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Showing 1 to 14 of 14 for “"Glacial-interglacial cycles"”.
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Ecology and climates of early Middle Pleistocene interglacials in Britain
… Middle Pleistocene (MIS 19-13, c. 780-430 ka) interglacial environments in Britain. This period is characterised by globally muted (i.e. low amplitude) glacial-interglacial cycles, which increased in amplitude c. 430 ka with the Mid-Brunhes Transition (MBT). However, the influence of these …
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Quaternary geology of the German North Sea and Western Irish Sea Mud Belt: revised stratigraphies, geotechnical properties, sedimentology and anthropogenic impacts
… years) is characterised by fluctuation between glacial and interglacial periods leading to the present interglacial, the Holocene. In comparison to preceding periods it was believed the Holocene represented a time of relative climatic stability. However, recent work has shown that the Holocene …
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Gas-generated fractures and methane venting in a deepwater Arctic setting
… two million years ago until the present. During glacial-interglacial cycles, gas venting behavior in shallow water (< 400 m) close to the West Svalbard margin can be explained by gas hydrate dissociation due to pressure reduction caused by lowering of relative sea level or isostatic rebound. …
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Resolving abrupt palaeoenvironmental changes in a lake sediment sequence from Ioannina, northwest Greece
… with a vegetation record which spans multiple glacial-interglacial cycles. This PhD builds upon earlier work at Ioannina, seeking to characterise last glacial millennial-scale palaeoenvironmental change at the site through study of core I-08. Detailed visible and ‘crypto-’ tephra analysis …
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Exploring high-resolution carbon isotopes in archaeological charcoal as a rainfall seasonality proxy
… shifts in these zones during Late Pleistocene glacial- interglacial cycles is crucial for both regional climate reconstructions and interpreting behavioural variability in the South African Later Stone Age (LSA) archaeological record. However, several key palaeoarchives employed to reconstruct …
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Orbital and Suborbital Climate Variability during the Pliocene Intensification of Northern Hemisphere Glaciation
… three consecutive,<br/>large, obliquity-paced glacial-interglacial cycles (marine isotope stages, MIS, 101-95), using proxy<br/>methods applied to deep-sea sediments in the equatorial oceans and the North Atlantic. In this<br/>way, I evaluate the forcing mechanisms, biogeochemical cycles and …
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Palaeoclimatology of the late Palaeocene to middle Eocene: geochemical records of stable and transient climate states
… similar to controls seen on modern day glacial { interglacial cycles. These rapid changes in the carbon cycle are shown to be inverse at the middle Eocene Climatic Optimum (MECO), where gradual warming over 400 kyr is ended abruptly by significant cooling. From the first marginal marine …
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Development of biomarker-based proxy methods for reconstructing the late Quaternary sea ice history in the Barents Sea
… and high sympagic production during the Last Glacial Maximum (LGM) definitively confirmed the presence of productive polynya throughout this glacial interval. After perennial sea ice and near-zero productivity resulted from the collapse of the Barents Sea Ice Sheet (BSIS) at the onset of …
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Reconstruction of the Late and Mid-Pleistocene climate and landscape history in SE-Central Europe - A paleopedological and geochemical multi-proxy approach in loess-paleosol studies.
… loess plateaus can be found comprising several glacial-interglacial cycles. This work focuses on key sections in the middle and lower Danube Basin to i) investigate the origin of the loess and archive genesis, ii) to set up a reliable chronostratigraphy and iii) to contribute to the …
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The Quaternary evolution of the mid-Norwegian continental margin
… on the adjacent shelves. Second, submarine glacial landforms found on the 500-km long mid-Norwegian continental shelf allow the reconstruction of the ice-sheet configuration over several Quaternary glacial–interglacial cycles. Evidence of iceberg ploughmarks found within the earliest …
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Nitrogen cycling in the subtropical southeast Atlantic and southwest Indian Oceans as recorded by the nitrogen isotopes of modern planktic foraminifera
… along its upper limb, have been tied to global glacial-interglacial cycles, highlighting the region's sensitivity to large-scale cli- mate change. The work detailed in this thesis includes the first foraminifer- bound δ15N ground-truthing studies from the southeast Atlantic and the Agul- has …
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Late Quaternary palaeoenvironments and Middle-Late Stone Age habitat preferences in the Nakuru-Naivasha Basin, Kenya: phytolith-based evidence from the site of Prospect Farm
… severe deteriorations of climate during the last glacial period. On a sub-regional scale, East Africa’s heterogeneous topography and localised expressions of regional climate is hypothesised to have created a ‘push-pull’ system in which repeated fragmentation, isolation, and expansion of …
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The Mechanism and Timescales of Soil Formation in the Hyper-arid Atacama Desert, Chile
… cap-delta 17O proxy, indicating seven wet-dry cycles, likely corresponding to possible glacial-interglacial cycles operating on the 100 ky scale.</p> <p>Crypto-biotic crusts (CBC), a consortium of pioneer species in hostile environments, may play an important role in soil evolution. Preliminary …
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Geochemistry of karst deposits in Borneo detailing hydroclimate variations in the Warm Pool across the late Pleistocene
… years ago, kybp). The record comprises an entire glacial-interglacial cycle, which allows us to investigate orbital-scale climate forcings and compare two well-dated glacial terminations in the western tropical Pacific. The ice-volume-corrected δ18O records suggest that glacial boundary condtions, …