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 10 of 10 for “"glacials"”.
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Dinoflagellate cyst record and paleoceanography through the Pliocene–Pleistocene transition at ODP Site 1143, southern South China Sea
… (gonyaulacoid) taxa increased during interglacials whereas those of heterotrophic (protoperidinioid) taxa increased during glacials, particularly around the pronounced glacial stages MIS G6, 104 and 100. Increases of these heterotrophic taxa during glacials are consistent with 1) reduced …
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Pollen and grain size records in abyssal sediments of the northwest Pacific Ocean as proxies of Plio-Pleistocene climate change /
… The winter monsoon is further enhanced during glacials due to the expansion of desert and steppe environments at the expense ofwoodlands and forests recorded by the composition of palynological assemblages. The late Pliocene-Pleistocene glacials at ODP Sites 1 179, 881, and 882 are …
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Molecular evolutionary analysis of the American pika (Ochotona princeps)
… were located at lower elevations during glacials, and shifted upslope during interglacials. In this scenario, pikas would have experienced increased selective pressure to develop adaptations to hypoxia. Here, I use a candidate gene approach to identify molecular signals of adaptation in …
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From Continental Margins to the Deep Ocean
… ~620 kyr, with particulate control during interglacials and diffusion during glacials. Site 679 records stronger Pliocene anoxia linked to tectonic changes, while Site 682 shows a shift to better oxygenation over time. In the Guaymas Basin, past anoxia was stronger than today, with Mo mainly …
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The influence of differential production and dissolution on the stable isotope composition of planktonic foraminifera
… Preservation in the Atlantic during interglacials and in the Pacific during the glacials makes the isotopic composition lighter. The net effect is amplification of glacial-interglacial amplitude in the Atlantic and reduction of the amplitude in the Pacific.
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Chemostratigraphy of the Early Paleoproterozoic carbonate successions (Kaapvaal and Wyoming cratons)
… the Neoproterozoic record, carbonates cap the glacials. However, the relationship between biogeochemical cycling of carbon and ice ages has not been fully appreciated. This research involved the sedimentology and isotope stratigraphy of carbonates and shales in Paleoproterozoic …
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Orbital and Suborbital Climate Variability during the Pliocene Intensification of Northern Hemisphere Glaciation
… Pliocene biological pump was stronger during glacials than<br/>interglacials.<br/>In Chapter 4, an inferred secular productivity shift is investigated using calcareous nannofossil<br/>assemblages. Assemblage shifts at an equatorial Pacific and a North Atlantic Ocean site support<br/>the …
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Aspects of Neogene palaeoceanography in the southern Tasman Sea (DSDP site 593)
… coiling zones, all of which are associated with glacials, specifically Zones Mi5 and Mi6, and an unnumbered glacial interval. This co-occurrence is interpreted as reflecting oceanic reorganisation caused by the glacials, resulting in slight shallowing of the permanent thermocline. This shallowing …
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Investigations of the geomorphologic and pedologic system of sedimentary vega deposits from Lanzarote (Canary Islands) supported by luminescence dating – important steps towards their palaeoclimatic interpretation
… sediment sequences. We could demonstrate that glacials and stadials were characterised by higher soil moisture than interglacials and interstadials. When comparing our results with other palaeoclimatic studies from a broader region, we can show that the causes for periods of enhanced humidity …
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Sedimentation on the continental margin off the Orange River and the Namib Desert
… shifts of climatic belts during Quaternary interglacials and the reverse movement during glacials is assessed. Recent terrigenous sediments are derived by erosion of poorly consolidated Karoo sediments in the catchment of the Upper Orange. Erratic but powerful floods transport the sediments to …