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 75 for “"Polar regions"”.
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Liverwort-Fungal Associations: Novel Symbioses In Polar Regions?
… — and in the bryophyte enriched floras of the polar regions. This study provides the first large-scale survey of fungal colonisation of liverworts on Svalbard in the High Arctic and on South Georgia in sub-Antarctica, increasing current knowledge of these symbioses from three to 35 liverwort …
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Aerosol processes in polar regions : from formation to climatic implications
… aerosols and their intearctions with climate. Polar regions are experiencing faster warming than the Earth on average. This enhanced warming leads to many dramatic changes in the cryosphere, including rapid shrinkage of Arctic summer sea ice. Arctic ampli cation also decreases the temperature …
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Volatile Ice Deposits in Lunar Polar Regions and Their Sources
… trapping of volatiles in permanently shadowed regions (PSRs) near the rotational poles was explored using a combination of numerical models of ballistic transport of water vapour. This process included both a validated Monte Carlo model and a full lunar exospheric model, which had not …
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Advances in understanding melt-affected firn and ice cores from the polar regions
… ice core science around the world, even in the polar regions where near-surface melt and rain-on-snow events are occurring more frequently, more extensively, and adversely affect the preservation of numerous ice-core climate proxies. The age scale development for a new firn core from Young …
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Characterisation of ionospheric TEC variations over the equatorial and polar regions during solar cycle 24
The TEC variations in the equatorial and polar region are known to be high compared to the mid latitude region. Investigation on ionospheric TEC at individual regions has been carried out by many studies but the investigation between these regions simultaneously is still lacking. TEC values from …
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Coccolithophores in high latitude and Polar regions: Relationships between community composition, calcification and environmental factors
… the saturation state (calcite) and pH of these regions, the carbonate chemistry of the freshwater sources (Baltic Sea, sea-ice melt, riverine input/ terrestrial runoff) was also important and had accentuated the effects of biological activity. A multivariate approach showed that changes in pH …
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Constraining the average fill densities of Mars' lowlands and fluvial erosion of Titan's polar regions.
… the cumulative erosion around the margins of polar lakes. Images of drowned fluvial features around the lake margins, where elevated levels of hydrocarbon liquids appear to have partly flooded fluvial valleys, allow us to map topographic contours that trace the fluvially dissected topography. …
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MacKinder meets Buzan: A Geopolitical Extension to Security complex Theory with an emphasis on the Polar Regions
… a possible, even probable, future for the two Polar Regions. Each scenario depicts the world in the year 2035, when the human population and individual wealth will likely be of a magnitude greater than they are today and when the world is also detrimentally affected by an increasingly inclement …
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A Radiative Analysis of Angular Signatures and Oblique Radiance Retrievals Over the Polar Regions From the Multi-Angle Imaging Spectroradiometer
… sun), and (3) thin clouds. Thin clouds over the polar regions fit all three criteria, and are therefore more likely to be missed by visible satellite retrievals. (2) This dissertation uses the MODTRAN model to explain the angular distribution of relative brightness between clouds and the snow …
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Development of ground-based search -coil magnetometer systems in the polar regions and studies of ULF Pc 1--2 wave propagation in the ionospheric waveguide
… stamps. These instruments are deployed in the Polar regions forming high latitude networks and conjugate measurement points between the northern and the southern hemispheres. In addition to the development and installation of the magnetometers, this thesis describes analysis of the data from …
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Atmospheric Distribution and Seasonality of Airborne Polyfluorinated Compounds: Spatial and Temporal Concentration Variations from Ship-and Land-Based Measurements in Northern Germany, the Atlantic Ocean, and Polar Regions
Per- und polyfluorierte Verbindungen (PFC) sind vielfältig verwendete chemische Substanzen, die mittlerweile weltweit und in allen Umweltmedien nachgewiesen werden konnten. Einige PFC, vor allem Perfluorcarboxylate (PFCA) und Perfluorsulfonate (PFSA), sind persistent, bioakkumulativ und toxisch. …
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Tourism in polar environments - with special reference to Greenland and Antarctica
… with the impact and the management of tourism in polar environments. A perspective is given on the environmental hazards that may arise from tourist activities in polar regions, through documented examples from the impact on alpine and similar environments in other parts of the world. General …
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Uncertainty and Inequality: The Case of Northeast Brazil
… among its economic agents and among its several regions. Second, it develops a model for the purpose of analyzing inequalities. Third, it applies the model to interpret the past and present economic situation of Northeast Brazil. Finally, it considers certain policies aimed at the elimination of …
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Chemistry of the sea ice/ snowpack/ atmosphere system in coastal Antarctica
… have been known to occur during springtime in polar regions for over 20 years. During such events, ozone concentrations can fall from background amounts to below instrumental detection limits within a few minutes and remain suppressed for on the order of hours to days. The chemical destruction …
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Physiological and metabolic characteristics of polar diatoms: insights into cold adaptation and potential for biotechnology
The polar regions represent two of the most extreme environments on Earth, with sub-zero temperatures, sustained light in the summer and complete darkness in the winter. Marine diatoms are prevalent in the polar oceans, significantly contributing to primary productivity and ecosystem functioning. …
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Polar Region Sea Ice Classification With Multimodal Learning
The rapid changes in the polar regions due to climate change have significant global implications, necessitating accurate monitoring and classification of sea ice. This thesis presents a multimodal learning approach for classifying polar sea ice thickness using both satellite imagery and altimetry …
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Fungal biodiversity in extreme environments and wood degradation potential
… on one of the driest and thermally broad regions of the world, the Taklimakan Desert, with comparisons to polar region deserts. Additionally, the capability of select fungal isolates to decay lignocellulosic substrates and produce degradative related enzymes at various temperatures was …
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Assessing and Improving the Representation of Hydrologic Processes in Atmospheric, Ocean, and Land Modeling and Dataset Generation
… height. These are especially persistent in the polar regions in autumn and winter. However, Arctic inversions are the strongest in summer corresponding to the time of year that low cloud cover is the highest. Comparing the reanalysis inversions to radiosonde observations reveals some problems …
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The contribution of photography to Arctic expeditions 1851 to 1881
… of photography on expeditions outside the polar regions as a means of establishing what was possible by the photographic medium during the same period. It is shown that photography was of a lower quality and quantity compared to non polar expeditions.
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Radar Altimetric Studies of Polar Ice
… regarding snow and ice surfaces in the polar regions, where darkness and cloud cover prevail. Here, data collected in the Arctic by a Ku-band microwave radar altimeter, designed and constructed in the UK, are analysed. The two main components of this study comprise data gathered in the …
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