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Datasets of project "Periglacial Dynamics @ AWI"

Mostrando recursos 1 - 20 de 2.338

  1. Pollen and pediastrum record from the southern Taymyr peninsula, northern Siberia

    Niemeyer, Bastian; Herzschuh, Ulrike; Pestryakova, Ludmila A
    Siberian arctic vegetation and lake water communities, known for their temperature dependence, are expected to be particularly impacted by recent climate change and high warming rates. However, decadal information on the nature and strength of recent vegetation change and its time lag to climate signals are rare. In this study, we present a 210Pb/137Cs dated pollen and Pediastrum species record from a unnamed lake in the south of the Taymyr peninsula covering the period from AD 1706 to 2011. Thirty-nine palynomorphs and 10 morphotypes of Pediastrum species were studied to assess changes in vegetation and lake conditions as probable responses...

  2. Pollen and pediastrum record from the southern Taymyr peninsula, northern Siberia

    Niemeyer, Bastian; Herzschuh, Ulrike; Pestryakova, Ludmila A
    Siberian arctic vegetation and lake water communities, known for their temperature dependence, are expected to be particularly impacted by recent climate change and high warming rates. However, decadal information on the nature and strength of recent vegetation change and its time lag to climate signals are rare. In this study, we present a 210Pb/137Cs dated pollen and Pediastrum species record from a unnamed lake in the south of the Taymyr peninsula covering the period from AD 1706 to 2011. Thirty-nine palynomorphs and 10 morphotypes of Pediastrum species were studied to assess changes in vegetation and lake conditions as probable responses...

  3. (Figure 6) Pediastrum record of sediment core 11-CH-17A, Taymyr peninsula, northern Siberia

    Niemeyer, Bastian; Herzschuh, Ulrike; Pestryakova, Ludmila A

  4. (Figure 6) Pediastrum record of sediment core 11-CH-17A, Taymyr peninsula, northern Siberia

    Niemeyer, Bastian; Herzschuh, Ulrike; Pestryakova, Ludmila A

  5. (Figure 4) Pollen record of sediment core 11-CH-17A, Taymyr peninsula, northern Siberia

    Niemeyer, Bastian; Herzschuh, Ulrike; Pestryakova, Ludmila A

  6. (Figure 4) Pollen record of sediment core 11-CH-17A, Taymyr peninsula, northern Siberia

    Niemeyer, Bastian; Herzschuh, Ulrike; Pestryakova, Ludmila A

  7. Age determination, sedimentological, biogeochemical, and plant macrofossils analyses of outcrop PG2038-1

    Schleusner, Philipp; Biskaborn, Boris Kolumban; Kienast, Frank; Wolter, Juliane; Subetto, Dmitry A; Diekmann, Bernhard
    Thermokarst lakes are a widespread feature of the Arctic tundra, in which highly dynamic processes are closely connected with current and past climate changes. We investigated late Quaternary sediment dynamics, basin and shoreline evolution, and environmental interrelations of Lake El'gene-Kyuele in the NE Siberian Arctic (latitude 71°17'N, longitude 125°34'E). The water-body displays thaw-lake characteristics cutting into both Pleistocene Ice Complex and Holocene alas sediments. Our methods are based on grain size distribution, mineralogical composition, TOC/N ratio, stable carbon isotopes and the analysis of plant macrofossils from a 3.5-m sediment profile at the modern eastern lake shore. Our results show two...

  8. Age determination, sedimentological, biogeochemical, and plant macrofossils analyses of outcrop PG2038-1

    Schleusner, Philipp; Biskaborn, Boris Kolumban; Kienast, Frank; Wolter, Juliane; Subetto, Dmitry A; Diekmann, Bernhard
    Thermokarst lakes are a widespread feature of the Arctic tundra, in which highly dynamic processes are closely connected with current and past climate changes. We investigated late Quaternary sediment dynamics, basin and shoreline evolution, and environmental interrelations of Lake El'gene-Kyuele in the NE Siberian Arctic (latitude 71°17'N, longitude 125°34'E). The water-body displays thaw-lake characteristics cutting into both Pleistocene Ice Complex and Holocene alas sediments. Our methods are based on grain size distribution, mineralogical composition, TOC/N ratio, stable carbon isotopes and the analysis of plant macrofossils from a 3.5-m sediment profile at the modern eastern lake shore. Our results show two...

  9. (Table 2) Overview of identified plant macrofossils of outcrop PG2038-1

    Schleusner, Philipp; Biskaborn, Boris Kolumban; Kienast, Frank; Wolter, Juliane; Subetto, Dmitry A; Diekmann, Bernhard

  10. (Table 2) Overview of identified plant macrofossils of outcrop PG2038-1

    Schleusner, Philipp; Biskaborn, Boris Kolumban; Kienast, Frank; Wolter, Juliane; Subetto, Dmitry A; Diekmann, Bernhard

  11. (Figure 3) Sedimentological and biogeochemical analyses of outcrop PG2038-1

    Schleusner, Philipp; Biskaborn, Boris Kolumban; Kienast, Frank; Wolter, Juliane; Subetto, Dmitry A; Diekmann, Bernhard

  12. (Figure 3) Sedimentological and biogeochemical analyses of outcrop PG2038-1

    Schleusner, Philipp; Biskaborn, Boris Kolumban; Kienast, Frank; Wolter, Juliane; Subetto, Dmitry A; Diekmann, Bernhard

