Signatur:
AWI G3-20-93465
Materialart:
Dissertationen
Seiten:
xi, 113, xxxvii Seiten
,
Illustrationen, Diagramme
Sprache:
Englisch
Anmerkung:
Table of Contents
Abstract
Zusammenfassung
List of Figures
List of Tables
1. Introduction
1.1 Scientific Background
1.1.1 Arctic Climate Change
1.1.2 Permafrost Degradation
1.1.3 The Arctic Freshwater System and its Biogeochemistry
1.2 Objectives
1.3 Study Region and Methods
1.3.1 Study Area
1.3.2 Field Sampling and Measurements
1.3.3 Geochemical Analyses
1.3.4 Data Processing
1.4 Thesis Structure
1.5 Author Contributions
2. Spatial Variability of Dissolved Organic Carbon, Solutes and Suspended Sediment in Disturbed Low Arctic Coastal Watersheds
2.1 Abstract
2.2 Introduction
2.3 Study Site
2.4 Methods
2.4.1 Stream Monitoring
2.4.2 Mapping of Disturbances
2.4.3 Flux Estimates and Statistics
2.5 Results
2.5.1 Catchment Disturbance
2.5.2 Runoff and Hydrochemistry
2.5.3 Lateral Transport of Stream Water
2.5.4 Hydrochemical Composition and Fluxes in Nearby Streams
2.6 Discussion
2.6.1 Total Runoff and Water Quality
2.6.2 Water Quality Changes from Headwaters to Downstream
2.6.3 Changes in Hydrochemistry and Isotopic Composition over Time
2.6.4 Importance of Disturbances for Hydrochemistry
2.7 Conclusions
2.8 Supplementary Material
3. Terrestrial Colored Dissolved Organic Matter (cDOM) in Arctic Catchments - Characterizing Organic Matter Composition Across the Arctic
3.1 Introduction
3.2 Study Area
3.3 Methods
3.3.1 Field Methods and Hydrochemistry
3.3.2 Statistical Analyses
3.4 Results
3.4.1 Meteorological Conditions and General Hydrochemistry
3.4.2 DOC and cDOM Absorption Characteristics
3.4.3 Downstream Patterns of DOC and cDOM Along Longitudinal Transects
3.4.4 Temporal Trends ofDOC and cDOM with Changing Meteorological Conditions
3.5 Discussion
3.5.1 Limitations of cDOM Measurements from Terrestrial Sources
3.5.2 Catchment Processes and Biogeochemical Cycling
3.5.2.1 Regional Catchment Properties
3.5.2.2 Rainfall Events
3.5.2.3 Downstream Patterns and Impact of Permafrost Disturbance
3.5.3 Nature of cDOM-DOC Across the Terrestrial Arctic
3.6 Conclusion
3.7 Supplementary Material
4. Summer Rainfall DOC, Solute and Sediment Fluxes in a Small Arctic Coastal Catchment on Herschel Island (Yukon Territory, Canada)
4.1 Abstract
4.2 Introduction
4.3 Study Site
4.4 Methodology
4.4.1 Weather data
4.4.2 Hydrology
4.4.3 Suspended Sediment and Hydrochemistry
4.4.4 Flux Estimates and Statistics
4.5 Results
4.5.1 Meteorological Conditions
4.5.2 Streamflow and Electrical Conductivity
4.5.3 Transport of Suspended Sediment and Organic Matter
4.5.4 Solute Transport
4.5.5 Alluvial Fan Sampling
4.6 Discussion
4.6.1 Hydrological Response
4.6.2 Water Quality and Fluxes
4.6.3 Rainfall Response and Flow Pathways
4.7 Conclusions
4.8 Supplementary Material
5. Synthesis
5.1 Impacts of Permafrost Degradation on Stream Biogeochemistry
5.2 Controls on DOM Quality across the Arctic
5.3 Biogeochemical Fluxes from Small Coastal Catchments to the Arctic Ocean
5.4 Challenges
5.5 Outlook
Acronyms
Bibliography
Acknowledgements
Eidesstattliche Erklärung
Standort:
AWI Lesesaal
Zweigbibliothek:
AWI Bibliothek
