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 25 for “"aridification"”.
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Spatial and Seasonal Variations in Aridification Across Southwest North America
… spatial and seasonal variations of the projected aridification is important for understanding the potential impacts of climate change on SWNA regional hydrology. We compare the projected trends in P, E, and P−E in CMIP5 global climate model projections, for the northern and southern subregions of …
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Aridification of the Indian subcontinent during the Holocene : implications for landscape evolution, sedimentation, carbon cycle, and human civilizations
The Indian monsoon affects the livelihood of over one billion people. Despite the importance of climate to society, knowledge of long-term monsoon variability is limited. This thesis provides Holocene records of monsoon variability, using sediment cores from river-dominated margins of the Bay of …
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Aridification of the Indian subcontinent during the Holocene : implications for landscape evolution, sedimentation, carbon cycle, and human civilizations
The Indian monsoon affects the livelihood of over one billion people. Despite the importance of climate to society, knowledge of long-term monsoon variability is limited. This thesis provides Holocene records of monsoon variability, using sediment cores from river-dominated margins of the Bay of …
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The biotic effects of tertiary geoclimatic change in the southern hemisphere
… that have experienced elevated levels of ongoing aridification – sub-Saharan (particularly Southern) Africa and Australia. I used standard methods from the molecular phylogeneticists’ toolbox (e.g. tree building using maximum likelihood and Bayesian approaches, haplotype networks, uncorrected …
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Insights into the genomic histories of diverse human populations using whole-genome sequencing analysis.
… overlapping the archaeologically-documented aridification events, with Arabians decreasing in size with the onset of the desert climate in Arabia ~6 kya while the Levantine bottleneck overlaps the 4.2 kiloyear aridification event. I also identify an ancestry that is associated with the spread …
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Molecular systematics, biogeography and dating of the tribe Haemantheae (Amaryllidaceae) and the phylogeography of Clivia
… with the late Miocene/Pliocene and the aridification and formation of a Mediterranean-type climate in southwestern Africa. In contrast, Gethyllis reflects a gradual diversification from 20-8Ma before the onset of aridification and the establishment of the Mediterranean-type climate. …
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Vulnerability of U.S. river basins to water shortage over the 21st century
… and drier conditions meaning higher chances of aridification. Second, the impact of climate change on hydroclimatic conditions of U.S. national forests (NFs) and national grasslands (NGs) was investigated. The results of this study indicate that NFs and NGs are more likely to experience larger …
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Assessing the feasibility of a weather index insurance for the semi-arid region of Brazil
… chapters. Firstly, it was shown that aridification is indeed a major threat to the livelihood of the population of the Brazilian semi-arid region. Secondly, it was identified that crop yield responses to weather conditions considerably vary in space and that an expressive portion of …
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Alluvial sedimentology and geomorphology of a cut and fill sequence on the Dassieboskloof River, Wuppertal, Southwestern Cape
… when assessing and managing potential future aridification and its impact on this fragile landscape.
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Assessing Stakeholders' Perceptions of Water Sharing Arrangements in the South Platte River Basin
… trends, as well as to prolonged drought and aridification of the region, water markets have emerged to transfer water from agricultural to municipal use. Farms and rural areas may face adverse economic and social repercussions from permanent transfers, however. As an adaptation to these water …
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Water Literacy in Drought-Prone Regions: Case Studies from Aurora, Colorado, USA and Cape Town, Western Cape, South Africa
… are regions experiencing climate shocks and aridification from rising global temperatures. In order to stretch limited water resources using equitable water policies, conservation programs, and alternative water sourcing, water managers must invest in a water literate citizenry. Water …
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Data-Driven Modeling of the Lake Chad Basin Hydrologic Systems
… this vital lake has rapidly fallen due to abrupt aridification. The scarcity of topographical, geological, and hydrological data makes forecasting hydrologic systems in the basin difficult and hinders advanced research and studies of the basin. This research is intended to identify the main …
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Cenozoic evolution of the Pamir Salient; timing, mechanisms and paleo-environmental impacts : constraints from the Aertashi section, western Tarim Basin
… seasonal with evidence of increased aridity. Aridification was interrupted by a short period of increased humidity at ~17.6-15 Ma which can be linked to the mid-Miocene climate optimum, or a facies change. Limited comparative studies make climatic conclusions tentative.
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Pollen and grain size records in abyssal sediments of the northwest Pacific Ocean as proxies of Plio-Pleistocene climate change /
… silicate material in abyssal marine sediments. Aridification of the Asian interior due to the phased uplift of the Himalayan-Tibetan Plateau created the modem East Asian Monsoon system dominated by a strengthening of the winter monsoon. The winter monsoon is further enhanced during glacials due …
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Controls on sedimentation in submarine canyons: Nazare, Setubal and Cascais canyons, West Iberian Margin
… interval corresponds to both a regional aridification event that affected the<br/>Mediterranean and northern African regions, and to a decline in rising sea level. A<br/>combination of the two events is interpreted as being the direct cause of the cessation in<br/>sedimentary activity on …
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Systematic studies of the South African Campanulaceae sensu stricto with and emphasis on generic delimitations
… climatic and topographical changes such as aridification and continental uplift on the subcontinent that started during the Oligocene. The phylogenetic hypothesis was also used to trace the evolution of nine characters considered important in the circumscription of genera. An uncontradicted …
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Reconstructing the late pleistocene palaeoenvironment of the Richtersveld using fossil charcoal
… an increase in rainfall at the LGM, and a steady aridification towards the terminal Pleistocene. However, Spitzkloof's charcoal records provide little evidence to suggest that the LGM supported a more mesic vegetation community than more recent time-periods. Instead, results suggest that the …
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Phylogenetic Studies of the Laurels and Heathers (Ericaceae: Ericoideae, Phyllodoceae and Cassiope Clades)
… in North America impacted by cooling and aridification during the Eocene and Miocene, and later by glacial cycles in the Pliocene and Pleistocene. x The moss heathers (Cassiope) were the focus of the third project. This genus has been associated with virtually all major clades within the …
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Ancient origins of a diverse stygofaunal group: The Australian Bathynellidae (Crustacea)
… The molecular clock analysis suggests that aridification processes only partly influenced the diversification, while most of their diversity predate the establishment of the drought climate. The results indicate very old origins dated back to the end of Devonian-early Carboniferous, and a …
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Tulipa: the taxonomy and evolutionary history of the genus and its impact on conservation priorities in Central Asia
… evolutionary history, and linking speciation to aridification, mountain building, and global cooling. Finally, we modelled the impacts of climate change on tulip species in Central Asia showing the large negative impact this threat will have. This information was then used in the Red Listing of a …
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