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  • 1
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    Fluvial and permafrost history of the lower Lena River, north‐eastern Siberia, over late Quaternary time (2022)
    Schwamborn, Georg ; Schirrmeister, Lutz ; Mohammadi, Ali ; [et al.]
    Details
    Publication Date: 2023-11-18
    Description: Arctic warming and permafrost thaw visibly expose changes in the landscape of the Lena River delta, the largest Arctic delta. Determining the past and modern river regime of thick deltaic deposits shaping the Lena River mouth in north‐eastern Siberia is critical for understanding the history of delta formation and carbon sequestration. Using a 65 m long sediment core from the delta apex a set of sedimentological techniques is applied to aid in reconstructing the Lena River history. The analysis includes: (i) grain‐size measurements and the determination of the bedload composition; (ii) X‐ray fluorescence, X‐ray diffractometry, and magnetic susceptibility measurements and heavy mineral analysis for tracking mineral change; (iii) pH, electrical conductivity, ionic concentrations, and the δ〈sub〉18〈/sub〉O and δD stable isotope composition from ground ice for reconstructing permafrost formation. In addition; (iv) total and dissolved organic carbon is assessed. Chronology is based on; (vi) radiocarbon dating of organic material (accelerator mass spectrometry and conventional) and is complemented by two infrared – optically stimulated luminescence dates. The record stretches back approximately to Marine Isotope Stage 7. It holds periods from traction, over saltation, to suspension load sedimentation. Minerogenic signals do not indicate provenance change over time. They rather reflect the change from high energy to a lower energy regime after Last Glacial Maximum time parallel to the fining‐up grain‐size trend. A prominent minimum in the ground ice stable isotope record at early Holocene highlights that a river arm migration and an associated refreeze of the underlying river talik has altered the isotopic composition at that time. Fluvial re‐routing might be explained by internal dynamics in the Lena River lowland or due to a tectonic movement, since the study area is placed in a zone of seismic activity. At the southern Laptev Sea margin, onshore continental compressional patterns are bordering offshore extensional normal faults.
    Description: Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research
    Description: https://doi.org/10.1594/PANGAEA.945355
    Keywords: ddc:551 ; Lena River ; north‐eastern Siberia ; palaeoenvironment ; permafrost ; Quaternary
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 2
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    Assessment of the Ice Wedge Polygon Current State by Means of UAV Imagery Analysis (Samoylov Island, the Lena Delta) (2019)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2019-07-09
    Description: Modern degradation of Arctic permafrost promotes changes in tundra landscapes and leads to degradation of ice wedge polygons, which are the most widespread landforms of Arctic wetlands. Status assessment of polygon degradation is important for various environmental studies. We have applied the geographic information systems’ (GIS) analysis of data from unmanned aerial vehicles (UAV) to accurately assess the status of ice wedge polygon degradation on Samoylov Island. We used several modern models of polygon degradation for revealing polygon types, which obviously correspond to different stages of degradation. Manual methods of mapping and a high spatial resolution of used UAV data allowed for a high degree of accuracy in the identification of all land units. The study revealed the following: 41.79% of the first terrace surface was composed of non-degraded polygonal tundra; 18.37% was composed of polygons, which had signs of thermokarst activity and corresponded to various stages of degradation in the models; and 39.84% was composed of collapsed polygons, slopes, valleys, and water bodies, excluding ponds of individual polygons. This study characterizes the current status of polygonal tundra degradation of the first terrace surface on Samoylov Island. Our assessment reflects the landscape condition of the first terrace surface of Samoylov Island, which is the typical island of the southern part of the Lena Delta. Moreover, the study illustrates the potential of UAV data GIS analysis for highly accurate investigations of Arctic landscape changes.
