| dc.contributor | Peter-Tamstorf, Kristianen Mikkel | |
| dc.contributor | Munch-Dristiansen, Seren | |
| dc.contributor | Aarhus University | |
| dc.creator | Gacitúa-Lovera, Guisella Fabiola | |
| dc.date | 2017-03-29T22:50:29Z | |
| dc.date | 2022-08-18T23:20:37Z | |
| dc.date | 2017-03-29T22:50:29Z | |
| dc.date | 2022-08-18T23:20:37Z | |
| dc.date | 2013 | |
| dc.date | 2012 | |
| dc.date.accessioned | 2023-08-22T01:29:12Z | |
| dc.date.available | 2023-08-22T01:29:12Z | |
| dc.identifier | http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ | |
| dc.identifier | https://hdl.handle.net/10533/180539 | |
| dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/8306099 | |
| dc.description | The research presented in this thesis results from a three year PhD-study at the Department of Bioscience at Aarhus University, formerly known as the Arctic Department at National Environmental Research lnstitute, in Denmark.Current climate changes in the High Arctic are expected to lead to long-term effects on the ecosystem function and dynamics. At the Zackenberg Research Station in Northeast Greenland ecosystem processes are routinely monitored througha comprehensive monitoring program. This PhD project investigates and discussesthe interactions between climate, the physical components of the periglacial landscape and the ecosystem. The project is based on tield surveys during 2009 and2010 but al so on data obtained through the GeoBasis section of the ZackenberqBasis monitoring programmes. Particular consideration is given to processes in the active layer such as snow, soil, and vegetation. The study improves the understanding of processes related to cold thermal regimes that will potentially change as o result of the climate changes. The methodology is based on the use of geophysicol measurements and data interpreted with respect to the ecological effects of the studied processes.Ground penetrating radar (GPR) technology was used to quantify and validatephysical and biotic interactions that can be used to improve the knowledge ofecosystem effects. Standard GPR techniques were adapted to suit Arctic ecosystem and applied to three majar ecosystem components of the Zackenberg valley: the active layer (frozen and unfrozen soil), the snowpack and frozen lakes.The first part of this thesis contains an introduction that is structured into three chapters. Chapter 1 contains the overview of the importance of Arctic research. Chapter 2 describes the fundamentals of the technique used. Analyses of field measurements are subsequently discussed with reference to the GPR research from recent decades (Chapter 3).Results are divided into three sections, corresponding to the three studied components of the ecosystem. The tirst section presents an analysis of soil water content estimations of the active layer derived from GPR data. Methods developed by several authors were tested on a study transect during the tirst tield season of the PhD project in the Zackenberg valley in spring 2009. Chapter 4 contains the results that were presented at the XIII lnternational Conference on Ground PenetratingRadar in Lecce, Italy, 2010 and are part of the IEEE Proceedings of the conference(Paper 1). A development of this work focusing on analysis of the radar signal is then introduced in Chapter 5. The radar signal was used to characterise patterns in reflections that relate to features in the active layer. Results were presented at the 6th lnternational Workshop on Advanced Ground Penetrating Radar in Aachen, Germany, 2011 (Paper 2). An expansion of this work on soil water content is given in Chapter 6 and was recently published in the Journal of Applied Geophysics (Paper 3). Subsequently, in Chapter 7, a manuscript on the analysis of the ecological link between the snowpack thickness and the distribution of vegetation types in the Zackenberg orea is presented, which was submitted to the 'Arctic, Antarctic, and Alpine Research' (Paper LJ). Finally, Chapter 8 contains a manuscript that relates to seasonal frozen formations. The Langemandsso lake at Zackenberqwas prospected using GPR, the results of which confer information relevant to theinternal structure and geomorphology of the lake and its cycling processes are scheduled to be submitted for prior to the final defence of this PhD. | |
| dc.description | PFCHA-Becas | |
| dc.description | Doctor en Ciencias de la Tierra | |
| dc.description | 78p. | |
| dc.description | PFCHA-Becas | |
| dc.description | TERMINADA | |
| dc.format | application/pdf | |
| dc.language | eng | |
| dc.relation | instname: Conicyt | |
| dc.relation | reponame: Repositorio Digital RI2.0 | |
| dc.relation | instname: Conicyt | |
| dc.relation | reponame: Repositorio Digital RI2.0 | |
| dc.relation | handle/10533/108040 | |
| dc.relation | info:eu-repo/grantAgreement/PFCHA-Becas/RI20 | |
| dc.relation | info:eu-repo/semantics/dataset/hdl.handle.net/10533/93488 | |
| dc.rights | Atribución-NoComercial-SinDerivadas 3.0 Chile | |
| dc.rights | info:eu-repo/semantics/openAccess | |
| dc.title | Soil-snow-vegetatión interactións at zackenberg, northeast greenland: a ground penetrating radar assessment | |
| dc.type | Tesis Doctorado | |
| dc.type | info:eu-repo/semantics/doctoralThesis | |
| dc.type | info:eu-repo/semantics/publishedVersion | |
| dc.type | Tesis | |
| dc.coverage | Aarhus | |
