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  • 1
    Dissertations
    Dissertations
    Temporal and spatial dynamics of Arctic coastal changes and the resulting impacts: Yukon Territory, Canada (2017)
    Potsdam
    Details Availability
    Call number: AWI G3-19-92415
    Type of Medium: Dissertations
    Pages: VIII, 154, xv Seiten , Illustrationen, Diagramme, Karten
    URL: https://d-nb.info/1162860170/04
    Language: English
    Note: Table of contents Abstract Zusammenfassung 1 Motivation 2 Introduction 2.1 Arctic climate changes and their impacts on Coastal processes 2.2 Shoreline retreat along Arctic coasts 2.3 Impacts of Coastal erosion 2.3.1 Material fluxes 2.3.2 Retrogressive thaw slumps 2.3.3 Socio-economic impacts 2.4 Objectives 2.5 Study area 2.6 Thesis structure 2.7 Authors’ contributions 3 Variability in rates of Coastal change along the Yukon coast, 1951 to 2015 3.1 Introduction 3.2 Study Area 3.3 Data and Methods 3.3.1 Remote sensing data 3.3.2 Field survey data 3.3.3 Classification of shoreline 3.3.4 Transect-wise analyses of shoreline movements through time 3.4 Results 3.4.1 Temporal variations in shoreline change rates 3.4.2 Alongshore rates of change 3.4.3 Shoreline dynamics along field sites 3.4.4 Dynamics of lagoons, barrier Islands and spits (gravel features) 3.4.5 Yukon Territory land loss 3.5 Discussion 3.5.1 Temporal variations in shoreline change rates 3.5.2 Alongshore rates of change 3.5.3 Dynamics of lagoons, barrier Islands, and spits (gravel features) 3.5.4 Expected shoreline changes as a consequence of future climate warming 3.6 Conclusions Context 4 Coastal erosion of permafrost Solls along the Yukon Coastal Plain and Kuxes oforganic carbon to the Canadian Beaufort Sea 4.1 Introduction 4.2 Study Area 4.3 Methods 4.3.1 Sample collection and laboratory analyses 4.3.2 Soll organic carbon determinations 4.3.3 Flux of organic soil carbon and Sediments 4.3.4 Fate of the eroded soil organic carbon 4.4 Results 4.4.1 Ground lce 4.4.2 Organic carbon contents 4.4.3 Material fluxes 4.5 Discussion 4.5.1 Ground lce 4.5.2 Organic carbon contents 4.5.3 Material fluxes 4.5.4 Organic carbon in nearshore Sediments 4.6 Conclusion Context 5 Terrain Controls on the occurrence of Coastal retrogressive thaw slumpsalong the Yukon Coast, Canada 5.1 Introduction 5.2 Study Area 5.3 Methods 5.3.1 Mapping of RTSs and landform Classification 5.3.2 Environmental variables 5.3.3 Univariate regression trees 5.4 Results 5.4.1 Characteristics of RTS along the coast 5.4.2 Density and areal coverage od RTSs along the Yukon Coast 5.5 Discussion 5.5.1 Characteristics and distribution of RTSs along the Yukon Coast 5.5.2 Terrain factors explaining RTS occurrence 5.5.3 Coastal processes 5.6 Conclusions Context 6 Impacts of past and fiiture Coastal changes on the Yukon coast - threats forcultural sites, infrastructure and travel routes 6.1 Introduction 6.2 Study Area 6.3 Methods 6.3.1 Data for shoreline projections 6.3.2 Shoreline projection for the conservative scenario (S1) 6.3.3 Shoreline Projection for the dynamic scenario (S2) 6.3.4 Positioning and characterizing of cultural sites 6.3.5 Calculation of losses under the S1 and S2 scenarios 6.3.6 Estimation of future dynamics in very dynamic areas 6.4 Results and discussion 6.4.1 Past and future shoreline change rates 6.4.2 Cultural sites 6.4.3 Infrastructure and travel routes 6.5 Conclusions 7 Discussion 7.1 The importance of understanding climatic drivers of Coastal changes 7.2 The influence of shoreline change rates on retrogressive thaw slump activity 7.3 On the calculation of carbon fluxes from Coastal erosion along the Yukon coast 7.4 Impacts of present and future Coastal erosion on the natural and human environment 7.5 Synthesis 8 Summary and Conclusions Bibliography Supporting Material Data Set ds01 Table S1 Table S3 Abbreviations and Nomendature Acknowledgements
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 2
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    Marine Sediment data along the Yukon Coastal Plain, Canada (2019)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Description: Narrowing uncertainties about carbon cycling is important in the Arctic where rapid environmental changes contribute to enhanced mobilization of carbon. Here we quantify soil organic carbon (SOC) contents of permafrost soils along the Yukon Coastal Plain and determine the annual fluxes from erosion. Different terrain units are assessed based on surficial geology, morphology, and ground ice conditions. To account for the volume of wedge ice and massive ice in a unit, sample SOC contents are reduced by 19% and sediment contents by 16%. The SOC content in a 1 m**2 column of soil varies according to the height of the bluff, ranging from 30 to 662 kg, with a mean value of 183 kg. Forty-four per cent of the SOC is within the top 1 m of soil and values vary based on surficial materials, ranging from 30 to 53 kg C/m**3, with a mean of 41 kg. Eighty per cent of the shoreline is erosive with a mean annual rate of change is 0.7 m/a. This results in a SOC flux per meter of shoreline of 131 kg C/m/a, and a total flux for the entire Yukon coast of 35.5 10**6 kg C/a (0.036 Tg C/a). The mean flux of sediment per meter of shoreline is 5.3 10**3 kg/m/a, with a total flux of 1,832.0 10**6 kg/a (1.832 Tg/a). Sedimentation rates indicate that approximately 13% of the eroded carbon is sequestered in nearshore sediments, where the overwhelming majority of organic carbon is of terrestrial origin.