    Electronic ISSN: 2072-4292
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Molecular Diversity Preservation International
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    PAPER CURRENT
  • 3
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    SAM18-01 Samoylov permafrost drilling, Lena Delta, NE Siberia (2022)
    PANGAEA
    Details
    Publication Date: 2023-11-16
    Description: Using a new 65 m long sediment core from the Lena delta apex (Samoylov Island), NE Siberia, this project uses a range of sediment and ground ice properties to help reconstructing the history of the lower Lena River. The analysis includes ( i ) 14C-AMS radiocarbon dating from organic detritus, (ii) grain size composition, (iii) magnetic susceptibility, (iv) XRD (x-ray diffractometry) measurements from the fraction 〈2 mm, (v) XRF (x-ray fluorescence) measurements from the fraction 〈2 mm, (vi) TOC (total organic carbon) from bulk sediment, (vii) d13Corg from bulk sediment, (viii) TN (total nitrogen) from bulk sediment, (ix) heavy mineral composition from the fraction 63-125 µm), ( x ) pH from ground ice, (xi) electrical conductivity from ground ice, (xii) the stable water isotope composition (d18O and dD) from ground ice, (xiii) sulfate and chlorine from ground ice, (xiv) DOC (dissolved organic carbon) from ground ice.
    Keywords: 14C age; Age, comment; Aluminium; Amphibole; Andalusite; Apatite; Arsenic; AWI_Envi; AWI_Perma; AWI Arctic Land Expedition; Barium; Biotite; Bromine; Bulk sediment material; Calcium; Calcium/Titanium ratio; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Calendar age, standard error; Carbon, organic, dissolved; Carbon, organic, total; Carbon, organic, total/Nitrogen, total ratio; Chloride; Chlorine; Chloritoid; Clay minerals/feldspar+quartz ratio; Conductivity, electrolytic; core images; Counting 63-125 µm fraction; DEPTH, sediment/rock; Deuterium excess; Disthene; DRILL; Drilling/drill rig; Epidote; Garnet; Ground ice; Heavy mineral grains; Heavy minerals/clay minerals ratio; Ice content, gravimetric; Illite; Iron; Kalifeldspar/Plagioclase ratio; Kaolinite+Chlorite; Lead; Lena 2018; Lena Delta; Magnetic susceptibility; Minerals, other; Monazite; Muscovite; Permafrost; Permafrost Research; pH; Polar Terrestrial Environmental Systems @ AWI; Potassium; Potassium/Titanium ratio; Pyroxene; Quartz/Feldspar ratio; Rubidium; Rubidium/Zirconium ratio; RU-Land_2018_Lena; Rutile; SAM18-01; sediment analysis; Silicon; Sillimanite; Size fraction 〈 0.2 µm, fine clay; Size fraction 0.004-0.002 mm, 8.0-9.0 phi, very fine silt; Size fraction 0.008-0.004 mm, 7.0-8.0 phi, fine silt; Size fraction 0.016-0.008 mm, 6.0-7.0 phi, medium silt; Size fraction 0.032-0.016 mm, 5.0-6.0 phi, coarse silt; Size fraction 0.063-0.032 mm, 4.0-5.0 phi, very coarse silt; Size fraction 0.125-0.063 mm, 3.0-4.0 phi, very fine sand; Size fraction 0.250-0.125 mm, 2.0-3.0 phi, fine sand; Size fraction 0.500-0.250 mm, 1.0-2.0 phi, medium sand; Size fraction 1.000-0.500 mm, 0.0-1.0 phi, coarse sand; Size fraction 16-8 mm, medium gravel; Size fraction 2.000-1.000 mm, (-1.0)-0.0 phi, very coarse sand; Size fraction 4.0-2.0 mm, very fine gravel, granule; Size fraction 8.0-4.0 mm, fine gravel; Smectite; Sphene; stable hydrogen isotopes; stable oxygen isotopes; Staurolite; Strontium; Strontium/Iron ratio; Sulfate; Sulfur; Titanium; Tourmaline; X-ray diffraction, 〈2 mm fraction; X-ray fluorescence, 〈 2 mm fraction; Zinc; Zircon; Zirconium; δ13C, organic carbon; δ18O, water; δ Deuterium, water
    Type: Dataset
    Format: text/tab-separated-values, 3733 data points
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    DATA PANGAEA
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