  13. (Table 1) Age determination of outcrop PG2038-1

    Schleusner, Philipp; Biskaborn, Boris Kolumban; Kienast, Frank; Wolter, Juliane; Subetto, Dmitry A; Diekmann, Bernhard

  14. (Table 1) Age determination of outcrop PG2038-1

    Schleusner, Philipp; Biskaborn, Boris Kolumban; Kienast, Frank; Wolter, Juliane; Subetto, Dmitry A; Diekmann, Bernhard

  15. Physico-chemical parameters of sediment core PG1972-1 (09-Tik-03) from a Tundra Lake, Northeastern Siberia

    Biskaborn, Boris Kolumban; Herzschuh, Ulrike; Bolshiyanov, Dimitry Yu; Savelieva, Larissa A; Zibulski, Romy; Diekmann, Bernhard
    Thermokarst lakes in the Siberian Arctic contain sediment archives that can be used for paleoenvironmental inference. Until now, however, there has been no study from the inner Lena River Delta with a focus on diatoms. The objective of this study was to investigate how the diatom community in a thermokarst lake responded to past limnogeological changes and what specific factors drove variations in the diatom assemblage. We analysed fossil diatom species, organic content, grain-size distribution and elemental composition in a sediment core retrieved in 2009 from a shallow thermokarst lake in the Arga Complex, western Lena River Delta. The core...

  16. Physico-chemical parameters of sediment core PG1972-1 (09-Tik-03) from a Tundra Lake, Northeastern Siberia

    Biskaborn, Boris Kolumban; Herzschuh, Ulrike; Bolshiyanov, Dimitry Yu; Savelieva, Larissa A; Zibulski, Romy; Diekmann, Bernhard
    Thermokarst lakes in the Siberian Arctic contain sediment archives that can be used for paleoenvironmental inference. Until now, however, there has been no study from the inner Lena River Delta with a focus on diatoms. The objective of this study was to investigate how the diatom community in a thermokarst lake responded to past limnogeological changes and what specific factors drove variations in the diatom assemblage. We analysed fossil diatom species, organic content, grain-size distribution and elemental composition in a sediment core retrieved in 2009 from a shallow thermokarst lake in the Arga Complex, western Lena River Delta. The core...

  17. Physico-chemical parameters of sediment core PG1975-1 (09-Tik-05) from a Tundra Lake, Northeastern Siberia

    Biskaborn, Boris Kolumban; Herzschuh, Ulrike; Bolshiyanov, Dimitry Yu; Schwamborn, Georg; Diekmann, Bernhard
    The relationships between thermokarst activity, limnogeological processes and climate change in the Siberian Arctic are not well understood. The objective of this paper is to identify the factors controlling the patterns of deposition, using grain size distribution, organic content, elemental composition and mineralogical composition of a 137-cm long sediment core with a maximum age of ~10.9 cal. kyr BP from Lake El'gene-Kyuele in the tundra of northeastern Siberia. Eight fine sand layers are attributed to depositional events associated with thaw slump activity acting upon orthogonally oriented patterns of ice-wedge networks in the ice-rich permafrost on the NW margin of the...

  18. Physico-chemical parameters of sediment core PG1975-1 (09-Tik-05) from a Tundra Lake, Northeastern Siberia

    Biskaborn, Boris Kolumban; Herzschuh, Ulrike; Bolshiyanov, Dimitry Yu; Schwamborn, Georg; Diekmann, Bernhard
    The relationships between thermokarst activity, limnogeological processes and climate change in the Siberian Arctic are not well understood. The objective of this paper is to identify the factors controlling the patterns of deposition, using grain size distribution, organic content, elemental composition and mineralogical composition of a 137-cm long sediment core with a maximum age of ~10.9 cal. kyr BP from Lake El'gene-Kyuele in the tundra of northeastern Siberia. Eight fine sand layers are attributed to depositional events associated with thaw slump activity acting upon orthogonally oriented patterns of ice-wedge networks in the ice-rich permafrost on the NW margin of the...

  19. Annual-layer thickness, d18O and sodium values on Akademii Nauk ice core (AD 900-1998) based on core chronology AN 2012

    Opel, Thomas; Fritzsche, Diedrich; Meyer, Hanno
    Understanding recent Arctic climate change requires detailed information on past changes, in particular on a regional scale. The extension of the depth-age relation of the Akademii Nauk (AN) ice core from Severnaya Zemlya (SZ) to the last 1100 yr provides new perspectives on past climate fluctuations in the Barents and Kara seas region. Here, we present the easternmost high-resolution ice-core climate proxy records (d18O and sodium) from the Arctic. Multi-annual AN d18O data as near-surface air-temperature proxies reveal major temperature changes over the last millennium, including the absolute minimum around 1800 and the unprecedented warming to a double-peak maximum in...

  20. Annual-layer thickness, d18O and sodium values on Akademii Nauk ice core (AD 900-1998) based on core chronology AN 2012

    Opel, Thomas; Fritzsche, Diedrich; Meyer, Hanno
    Understanding recent Arctic climate change requires detailed information on past changes, in particular on a regional scale. The extension of the depth-age relation of the Akademii Nauk (AN) ice core from Severnaya Zemlya (SZ) to the last 1100 yr provides new perspectives on past climate fluctuations in the Barents and Kara seas region. Here, we present the easternmost high-resolution ice-core climate proxy records (d18O and sodium) from the Arctic. Multi-annual AN d18O data as near-surface air-temperature proxies reveal major temperature changes over the last millennium, including the absolute minimum around 1800 and the unprecedented warming to a double-peak maximum in...

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