    Keywords: Box corer/grab; Carbon, organic, terrestrial matter; Carbon, organic, total; Carbon/Nitrogen ratio; DEPTH, water; Distance; Event label; Herschel_North_HN-1; Herschel_North_HN-3; Herschel_North_HN-5; Herschel_West_HW-1; King_Point-3; King_Point-4; Latitude of event; Longitude of event; Nitrogen, total; Nunaluk_Inside_NI-2; Nunaluk_Inside_NI-4; Nunaluk_Inside_NI-5; Push_Ridge-1; Push_Ridge-5; Sample ID; Shingle_Point-1; Shingle_Point-3; Shingle_Point-5; Site; Stokes-3; Thetis_Bay_TB-1; Thetis_Bay_TB-5; Whale_Bay_WB-5; Workboat_North_WN-3; Workboat_North_WN-5; Workboat_South_WS-3; Workboat_South_WS-5; Yukon, Canada, North America; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 176 data points
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  • 3
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    Quantification of shoreline movements along the Yukon Territory mainland coast between 1951 and 2011 (2017)
    PANGAEA
    In:  Supplement to: Irrgang, Anna Maria; Lantuit, Hugues; Manson, Gavin K; Günther, Frank; Grosse, Guido; Overduin, Pier Paul (2018): Variability in rates of coastal change along the Yukon Coast, 1951 to 2015. Journal of Geophysical Research-Earth Surface, 123(4), 779-800, https://doi.org/10.1002/2017JF004326
    Details
    Publication Date: 2023-01-13
    Description: The Arctic is warming, but the impacts on its coasts are not well documented. To better understand the reaction of Arctic coasts to increasing environmental pressure, shoreline position changes along a 210 km length of the Yukon Territory mainland coast in north-west Canada were investigated for the time period from 1951 to 2011. Shoreline positions were extracted from georeferenced aerial photographs from 1951, 1953, 1954, 1972, 1976, 1992, 1994, and 1996, and from WorldView and GeoEye satellite imagery from 2011. Shoreline change was then analyzed using the Digital Shoreline Analysis System (DSAS) extension for ESRI ArcGIS. Shoreline change rates decelerated to a mean rate of -0.5 m/a between the 1970s to 1990s, which was followed by a significant increase in coastal erosion to -1.3 m/a in the 1990s to 2011 time period. These observation indicate that the current rate of coastal retreat along the Yukon coast is higher than at any time before in the 60 year long observation record.
    Keywords: ACD; Arctic Coastal Dynamics; Classification; Digital Shoreline Analysis System extension for ESRI ArcGIS, Thieler et al, 2009; Digitized shoreline indicator; LATITUDE; LONGITUDE; Net shoreline movement; Rates of positional changes; SAT; Satellite derived; Satellite remote sensing; Transect; UTM Easting, Universal Transverse Mercator; UTM Northing, Universal Transverse Mercator; UTM Zone, Universal Transverse Mercator; Yukon_Territory_mainland_coast; Yukon, Canada, North America
    Type: Dataset
    Format: text/tab-separated-values, 43963 data points
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  • 4
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    Current velocity measurements from upward-looking ADCP at Qikiqtaruk during the Yukon Coast 2018 expedition of the AWI (2021)
    PANGAEA
    In:  Alfred Wegener Institute - Research Unit Potsdam
    Details
    Publication Date: 2024-01-08
    Description: The dataset compiles water current velocities and direction measured by a platform-based upward looking Acoustic Doppler Current Profiler. Data was acquired in August 2018 during the Yukon Coast 2018 expedition to the Herschel Island – Qikiqtaruk coastal observatory, conducted by the Alfred Wegener Institute in Potsdam, Germany. Goal of this project was to find drivers that control nearshore currents and to map their spatio-temporal variation. These currents might play an important role in the transport process of sediments and organic matter in the nearshore zone of the Arctic Ocean. The sediments mainly originate from the rapidly eroding permafrost coasts. The columns of this data file include Date/Time, height above the seafloor of the respective measurement cell (bin), current velocity in east-west direction and current velocity in north-south direction.
