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Datasets of project "GeoForschungszentrum Potsdam"

Mostrando recursos 1 - 20 de 27

  1. Lake Son Kol geochemistry, µXRF, biogeochemistry and pollen record

    Lauterbach, Stefan; Witt, Roman; Plessen, Birgit; Dulski, Peter; Prasad, Sushma; Mingram, Jens; Gleixner, Gerd; Hettler-Riedel, Sabine; Stebich, Martina; Schnetger, Bernhard; Schwalb, Antje; Schwarz, Anja
    In general, a moderate drying trend is observed in mid-latitude arid Central Asia since the Mid-Holocene, attributed to the progressively weakening influence of the mid-latitude Westerlies on regional climate. However, as the spatio-temporal pattern of this development and the underlying climatic mechanisms are yet not fully understood, new high-resolution paleoclimate records from this region are needed. Within this study, a sediment core from Lake Son Kol (Central Kyrgyzstan) was investigated using sedimentological, (bio)geochemical, isotopic, and palynological analyses, aiming at reconstructing regional climate development during the last 6000 years. Biogeochemical data, mainly reflecting summer moisture conditions, indicate predominantly wet conditions until...

  2. (Table 1) Age determination of sediment core SONK_11_D

    Lauterbach, Stefan; Witt, Roman; Plessen, Birgit; Dulski, Peter; Prasad, Sushma; Mingram, Jens; Gleixner, Gerd; Hettler-Riedel, Sabine; Stebich, Martina; Schnetger, Bernhard; Schwalb, Antje; Schwarz, Anja

  3. Ti and K content in sediment core SONK_11_D

    Lauterbach, Stefan; Witt, Roman; Plessen, Birgit; Dulski, Peter; Prasad, Sushma; Mingram, Jens; Gleixner, Gerd; Hettler-Riedel, Sabine; Stebich, Martina; Schnetger, Bernhard; Schwalb, Antje; Schwarz, Anja

  4. Pollen record of sediment core SONK_11_D

    Lauterbach, Stefan; Witt, Roman; Plessen, Birgit; Dulski, Peter; Prasad, Sushma; Mingram, Jens; Gleixner, Gerd; Hettler-Riedel, Sabine; Stebich, Martina; Schnetger, Bernhard; Schwalb, Antje; Schwarz, Anja

  5. Geochemistry of sediment core SONK_11_D

    Lauterbach, Stefan; Witt, Roman; Plessen, Birgit; Dulski, Peter; Prasad, Sushma; Mingram, Jens; Gleixner, Gerd; Hettler-Riedel, Sabine; Stebich, Martina; Schnetger, Bernhard; Schwalb, Antje; Schwarz, Anja

  6. Biogeochemistry of sediment core SONK_11_D

    Lauterbach, Stefan; Witt, Roman; Plessen, Birgit; Dulski, Peter; Prasad, Sushma; Mingram, Jens; Gleixner, Gerd; Hettler-Riedel, Sabine; Stebich, Martina; Schnetger, Bernhard; Schwalb, Antje; Schwarz, Anja

  7. Mid-to Late Holocene flood frequency in the northeastern Alps as recorded in varved sediments of Lake Mondsee

    Swierczynski, Tina; Lauterbach, Stefan; Dulski, Peter; Delgado, José M; Merz, Bruno; Brauer, Achim
    Annually laminated (varved) lake sediments with intercalated detrital layers resulting from sedimentary input by runoff events are ideal archives to establish precisely dated records of past extreme runoff events. In this study, the mid- to late Holocene varved sediments of Lake Mondsee (Upper Austria) were analysed by combining sedimentological, geophysical and geochemical methods. This approach allows to distinguish two types of detrital layers related to different types of extreme runoff events (floods and debris flows) and to detect changes in flood activity during the last 7100 years. In total, 271 flood and 47 debris flow layers, deposited during spring and...

