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 199 for “"climatic changes"”.
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Climatic changes in temperature and salinity in the subtropical North Atlantic
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1993.
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Biogeography, ecology and conservation of Paradisaeidae: Consequences of environmental and climatic changes
… their conservation. For example, under future climatic conditions and considering loss of forest cover, Astrapia nigra may face extinction within just 2-4 decades. Generally, under future climatic conditions, BOP distributional areas decrease. Relatively few BOP species face distributional …
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Lacustrine Turbidites from Tropical African Lakes as Indicators of Hydrologic and Climatic Changes
… lake basins are proven indicators of hydrologic changes, yet their usefulness as recorders of tropical paleoclimate variability has long been overlooked. The primary focus of this dissertation research is to investigate the late Quaternary hydroclimatic changes in tropical Africa, using …
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Benthic environmental responses to climatic changes during the late Quaternary: a micropalaeontological and geochemical approach
… within upwelling regions responded to past rapid climatic changes. Within this thesis, a multiproxy approach is applied to two marine sediment cores from two coastal upwelling sites in the low latitude subtropical Atlantic. With a focus on benthic foraminiferal faunal analyses, the response of the …
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The Role of the Ocean in MIS 4 Climatic Changes and Atmospheric CO₂ Variability: a Geochemical Fingerprinting Approach
… revolution, humans have caused profound climate changes, primarily by releasing geological carbon into the atmosphere and increasing atmospheric CO<sub>2</sub>, with current levels reaching >400ppm, a concentration unprecedented in the last 800ka. This has led to far-reaching socioeconomic …
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Determination of Amino Acid-N in Deep-Sea Sediments and the Relationship Between Amino Acid Levels in Three Cores From the Argentine Basin and Past Climatic Changes
Made available in DSpace on 2014-12-10T17:12:41Z (GMT). No. of bitstreams: 1 6915282.pdf: 3548143 bytes, checksum: ce558e3d20b91acba4b34513af9c9eb0 (MD5) Previous issue date: 1969
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Paleoenvironment and paleoclimate of NE Pangea in early Permian-linking chemo- and cyclo-stratigraphy, Bogda Mountains, NW China
… responses of Earth Systems to environmental and climatic perturbations of diverse magnitudes and time scales in Bogda Mountains, NE Pangea. Field investigations, petrographic observations, and geochemical analyses have been used to interpret paleoenvironment and paleoclimate in cm-m-scale …
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The evaluation of NARCCAP regional climate models using the North American Regional Reanalysis
… climate must first be evaluated using past climatic data. In this study, a comparative analysis examining mean surface-air temperature and daily accumulated precipitation differences between RCM projections from the North American Regional Climate Change Assessment Program (NARCCAP) and …
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Chemostratigraphic correlation and Pb-Pb dating of carbonate sequences in the external Gariep belt and Kango inlier of the Saldania belt in Namibia and South Africa
… carbonate deposits, indicating possibly rapid climatic changes from icehouse to greenhouse conditions. Such sequences also occur in the Pan-African Gariep Belt and in the Kango inlier of the Saldania Belt in Namibia and South Africa. Correlation of these sequences with others has been …
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The past and future climatic suitability of arabica coffee (Coffea arabica L.) in East Africa.
… of plant and animal species have shown that climatic changes affect species distributions. Global circulation models suggest climatic change over the next century, and predict warmer temperatures, and increasingly variable precipitation in East Africa. Whilst several studies have modelled the …
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Using a multiproxy analysis of springbok fossils to track 2 million years of vegetation changes experienced by hominins in southern Africa.
A causal link between climatic changes and hominin evolution is an established one, yet the exact dynamics of this relationship is debated. Key climatic changes, such as the intensification of the Northern Hemisphere Glaciation, the onset of the Walker Circulation and the Mid-Pleistocene …
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Varve Chronology, Proxy Calibration, and Holocene Climate of Minnesota
Despite the numerous Holocene paleoclimatic records from the North American continent, few existing records from the American Midwest have adequate chronological controls, marking it problematic to link regional climatic changes to possible larger-scale forcing. With solid 14C chronologies, the …
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Mesoscale Wind and Temperature Changes over Peatlands of the Hudson Bay Lowlands: impacts on the Surface Energy Balance and Net CO2 Exchange
… respiration to global warming and moisture changes. The Hudson Bay Lowlands (HBL) region of Canada is the second largest peat-accumulating complex in the world that is strongly influenced by the cold air masses originating off the Hudson Bay. Recent warming has caused observed changes in the …
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Geochemistry of slow-growing corals : reconstructing sea surface temperature, salinity and the North Atlantic Oscillation
… skeleton is secreted. δ18O of the coral skeleton changes based on both temperature and the δ18O of sea water (δOw), and δOw is proportional to sea surface salinity (SSS). Understanding long-term climate variability requires the reconstruction of key climate parameters, such as sea surface …
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Late Quaternary climate variability and terrestrial carbon cycling in tropical South America
… 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 climate change and the age structure of terrestrial biospheric carbon exported from two …
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Spatial estimation of future temperature changes over Africa
… since time immemorial. However, these long-term changes are very important because of some of the consequences to mankind. Because the changes are small ones in relation to daily experiences, many people find it difficult to perceive and accept these changes. This might cause doubts in the minds …
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Late quaternary environmental reconstruction and climate modelling in the winter rainfall region of the Western Cape, South Africa
… this region is imperative in understanding the climatic changes that have occurred during the Late Quaternary, with a view to improved palaeclimatic modelling. The spatial distribution of studies for the Late Quternary in the southwestern Cape is uneven and palaeoenvironmental reconstructions …
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Portable housing : an exploration into lightweight housing for remote scientific research
… maintain its waterproofness, and responds to the climatic changes of its surroundings by opening or closing as temperature and conditions warrant. It is, hopefully, much more livable than a tent.
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Plants as biotic indicators of Neogene palaeoenvironmental evolution in the Cape Floristic Region
… Proteaceae) to infer (i) the relative roles of climatic changes and neotectonic uplift in shaping the CFR since the Early Miocene, and to detemine (ii) whether contrasting evolutionary processes (adaptive versus non-adaptive) exhibit spatial structuring within the flora, given the complex …
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