    Keywords: Acoustic Current Doppler Profiler; Acoustic Doppler Current Profiling (ADCP); Acoustic Doppler Current Profiling (ADCP), RDI Workhorse Sentinel, 600 kHz; ADCP; ADCP data; Arctic Ocean; Arctic Shelf; AWI_Perma; AWI Arctic Land Expedition; Beaufort Sea; CA-Land_2018_YukonCoast; Coastal erosion; Current Direction; currents; current velocity; Current velocity, east-west; Current velocity, north-south; Date/Time local; Height above sea floor/altitude; Herschel Island; hydrodynamics; Nearshore zone; NUNATARYUK; NUNATARYUK, Permafrost thaw and the changing Arctic coast, science for socioeconomic adaptation; Permafrost; Permafrost Research; Qikiqtaruk; YC_2018_ADCP; Yukon_Coast_2018; Yukon Coast
    Type: Dataset
    Format: text/tab-separated-values, 923306 data points
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  • 5
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    Current velocity measurements from upward-looking ADCP at Qikiqtaruk during the Yukon Coast 2015 expedition of the AWI (2021)
    PANGAEA
    In:  Alfred Wegener Institute - Research Unit Potsdam
    Details
    Publication Date: 2024-01-08
    Description: The dataset compiles water current velocities and direction measured by a platform-based upward looking Acoustic Doppler Current Profiler. Data was acquired in July/August 2015 during the Yukon Coast 2015 expedition to the Herschel Island – Qikiqtaruk coastal observatory, conducted by the Alfred Wegener Institute in Potsdam, Germany. Goal of this project was to find drivers that control nearshore currents and to map their spatio-temporal variation. These currents might play an important role in the transport process of sediments and organic matter in the nearshore zone of the Arctic Ocean. The sediments mainly originate from the rapidly eroding permafrost coasts. The columns of this data file include Date/Time, height above the seafloor of the respective measurement cell (bin), current velocity in east-west direction and current velocity in north-south direction.
    Keywords: Acoustic Current Doppler Profiler; Acoustic Doppler Current Profiling (ADCP); Acoustic Doppler Current Profiling (ADCP), RDI Workhorse Sentinel, 600 kHz; ADCP; ADCP data; Arctic Ocean; Arctic Shelf; AWI_Perma; AWI Arctic Land Expedition; Beaufort Sea; CA-Land_2015_YukonCoast; Coastal erosion; currents; current velocity; Current velocity, east-west; Current velocity, north-south; Date/Time local; Height above sea floor/altitude; Herschel Island; hydrodynamics; Nearshore zone; Permafrost; Permafrost Research; Qikiqtaruk; YC_2015_ADCP; Yukon_Coast_2015; Yukon Coast
    Type: Dataset
    Format: text/tab-separated-values, 150784 data points
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  • 6
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    Sedimentological and biogeochemical data on samples from undisturbed, disturbed and marine sediments from Qikiqtaruk (Herschel Island, Yukon Coast, Canada) taken in summer 2014 (2017)
    PANGAEA
    In:  Alfred Wegener Institute - Research Unit Potsdam
    Details
    Publication Date: 2024-03-22
    Keywords: Active layer depth; Ammonium; AWI_PerDyn; Carbon, organic, dissolved; Carbon, organic, dissolved/Nitrogen, total, dissolved ratio; Carbon, organic, total; Carbon, organic, total/Nitrogen, total ratio; Comment; DATE/TIME; Density, dry bulk; DEPTH, sediment/rock; Herschel Island, Yukon Territory, Canada; Ice content; LATITUDE; LONGITUDE; MULT; Multiple investigations; Nitrate; Nitrite; Nitrogen, inorganic, dissolved; Nitrogen, total; Nitrogen, total dissolved; Permafrost Research (Periglacial Dynamics) @ AWI; Qikiqtaruk; Sample ID; Sample mass; Sample volume; Subzone; Zone; δ13C, dissolved organic carbon; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 2514 data points
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  • 7
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    Soil organic carbon (SOC) and sediment contents and fluxes for terrain units along the Yukon Coastal Plain, Canada, including corrections for volumetric ground ice contents (2018)
    PANGAEA
    In:  Supplement to: Couture, Nicole; Irrgang, Anna Maria; Pollard, Wayne H; Lantuit, Hugues; Fritz, Michael (2018): Coastal Erosion of Permafrost Soils Along the Yukon Coastal Plain and Fluxes of Organic Carbon to the Canadian Beaufort Sea. Journal of Geophysical Research: Biogeosciences, https://doi.org/10.1002/2017JG004166
    Details
    Publication Date: 2024-05-07
