Call number:
AWI G3-19-93211
;
AWI G3-19-93211(2. Ex.)
Type of Medium:
Dissertations
Pages:
viii, 220 Seiten
,
Illustrationen
Language:
English
Note:
Dissertation, Universität Potsdam, 2019
,
Table of Contents
Abstract
Zusammenfassung
1 Introduction
1.1 Scientific background
1.1.1 Permafrost - terrestrial and subsea
1.1.2 Subsea permafrost distribution
1.1.3 Relevance in the context of a changing Arctic
1.1.4 Influences on subsea permafrost
1.2 Hypotheses and objectives
1.3 Thesis organization
2 Detection of subsea permafrost degradation rates
2.1 An overview of geophysical methods and studies in subsea permafrost
2.2 Geophysical objectives
2.3 Passive seismic techniques
2.3.1 H/V passive seismics
2.3.2 Passive seismic interferometry
2.4 Instrument design & marine tests on Sylt
2.5 Arctic feasibility test site around Muostakh Island
2.6 Arctic deployment for wide area detection around Muostakh Island
3 Modelling of subsea permafrost degradation processes
3.1 An overview on subsea permafrost modelling
3.2 Salt distribution- mechanisms beyond diffusional transport
3.3 Open questions in salt transport and permafrost degradation
3.4 Modelling objectives
3.5 Study sites
3.5.1 Primary study site: Cape Mamontov Klyk
3.5.2 Secondary study sites: Buor Khaya & Muostakh Island
3.6 Developing a model for subsea permafrost
3.6.1 Thermal regime of the subsurface: governing equations of conductive heat transfer
3.6.2 Model definitions: concentration and thaw depth
3.6.3 Saline effect on the state of permafrost
3.6.4 Salt transport: governing equation & parameterizations
3.6.5 Modelling approach
3.6.6 Model testing
3. 7 Results: Influence of model parameters on subsea permafrost degradation
3.8 Discussion and implications
3.8.1 Modelled inundation parameters
3.8.2 Further factors affecting subsea permafrost degradation
3.8.3 Implications
4 From local to regional scale: Amending sparsely distributed temperature records
4.1 An overview of borehole temperature reconstruction .
4.2 On the transferability of ground to air temperatures .
4.3 Reconstruction objectives
4.4 Borehole sites and climate
4.5 Borehole temperatures
4.6 Inversion method
4.6.1 Forward model
4.6.2 Optimization
4.6.3 Sensitivity analysis
4.7 Results and discussion of the reconstruction from the permafrost boreholes
4.7.1 Recoverable period
4.7.2 Optimization
4.7.3 Surface temperature reconstructions and fit
4.7.4 Inversion method's impact on character of solution & sensitivity to temperature history parameterization
4.8 Discussion of spatial differences and implications
4.8.1 Comparison to other temperature data
4.8.2 Site differences
4.8.3 Methodological considerations
4.8.4 Implications
5 Conclusion and outlook
5.1 Outlook
Appendices
A Modelling tests for H/V method configuration
Bibliography
Acknowledgements
Location:
AWI Reading room
Location:
AWI Reading room
Branch Library:
AWI Library
Branch Library:
AWI Library
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