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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

The effect of global climate change on the release of terrestrial organic carbon in the Arctic Region

Dogrul Selver, Ayca January 2014 (has links)
The Arctic Region is currently experiencing an amplified warming if compared to the rest of the world. The soils in this region store approximately half of the global soil organic carbon (OC), mainly locked in the permanently-frozen ground (permafrost). This carbon sink is sensitive to global warming meaning that the predicted warming will likely increase the thaw-release of this ‘old’ carbon. However, what happens to this remobilized OC once it is transported to the Arctic Ocean, including the potential conversion to greenhouse gasses causing a positive feedback to climate warming, remains unclear. In this work, we further investigate the fate of terrestrial derived OC (terrOC) in the Eurasian Arctic Region. The key findings of this work are: • Glycerol dialkyl glycerol tetraethers (GDGTs) and bacteriohopanepolyols (BHPs) are present in marine sediments of the Eurasian Arctic Region and the associated Branched and Isoprenoidal tetraether (BIT) and Rsoil indices can be used to trace terrOC in marine realm. However, a slight modification in the Rsoil index is suggested (R’soil). • Analyses indicate that the behaviour of BIT is largely controlled by a marine GDGT contribution while the R’soil index is mainly controlled by the removal of soil marker BHPs. Although both indices suggest a non-conservative behavior for the terrOC, this leads to differences in the estimations for the percentage terrOC present. A multi-proxy approach is essential since the use of a single-proxy approach can lead to over/under estimation.• Comparison of BIT and 13Csoc indices across the East Siberian Shelf indicates that the BIT index is possibly reflecting a predominantly fluvial input while 13Csoc represents a mixed fluvial and coastal erosion input.• The macromolecular terrOC composition varies along a west-east Eurasian Arctic climosequence and is mainly controlled by the river runoff of surface derived terrOC and wetland coverage (sphagnum vs. higher plants) but is not affected by the presence/absence of continuous permafrost. • The phenols/(phenols+pyridines) ratio was suggested as a proxy to trace terrOC at the macromolecular level along the Kolyma River-East Siberian Sea transect. The results indicate a non-conservative behavior of the macromolecular terrOC comparable to the bulk of the terrOC.All molecular analyses/based proxies used showed that the remobilized terrOC in the Eurasian Arctic region behaves non-conservatively potentially causing a positive feedback to global climate change.
12

Hard Ice, Soft Politics : EU:s och USA:s utrikespolitik i den arktiska regionen

Sandevärn, Johan January 2010 (has links)
The polar ice in the Arctic is melting resulting in new opportunities for the Arctic states to extracting vital resources and to find new shorter transport routes. Two of the largest actors who both presently have published polices towards the Arctic region is the EU and the US. This work firstly aims to offer a descriptive view of the EU and the US’ polices towards the Arctic region. Secondly, investigate the documents quantitatively and qualitatively to show weather the EU and US policies are featured by ‘hard power’ or ‘soft power’ by the research of Joseph S. Nye Jr. to find out if Robert Kagan’s hypotheses that the EU mainly use ‘soft power’ and that the US mainly use ‘hard power’. The findings showed that Kagan in this case was right about the EU and the use of ‘soft power’ but that the US mainly uses ‘soft power’ politics in their Arctic policy.
13

The Arctic Front : A study using the Securitization Theory to analyse in which way the Arctic region is perceived a security and defence concern within Swedish Arctic discourse

Risfelt, Linnéa January 2024 (has links)
The Arctic region is a region defined by change. Climate change, militarization and a growing interest from both Arctic and non-Arctic states are increasing the geopolitical significance for the region. As a consequence, concerns about the Arctic region's security and what threat the region might constitute have grown.  The following thesis seeks to study in which way the Arctic region is perceived as a security and defence concern by the Swedish government and state agencies in Swedish state discourse from first of January 2019 to the 19th of June 2023. By using arguments from the Copenhagen schools Securitization Theory, the thesis aims to understand to what extent the Swedish state discourse has securitized the Arctic region and what and/or who the is presented as security issues and defence threats. The findings argue that the Swedish Arctic discourse does not securitize the Arctic region, however, patterns of securitization could be found which indicate that the region might be securitized in the future. The Swedish Arctic discourse recognise several security issues and defence threats and present cooperation with other states as well as strengthen military capabilities in northern Sweden as countermeasures. This further indicates that the Swedish Arctic discourse recognise security and defence concerns connected to the Arctic region even if they are not presented by the terms of securitization.
14

Meaningful consultation, meaningful participants and meaning making: Inuvialuit perspectives on the Mackenzie Valley Pipeline and the climate crisis

Pokiak, Letitia 21 September 2020 (has links)
This Inuvialuit ‘story’ revolves around the Inuvialuit uprising and resurgence against government and industrial encroachment, and the self determination efforts to regain sovereignty of traditional territories. This ‘story’ also discusses how meaningful consultation made the Inuvialuit Final Agreement a reality, through which Inuvialuit land rights and freedoms were formally acknowledged and entrenched in the Canadian Constitution. Through meaningful consultation, Inuvialuit have become ‘meaningful participants’ in sustainable and future-making decisions of Inuvialuit nunangat (Inuvialuit lands) and waters, with respect to the Inuvialuit People and natural beings that Inuvialuit depend upon and maintain relationship with. As ‘meaningful participants’, Inuvialuit have the sovereign rights to “make meaning” and carve out a future as a sovereign nation within the country of Canada. This Inuvialuit ‘story’ is told with an informal framework through which it decolonizes academia, while also highlighting Indigenous voice through an Indigenous lens and worldview. The government and industry are called upon to meaningfully consult with Indigenous Peoples who have not only inhabited Turtle Island for millennia, but who have inherent Indigenous rights and freedoms, as Indigenous embodiment and well-being, and temporality and future-making are entangled with homelands. / Graduate

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