    Description: Narrowing uncertainties about carbon cycling is important in the Arctic where rapid environmental changes contribute to enhanced mobilization of carbon. Here we quantify soil organic carbon (SOC) contents of permafrost soils along the Yukon Coastal Plain and determine the annual fluxes from erosion. Different terrain units are assessed based on surficial geology, morphology, and ground ice conditions. To account for the volume of wedge ice and massive ice in a unit, sample SOC contents are reduced by 19% and sediment contents by 16%. The SOC content in a 1 m**2 column of soil varies according to the height of the bluff, ranging from 30 to 662 kg, with a mean value of 183 kg. Forty-four per cent of the SOC is within the top 1 m of soil and values vary based on surficial materials, ranging from 30 to 53 kg C/m**3, with a mean of 41 kg. Eighty per cent of the shoreline is erosive with a mean annual rate of change is 0.7 m/a. This results in a SOC flux per meter of shoreline of 131 kg C/m/a, and a total flux for the entire Yukon coast of 35.5 10**6 kg C/a (0.036 Tg C/a). The mean flux of sediment per meter of shoreline is 5.3 10**3 kg/m/a, with a total flux of 1,832.0 10**6 kg/a (1.832 Tg/a). Sedimentation rates indicate that approximately 13% of the eroded carbon is sequestered in nearshore sediments, where the overwhelming majority of organic carbon is of terrestrial origin.
    Keywords: Area, eroded; Carbon, organic, total; Carbon and nitrogen and sulfur (CNS) isotope element analyzer, Elementar, Vario EL III; Change rate; Corrected; Density, dry bulk; Density, mass density; Depth, soil, maximum; Depth, soil, minimum; Ice content; LATITUDE; Layer thickness; Lithology/composition/facies; Location; LONGITUDE; Mass, flux; Mass per unit area; Reference/source; Sample ID; Yukon_Coastal_Soils; Yukon, Canada, North America
    Type: Dataset
    Format: text/tab-separated-values, 12409 data points
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  • 8
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    Coastal Erosion of Permafrost Soils Along the Yukon Coastal Plain and Fluxes of Organic Carbon to the Canadian Beaufort Sea (2018)
    American Geophysical Union
    Details
    Publication Date: 2018-02-01
    Print ISSN: 2169-8953
    Electronic ISSN: 2169-8961
    Topics: Geosciences , Biology
    Published by American Geophysical Union
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  • 9
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    Variability in Rates of Coastal Change Along the Yukon Coast, 1951 to 2015 (2018)
    American Geophysical Union
    Details
    Publication Date: 2018-04-01
    Print ISSN: 2169-9003
    Electronic ISSN: 2169-9011
    Topics: Geosciences , Physics
    Published by American Geophysical Union
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  • 10
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    Contribution of Coastal Retrogressive Thaw Slumps to the Nearshore Organic Carbon budget along the Yukon Coast (2017)
    Copernicus
    Details
    Publication Date: 2017-10-26
    Description: We describe the evolution of coastal retrogressive thaw slumps (RTSs) between 1952 and 2011 along the Yukon Coast, Canada, and provide the first estimate of the contribution of RTSs to the nearshore organic carbon budget in this area. We 1) monitor the evolution of RTSs during the periods 1952–1972 and 1972–2011; 2) calculate the volume of material eroded and stocks of organic carbon (OC) mobilized through slumping – including soil organic carbon (SOC) and dissolved organic carbon (DOC) – and 3) measure the OC fluxes mobilized through slumping between 1972 and 2011. We identified 15 RTSs using high-resolution satellite imagery from 2011 and geocoded aerial photographs from 1952 and 1972. To estimate the volume of eroded material, we applied a spline interpolation on an airborne LiDAR dataset acquired in July 2013. We inferred the stocks of mobilized SOC and DOC from existing related literature. Our results show a 73 % increase in the number of RTSs between 1952 and 2011. In the study area, RTSs displaced at least 8600 × 103 m3 of material, with 53 % of ice. We estimated that slumping mobilized 81 900 × 103 kg of SOC and 156 × 103 kg of DOC. Since 1972, 17 % of the RTSs 20 have displaced 8.6 × 103 m3/yr of material, with an average OC flux of 82.5 ×103 kg/yr. This flux represents 0.3 % of the OC flux released from coastal retreat; however RTSs have a strong impact on the transformation of OC in the coastal fringe.
    Print ISSN: 1810-6277
    Electronic ISSN: 1810-6285
    Topics: Biology , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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