Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 48 for “"Glacial period"”.
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Seafloor ploughmarks on the mid-Norwegian continental shelf reveal iceberg trajectories during the last glacial period
… LGM and throughout deglaciation. In Trænadjupet glacial trough, a strong unimodal ploughmark orientation to the northwest suggests an alternative forcing to the NwAC, here interpreted as the combined action of the Norwegian Coastal Current and bathymetric constraints imposed by the ice sheet …
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Concentration and Size Distribution of Microparticles in the NGRIP Ice Core (Central Greenland) during the Last Glacial Period
… Holocene and 8000 ¹g kg¡ 1 during the last glacial maxi-mum (LGM). Strong variations of the insoluble particle mass were encountered corresponding to the Dansgaard/Oeschger (D/O) events within the last glacial period, with concentration changes by typically a factor of 8 across the rapid D/O …
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Dust and Pleistocene Ice Ages: Eolian Sediments and Climate Change at Ziegler Reservoir, Snowmass Village, Colorado
… ecosystem response, during a relatively unknown period, in which climate conditions were similar to present. Finegrained sediments at Ziegler Reservoir represent continuous deposition between ~140–55 ka (thousand years before present), spanning the close of the Bull Lake glacial period [marine …
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CHARACTERIZATION OF THE NORTHERN HEMISPHERE GLACIAL CYCLE-II AND TERMINATION FROM HIGH RESOLUTION SPELEOTHEM ISOTOPE AND TRACE ELEMENTAL TIME-SERIES DATA, SOUTHWEST UNITED STATES
… the timing and character of the Penultimate Glacial period (NH Glacial-II) and the following glacial termination (T-II) in the northern hemisphere (NH). Speleothems FS-TR3 from Fort Stanton Cave and CaCa-MSC-3 from Carlsbad Caverns National Park reconfirm the close connection between NH …
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On the external forcing of Indian Ocean climate variability across timescales
… Madagascar which spans the end of the last glacial period. Stable isotope and trace metal proxies indicate drier conditions in response to North Atlantic cooling events, such as Heinrich stadials, and wetter conditions during North Atlantic warming events, such as the Bølling–Allerød. These …
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On the external forcing of Indian Ocean climate variability across timescales
… Madagascar which spans the end of the last glacial period. Stable isotope and trace metal proxies indicate drier conditions in response to North Atlantic cooling events, such as Heinrich stadials, and wetter conditions during North Atlantic warming events, such as the Bølling–Allerød. These …
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Late quaternary valley fill sediments in the River Tyne valley: Understanding late Devensian deglaciation and early postglacial response in northern England
This thesis reconstructs part of the deglacial and early post-glacial history of the River Tyne Valley, Northumberland. Data has been gathered through description and interpretation of sedimentary sequences and stratigraphies from quarry and cut-bank exposure, the development of a geochronology was …
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Geochemical tools and paleoclimate clues : multi-molecular and isotropic investigations of tropical marine sediments and alpine ice
… has undergone dramatic changes since the last glacial period, as evidenced from Cariaco Basin (Venezuelan coast) and Peru Margin marine sediment biomarker records. Compounds derived from vascular plant leaf waxes and delivered to the marine sedimentary environment, including long-chain …
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Submarine Landforms and Late Quaternary Ice Flow in Hinlopen Strait, Northern Svalbard Margin
… on the Northern Svalbard margin. During the last glacial period, this trough is thought to have been occupied by an ice stream which flowed north across the continental slope (Ottesen et al., 2007). This project is concerned with examining the submarine landforms and acoustic stratigraphy of this …
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VOLCANIC EMISSIONS AND DISTAL PALAEOENVIRONMENTAL IMPACTS IN NEW ZEALAND
… rainfall. The Kaipo record covers the Holocene period up to recent times. Lake Rotoroa is the third site which is located inland, sheltered within the Waikato valley, an area of rich fertile soils and mild temperate climate. The Lake Rotoroa record extends to approximately 15,000 yrs BP …
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Uranium-series radionuclide records of paleoceanographic and sedimentary changes in the Arctic Ocean
… fluxes were extremely low during the late glacial, rose during the deglaciation due to particle inputs from shelf inundation, increased productivity and ice-rafted debris, and fell again following the establishment of interglacial conditions. A major event of lateral sediment …
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Uranium-series radionuclide records of paleoceanographic and sedimentary changes in the Arctic Ocean
… fluxes were extremely low during the late glacial, rose during the deglaciation due to particle inputs from shelf inundation, increased productivity and ice-rafted debris, and fell again following the establishment of interglacial conditions. A major event of lateral sediment …
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Late Quaternary climate variability and terrestrial carbon cycling in tropical South America
… trends at these two sites during the last glacial period suggest altered monsoon circulation patterns under glacial conditions, while changes in summer insolation appear to be an important control of precipitation at both sites during the Holocene. I next assess the relationship between …
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Nocturnal Lepidoptera of Midland Raised Bogs
… in water-filled depressions left after the last glacial period. Due to centuries of damaging human activities, only 1% of the living, growing active raised bog habitat remains and this is rapidly being lost. Raised bogs are important reservoirs of biodiversity, hosting many uniquely adapted plant …
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The late quaternary vegetational history of Holderness, Yorkshire
… plants into this country, particularly in Late-glacial and early Flandrian times, when the region was joined to the continent by dry land. As a distinct and somewhat isolated region of low-lying land which must have been rather waterlogged for much of Post-glacial time it would have provided a …
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Post-Glacial Fire History of Horsetail Fen and Human-Environment Interactions in the Teanaway Area of the Eastern Cascades, Washington
… by dramatic shifts in climate since the last glacial maximum and more recently, by human activity. However, it is unclear how past relationships between people, fire, and climate interacted on the landscape. The purpose of this research was to reconstruct the post-glacial fire history of a …
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Late Quaternary vegetation history of Craven, Yorkshire Dales.
… reveal varied vegetation histories from the Late Glacial period to the present day and all show signs of being influenced by changes in their arboreal structure at some time, although no two sites have exactly the same vegetation communities until around 5000 BP when the tree canopy is opened to …
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Chronology and paleoenvironment of Peoria Silt deposition and Jules Geosol development along the Illinois Valley, Illinois, USA
… were previously not well understood. This last glacial paleosol developed in thick loess deposits (Peoria Silt) proximal to the Illinois River Valley around the time of the last glacial maximum. Two sites, New Cottonwood School and Thomas Quarry, which contain the Jules Geosol, were selected …
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Deep-lake carbonates and speleothems as high-resolution archives of paleohydrology in the Bonneville Basin, UT
… to hydroclimate changes during the past glacial period; closed-basin lakes in this region have been studied for over a century. We present lake and speleothem records from the Bonneville Basin that are anchored by high-precision U-Th ages. Deep-lake carbonates are deposits that form …
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Late Quaternary climate variability and terrestrial carbon cycling in tropical South America
… trends at these two sites during the last glacial period suggest altered monsoon circulation patterns under glacial conditions, while changes in summer insolation appear to be an important control of precipitation at both sites during the Holocene. I next assess the relationship between …
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