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Kasper, Thomas; Frenzel, Peter; Haberzettl, Torsten; Schwarz, Anja; Daut, Gerhard; Meschner, Stephanie; Wang, Junbo; Zhu, Liping; Mäusbacher, Roland (2013): Investigations on sediments from Lake Nam Co (Tibetan Plateau) [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.833128, Supplement to: Kasper, T et al. (2013): Interplay between redox conditions and hydrological changes in sediments from Lake Nam Co (Tibetan Plateau) during the past 4000 cal BP inferred from geochemical and micropaleontological analyses. Palaeogeography, Palaeoclimatology, Palaeoecology, 392, 261-271, https://doi.org/10.1016/j.palaeo.2013.09.027

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Abstract:
This study focuses on the analysis of lake sediments retrieved from the deepest part of Lake Nam Co (Tibetan Plateau). One gravity core of 115 cm length, covering the last ~ 4000 cal BP, was analyzed for geochemical and biological parameters. High organic content at ~ 4000 cal BP and the coinciding presence of pyrite framboids until ~ 2000 cal BP point to hampered decomposition of organic material due to anoxic conditions within the lake sediments. At the same time sedimentological and biological proxies suggest a rather high lake level, but still ~ 5 m below the recent one, with less saline lake water due to enhanced monsoonal activity. During this time a change in the source of organic matter to lowered input of terrestrial components is observed. A rather quick shift to a dry environment with less monsoonal influence and a lake level ~ 15 m lower than today at ~ 2000 cal BP lead to the oxygenation of sediment, the degradation of organic matter and the absence of pyrite. Oscillations of the lake level thereafter were of minor amplitude and not able to establish anoxia at the lake bottom again. A wet spell between ~ 1500 cal BP and ~ 1150 cal BP is visible in proxies referring to catchment hydrology and the ostracod-based water depth transfer function gives only a slightly elevated lake level. The last ~ 300 years are characterized by low TOC and rising TN values reflecting enhanced nutrient supply and hence an advancing influence of human activity in the catchment. Decreasing TOC/TN values point to a complete shift to almost solely aquatic biomass production. These results show that hydrological variations in terms of lake level change based on monsoonal strength can be linked to redox conditions at the lake bottom of Nam Co. Comparison with other archives over larger parts of the Tibetan Plateau and beyond exhibits a rather homogeneous climatic pattern throughout the late Holocene.
Coverage:
Median Latitude: 30.742569 * Median Longitude: 90.805812 * South-bound Latitude: 30.737420 * West-bound Longitude: 90.790330 * North-bound Latitude: 30.829850 * East-bound Longitude: 91.064370
Date/Time Start: 2008-09-15T00:00:00 * Date/Time End: 2013-05-30T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
9 datasets

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Datasets listed in this publication series

  1. Kasper, T; Frenzel, P; Haberzettl, T et al. (2013): (Fig. 5) Diatom associations in sediment core NC_08/01_P4. https://doi.org/10.1594/PANGAEA.833124
  2. Kasper, T; Frenzel, P; Haberzettl, T et al. (2013): (Fig. 6) Median grain size in sediment core NC_08/01_P4. https://doi.org/10.1594/PANGAEA.833125
  3. Kasper, T; Frenzel, P; Haberzettl, T et al. (2013): (Fig. 6) Occurrence of monohydrocalcite (MHC) in sediment core NC_08/01_P4. https://doi.org/10.1594/PANGAEA.833126
  4. Kasper, T; Frenzel, P; Haberzettl, T et al. (2013): (Fig. 4) Ostracod associations in sediment core NC_08/01_P4 and calculated relative lake level. https://doi.org/10.1594/PANGAEA.833122
  5. Kasper, T; Frenzel, P; Haberzettl, T et al. (2013): (Fig. 4) Ostracod valves in sediment core NC_08/01_P4. https://doi.org/10.1594/PANGAEA.833123
  6. Kasper, T; Frenzel, P; Haberzettl, T et al. (2013): (Fig. 3) Occurrence of framboidal pyrite within the sediment core NC_08/01_P4. https://doi.org/10.1594/PANGAEA.833121
  7. Kasper, T; Frenzel, P; Haberzettl, T et al. (2013): (Table 1) Total orgaic carbon and total nitrogen contents of lake sediments samples (core NC 08/01 P4), river sediments (river Ce) and terrestrial and aquatic vegetation samples with associated locations. https://doi.org/10.1594/PANGAEA.833119
  8. Kasper, T; Frenzel, P; Haberzettl, T et al. (2013): (Fig. 2) Total organic carbon, total nitrogen, total inorganic carbon, and total sulfur of sediment core NC_08/01_P4. https://doi.org/10.1594/PANGAEA.833120
  9. Kasper, T; Frenzel, P; Haberzettl, T et al. (2013): (Fig. 6) XRF analysis and minerogenic input in sediment core NC_08/01_P4. https://doi.org/10.1594/PANGAEA.833127