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 48 for “"High Arctic"”.
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Integrated Terrestrial and Hydrological Carbon Budgets in High Arctic Watersheds
… is important for informing climate models. High Arctic regions are particularly key areas for carbon cycle research because they are understudied relative to other regions, and because accelerated climate change is altering many processes affecting carbon fluxes, with the net effect of these …
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Investigating Subsurface Flow Delivery to a Small High Arctic River
… and solutes to channels in temperate systems. Arctic systems are increasingly being shown to possess similar delivery mechanisms, however the topic is understudied, acutely so in the High Arctic. This work assesses the nature of delivery mechanisms in the High Arctic over the thaw season and in …
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Investigating dissolved organic matter cycling in High Arctic ponds and soils
… lability has been investigated extensively in Arctic lake and large river systems, however relatively little research has investigated the lability of DOM in systems with more fine scale spatial heterogeneity in environmental conditions, such as ponds and soils. Chapter 2 presents a study of …
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Biogeochemical investigations of methane-rich groundwaters in high Arctic glacial catchments
Permafrost and glaciers in the high Arctic form a near-impermeable ‘cryospheric cap’ that traps a potentially large reservoir of sub-surface methane and prevents it from reaching the atmosphere. The vulnerability of the cryosphere to climate warming is making releases of this methane possible, but …
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Arctic Char Otolith Records of Recent Limnological Change in High Arctic Lakes
Arctic lakes have been undergoing significant physical and chemical changes in recent years due to climate warming and permafrost thaw. These changes have the potential to impact organisms residing in these environments such as Arctic Char (Salvelinus alpinus) which represent the top predatory fish …
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Hydroclimatic influences on suspended sediment delivery in a small, High Arctic catchment
… (SSC) and grain size were measured at high temporal resolution through the runoff period to evaluate diurnal-, event- and seasonal-scale discharge-suspended sediment and grain size hysteresis. In addition, two models of a time-integrated suspended sediment trap, modified from Philips et …
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Biogeochemical and ecological responses to warming climate in High Arctic polar deserts
High Arctic polar deserts cover 26% of the Arctic and are found to store a larger amount of soil organic carbon (SOC) in the permafrost and to emit higher amounts of the main greenhouse gases (GHGs) than previously expected. However, the mechanisms of the main GHG production are not clear. …
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Land-atmosphere exchange of carbon in a high-Arctic wet tundra ecosystem
Arctic ecosystems play a key role in the terrestrial carbon (C) cycle, but spa-tially explicit data on the C exchange is scarce in these remote areas. The global warming is especially dominant in the Arctic, and these areas are vul-nerable to climate change. It is therefore important to quantify …
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Characterization of dissolved fluvial carbon from landscape characteristics across High Arctic headwater streams
… of carbon from the terrestrial ecosystem to the Arctic Ocean, where fluvial carbon is a product of both the source and pathway of the stream network through a watershed. Small headwater streams in the High Arctic are understudied and account for a significant amount of the freshwater geochemical …
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Landscape and environmental controls on soil organic matter decomposability in the High Arctic
… in vegetation and soil moisture across the High Arctic landscape influences soil organic carbon (SOC). My results demonstrate that vegetation type significantly influences the size of labile and more persistent SOC pools and labile SOC mineralisation rates in the High Arctic. Wet sedge (WS) …
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Assessing Thule Inuit impacts on High Arctic lakes and ponds : a paleolimnological approach
… nutrient concentrations above average for the High Arctic. Elevated levels of nitrogen and phosphorus were observed in the pond indicating the continuing influence of nutrient inputs centuries after the abandonment of the camp. Meanwhile, on Bathurst Island, the orientation of the Deblicquy …
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Limnological and paleolimnological investigations of environmental change in three distinct ecosystem types, Canadian High Arctic
… biological remains preserved in the sediments of Arctic lakes and ponds in the Canadian High Arctic are important indicators of environmental change, especially as long-term instrumental data are often lacking. Although recent studies have underscored variability amongst these aquatic ecosystems, …
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Geomorphic and Fluvial Response to Recent Permafrost Disturbances in a High Arctic River, Cape Bounty, Nunavut
… 8 km2 West River catchment at the Cape Bounty Arctic Watershed Observatory (CBAWO), Melville Island, Nunavut. Research was carried out in an effort to determine the longer term impacts and response of recent (2007-8) active layer detachments (ALD) on the river system. In 2010, measured ALD …
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Population ecology of landlocked Arctic charr, <i>Salvelinus alpinus L</i>., in the Canadian High Arctic
… activities. Four landlocked populations of Arctic charr, <i>Salvelinus alpinus</i> L., were surveyed at 81 oN, close to the northerly extreme of the species range. They were single-species populations consisting of two distinct size modes, "Dwarf" and "Normal" charr, but with major …
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Influence of muskox carcasses on soil nutrients and vegetation in a High Arctic ecosystem in northeast Greenland
Hræ stórra spendýra geta haft veruleg áhrif á jarðveg og gróður þar sem þau falla til, einkum sökum aukinnar næringarefnaákomu. Slík áhrif eru sérstaklega mikilvæg í næringarsnauðum vistkerfum, s.s. freðmýrum, þar sem aukið framboð næringarefna getur haft langvarandi áhrif. Rannsóknir á þessum …
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Reflections of Reflections of Reflections: A Multi-Case Study of Women Educators' Callings to the High Arctic
… context so different from her own in Canada's Arctic. In order to arrive at a deeper, more intrinsic understanding of her career decisions, I explored each educators calling through three, increasingly deeper levels of reflection. In Reflections, as “in an instance of reflecting,” I explored …
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OUT IN THE COLD: THE LEGACY OF CANADA'S INUIT RELOCATION EXPERIMENT IN THE HIGH ARCTIC, 1953-1990.
… to Ellesmere and Cornwallis Islands in the High Arctic Archipelago. The reason the government gave for this operation was to alleviate overcrowded conditions in the southern Arctic, and take advantage of unused natural resources in the unpopulated regions farther north. Yet the relocated …
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