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Showing 1 to 14 of 14 for “"Palaeoclimatology"”.
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Palaeoclimatology, stratigraphy and biotic responses in the middle Eocene
The Middle Eocene (37 to 49 million years ago, Ma) was characterised by warmer global temperatures and higher atmospheric carbon dioxide (pCO2) levels than today with only<br/>small/non-existant icesheets. Because predicted pCO2 levels for the coming century have not been seen on Earth since at …
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Speleothem Palaeoclimatology in the Maya Lowlands of Northwestern Yucatán, Mexico
The sociopolitical and demographic changes in the Maya civilisation during the Terminal Classic Period (800 – 1000 CE) are increasingly thought to coincide with climate change, specifically drought. Two challenges facing interdisciplinary analysis of the complex interactions between climate and …
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High resolution palaeoceanography and palaeoclimatology from mid and high latitude Late Cretaceous laminated sediments
Late Cretaceous laminated diatomaceous sediments from the Marca Shale (California) and CESAR 6 core (Arctic Ocean) have been analysed using scanning electron microscopy techniques and found to contain marine varves. The varve interpretation is based on the pervasive occurrence of laminae types that …
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Palaeoclimatology of the late Palaeocene to middle Eocene: geochemical records of stable and transient climate states
The late Palaeocene to late Eocene period of Earth's history is characterised by remarkable change. Temperate ice free poles at the beginning of this period gradually cooled until permanent ice formed on Antarctica around 33.5 million years before present (Ma) and sea ice formed in the Arctic. The …
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A phylogenetic study of the Cynipoidea (hymenoptera)
… distribution, plate tectonics, palaeobotany, palaeoclimatology, the origin of hyperparasitism and the adaptive characters associated with xylophagous hosts were all considered. All the available fossil cynipoids were examined and the evolutionary history, holophyly, and relationships of the …
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Tracking climate signals in tropical trees
… multidisciplinary research in high-resolution palaeoclimatology.
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Advanced methods for analysing and modelling multivariate palaeoclimatic time series
The separation of natural and anthropogenically caused climatic changes is an important task of contemporary climate research. For this purpose, a detailed knowledge of the natural variability of the climate during warm stages is a necessary prerequisite. Beside model simulations and historical …
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Holocene climate change and peatland dynamics in southern Sweden based on tree-ring analysis of subfossil wood from peat deposits
Dendrochronological analysis was applied to subfossil remains of Scots pine (Pinus sylvestris L.) buried in South Swedish peat deposits. By cross-dating Swedish bog-pine ring-width (RW) chronologies with corresponding material from North-west Germany, three Swedish RW chronologies were assigned …
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Palaeoceanographic conditions and palaeoproductivity changes from the sub-Antarctic island South Georgia since the late deglacial, using marine micropalaeontology and geochemistry
This thesis presents a high-resolution multiproxy reconstruction of palaeoceanographic conditions and palaeoproductivity on the South Georgia shelf spanning the late deglacial through the Holocene. South Georgia lies within the path of the Antarctic Circumpolar Current (ACC) and the Southern …
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The Quaternary evolution of the mid-Norwegian continental margin
In this thesis, high-resolution two- and three-dimensional seismic reflection datasets are used to examine the Quaternary Naust Formation on the mid-Norwegian continental shelf and slope, both at a high level of detail and over a huge areal extent of over 150,000 km2. First, the analysis of …