historic Shipwrecks on Sediment Microbiomes in the Northern Gulf of Mexico
… commonly associated with that habitat (i.e., a core microbiome). Core microbiomes have been identified for a variety of natural marine habitats including methane seeps, wood falls, octocoral, and deep-sea sediments. However, it was unknown if the presence of man-made structures on the seafloor, …
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From grain to floodplain: evaluating heterogeneity of floodplain hydrostratigraphy using sedimentology, geophysics, and remote sensing
… representation of alluvial aquifers. We combine sediment core descriptions, hydraulic conductivity estimates from slug tests, ground-penetrating radar (GPR), historical maps of former channels, LiDAR-based elevation and Normalized Difference Vegetation Index data to infer 3-D fluvial …
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Reconstructing climate from the Dead Sea sediment record using high-resolution micro-facies analyses
The sedimentary record of the Dead Sea is a key archive for reconstructing climate in the eastern Mediterranean region, as it stores the environmental and tectonic history of the Levant for the entire Quaternary. Moreover, the lake is located at the boundary between Mediterranean sub-humid to …
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A biogeochemical investigation of Trunk River Lagoon, Falmouth, Massachusetts
… within Trunk River Lagoon, encompassing sediments, microbial blooms, and mats. Through a multi-faceted approach, the research uncovers the interplay between natural processes and anthropogenic influences, shedding light on the evolutionary trajectory of this aquatic ecosystem. From …
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