  8. Geochemistry of sediment core Mo05 Lake Mondsee

    Swierczynski, Tina; Lauterbach, Stefan; Dulski, Peter; Delgado, José M; Merz, Bruno; Brauer, Achim

  9. Layer thickness of sediment core Mo05 Lake Mondsee

    Swierczynski, Tina; Lauterbach, Stefan; Dulski, Peter; Delgado, José M; Merz, Bruno; Brauer, Achim

  10. (Table 1) GRACE-derived mass balance of the Greenland ice sheet 2002-2010

    Bergmann, Inga; Ramillien, Guillaume; Frappart, Frédéric
    We re-evaluate the Greenland mass balance for the recent period using low-pass Independent Component Analysis (ICA) post-processing of the Level-2 GRACE data (2002-2010) from different official providers (UTCSR, JPL, GFZ) and confirm the present important ice mass loss in the range of -70 and -90 Gt/y of this ice sheet, due to negative contributions of the glaciers on the east coast. We highlight the high interannual variability of mass variations of the Greenland Ice Sheet (GrIS), especially the recent deceleration of ice loss in 2009-2010, once seasonal cycles are robustly removed by Seasonal Trend Loess (STL) decomposition. Interannual variability leads...

  11. Paleointensities of sediment core PG1111, Lama Lake, northern Central Siberia

    Nowaczyk, Norbert R; Harwart, Stefanie K; Melles, Martin
    High-resolution analyses of rock magnetic and sedimentological parameters were conducted on an 11 m long sediment core from Lama Lake, Northern Siberia, which encompasses the late Pleistocene and the Holocene epochs. The results reveal a strong link between the median grain size of the magnetic particles, identified as magnetite, and the oxidation state of the sediment. Reducing conditions associated with a relative high total organic carbon (TOC) content of the sediment characterize the upper 7 m of the core (~ Holocene), and these have led to a partial dissolution of detrital magnetite grains, and a homogenization of grain-size-related rock magnetic...

  12. Rock magnetic record from Lama Lake

    Nowaczyk, Norbert R; Harwart, Stefanie K; Melles, Martin
    An 11 m long sediment core ftorn Lama Lake, Northern Siberia, has been subjected to intense sedimentological, geochemical and rock magnetic analyses. According to a palynologic investigation the recovered sediments cover the whole Holocene and the late Pleistocene reaching back to about 17 ka. IRM acquisition experiments, hysteresis loop and back field as well as thermomagnetic measurements revealed magnetite in the pseudo-single domain range as the only remanence carrier. Sharp rock magnetic boundaries occur at 20 and 745 cm sub-bottom depth that are clearly linked to shifts in the median grain size of the magnetite. These boundaries are close to...

  13. Age, event layer thickness and titanium µXRF counts of sediment core Mo05 obtained from Lake Mondsee, Austria

    Swierczynski, Tina; Brauer, Achim; Lauterbach, Stefan; Martín-Puertas, Celia; Dulski, Peter; von Grafenstein, Ulrich; Rohr, Christian
    We present a record of extreme spring-summer runoff events for the past 1600 yr preserved in the varved sediments of Lake Mondsee (Austrian Pre-Alps). Combined sediment microfacies analyses and high-resolution micro-X-ray fluorescence element scanning allow us to identify 157 detrital event layers deposited in spring-summer and to discriminate between regional flood and local debris flow deposits. Higher spring-summer flood activity with a mean event recurrence of 3-5 yr occurred in several well-confined multidecadal episodes during the Dark Ages Cold Period and Medieval time (A.D. 450-480, 590-640, 700-750, and 1140-1170) as well as during the early Little Ice Age (LIA; A.D....

  14. Age and thickness of event layers in composite sediment core Mo05 obtained from Lake Mondsee

    Swierczynski, Tina; Brauer, Achim; Lauterbach, Stefan; Martín-Puertas, Celia; Dulski, Peter; von Grafenstein, Ulrich; Rohr, Christian

  15. Age and titanium µXRF counts in composite sediment core Mo05 obtained from Lake Mondsee

    Swierczynski, Tina; Brauer, Achim; Lauterbach, Stefan; Martín-Puertas, Celia; Dulski, Peter; von Grafenstein, Ulrich; Rohr, Christian

  16. Rock magnetic parameters of sediment core PS55/100-2

    Yancheva, Gergana; Nowaczyk, Norbert R

  17. Rock magnetic parameters of sediment core PS55/093-1

    Yancheva, Gergana; Nowaczyk, Norbert R

  18. Rock magnetic parameters of sediment core PS55/077-5

    Yancheva, Gergana; Nowaczyk, Norbert R

  19. High resolution measurements of bulk susceptibility on sediment core PS55/100-2

    Yancheva, Gergana; Nowaczyk, Norbert R

  20. High resolution measurements of bulk susceptibility on sediment core PS55/093-1

    Yancheva, Gergana; Nowaczyk, Norbert R

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