Browsing by Subject "Ilmastonmuutos"
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(2023)Climate change has been identified as one of the most critical challenges of our time globally, but studies show that the adverse effects are already culminating in sensitive areas such as southern Africa. The increase in drought and extreme weather phenomena confuses the region's hydrological cycle, which poses challenges to countries dependent on surface water. The transboundary river network requires cooperation from governments in decision-making on water use. Studies show that water scarcity often leads to increased cooperation between states, but the situation is not excluded from conflict. Water diplomacy activities aimed at cooperation have been identified in Finland as an effective way of resolving water conflicts, and the Ministry of Foreign Affairs is seeking better implementation of the paradigm within the institution. This Master's thesis examines policy documents of Southern African actors identifying water and climate-related conflict risks. The theoretical part of the thesis deals with conflict research in geography and the basis for resource conflicts and transboundary water cooperation. In addition to the theory, the thesis examines Southern Africa as an operating environment in its own chapter. The material used in research is official documents defining the use of waters by South Africa, Namibia and two regional institutions, the Southern African Development Community, and the Oranje-Senqu River Commission. The relationship between the actors and their approach to the risks identified in the literature has been examined through content analysis and interpretative policy analysis. The thesis has been carried out as a mandate towards a Water Cooperation and Peace – Finnish Water Way project funded by the Ministry of Foreign Affairs, the Ministry of Agriculture and Forestry and the Ministry of the Environment. The Finnish Environment Institute and the Finnish Institute for International Affairs coordinate the project. The study's key findings indicate that the documents defining water use in the region are outdated. In international research, climate change has been identified as a key risk in the region, but only the relevant Southern African Development Community document has comprehensively addressed the issue. South Africa is launching a new strategy in 2023, in which, according to the draft used in thesis, the theme has also been taken fully into account. According to the results, Namibia has been active as a single actor in the climate change debate as early as the turn of the 2010s. According to the study's results, the scarcity of water resources and the challenges associated with their distribution impact the region's political power balance. However, despite the asymmetrical nature of power, the initiatives taken by the actors are, in principle, cooperative and therefore peace-building. According to the paper, the region has strong institutions, and decision-making is based on both regional and international norms.
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(2020)Arctic peatlands are globally extensive and long-lasting storages of carbon and are therefore important ecosystems controlling global carbon cycling. Changes in climate affect peatlands’ ability to accumulate carbon through changes in hydrology and water table level, vegetation, soil temperature and permafrost thaw. As climate warming is projected mostly to northern and arctic regions, it may change the peatlands’ capacity to sequester and release carbon as carbon dioxide and methane. In this Master’s Thesis I studied how the past climate changes are reflected in carbon accumulation rates over the past millennia. Known climate anomalies, such as the Medieval Climate Anomaly, Little Ice Age and the last rapid warming starting from 1980, and their impact on average long-term apparent rate of carbon accumulation were studied from the peat proxies. 15 peat cores were collected from northern subarctic Swedish Lapland and from North-East European Russia. Cores were collected from the active peat layer above permafrost that is known to be sensitive to climate warming. Cores were dated with radiocarbon (14C) and lead (210Pb) methods and peat properties and accumulation patterns were calculated for one centimeter thick subsamples based on chronologies. The Little Ice Age and the last rapid warming affected the carbon accumulation rate considerably whereas for Medieval Climate Anomaly period the peat records did not show very distinctive response. During the Little Ice Age the carbon accumulation rates were low (median 10,5 g m-2v-1) but during the post-Little Ice Age and especially during the last warm decades after 1980 carbon accumulation rates have been high (median 48,5 g m-2v-1). Medieval Climate Anomaly had only a minor positive effect on accumulation rates. On average, the long-term apparent rate of carbon accumulation during the past millennia was 43,3 g m-2v-1 which is distinctly higher than the previously studied rate of 22,9 g m-2v-1 for northern peatlands (p-value 0,0003). Based on results it can be concluded that warm climate periods accelerated the carbon accumulation rate whereas during cold periods accumulation decelerated. Warm climate prolongs the growth period and accelerates the decomposition of peat; cold climate shortens the period of plant growth and thickens the permafrost layer in peatlands, respectively. However, peat layers that are formed after the Little Ice Age are incompletely decomposed which amplifies the carbon accumulation rate partly. Nevertheless, permafrost thawing has been shown to increase accumulation rates, as well. Studying past carbon accumulation rates helps to understand the peatland and carbon cycling dynamics better. Even though accumulation rates reveal a lot about carbon sequestration capabilities of peat, it does not indicate whether a peatland has been a carbon sink or a source.
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