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  • biogeochemistry  (2)
  • 157-951; 157-952; Atlantic; Canarias Sea; Carbon, organic, total; COMPCORE; Composite Core; DEPTH, sediment/rock; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg157; Ocean Drilling Program; ODP; PC; Piston corer; Preservation factor; Sample code/label; South Atlantic Ocean; Tyro_90P22; δ13C, organic carbon  (1)
Document type
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  • 1
    Electronic Resource
    Electronic Resource
    Nitrous oxide emissions from estuarine intertidal sediments (1995)
    Springer
    Hydrobiologia 311 (1995), S. 43-55 
    Details
    ISSN: 1573-5117
    Keywords: nitrous oxide ; nitrogen cycling ; estuarine sediments ; biogeochemistry ; eutrophication ; Scheldt Estuary
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract From September 1990 through December 1991 nitrous oxide flux measurements were made at 9 intertidal mud flat sites in the Scheldt Estuary. Nitrous oxide release rates were highly variable both between sites and over time at any one site. Annual nitrous oxide fluxes vary from about 10 mmol N m−2 at the tidal fresh-water end-member site to almost zero at the most saline stations. Along the estuarine gradient, annual nitrous oxide fluxes are significantly correlated with sedimentary organic carbon and nitrogen concentrations, ammonium fluxes and annual nitrogen turn-over rates, that are estimated using mass-balance considerations. Nitrous oxide fluxes seem to respond linearly to an increasing nitrogen load, with one out of each 17 000 atoms nitrogen entering estuaries being emitted as nitrous oxide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00008570
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Sediment biogeochemistry in an East African mangrove forest (Gazi Bay, Kenya) (1996)
    Springer
    Biogeochemistry 34 (1996), S. 133-155 
    Details
    ISSN: 1573-515X
    Keywords: biogeochemistry ; mangrove ; sediments ; organic carbon ; nitrogen ; carbonate dissolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract The biogeochemistry of mangrove sediments was investigated in several mangrove forest communities in Gazi Bay, a coastal lagoon in Kenya, Africa. Carbon dioxide fluxes, sediment median grain sizes, sedimentary organic carbon, nitrogen and phosphorus contents and pore-water characteristics (ammonium, nitrate, sulfate and chloride) could be related to forest type. Mangrove sediments have pH values that range from 3.5 to 8.3 due to the limited buffer capacity of these sediments and intense acidifying processes such as aerobic degradation of organic matter, oxidation of reduced components, ammonium uptake by roots and root respiration. The mangrove sediments are nitrogen-rich compared to mangrove litter, as a result of microbial nitrogen retention, uptake and fixation, and import of nitrogen-rich material. It appears that mangrove sediments in Gazi Bay act as a nutrient and carbon sink rather than as a source for adjacent seagrass and reef ecosystems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00000899
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    Paper (German National Licenses)
    Fulltext
  • 3
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    (Table 1) TOC, δ¹³C, and preservation factors of turbidite sediments (2008)
    PANGAEA
    In:  Supplement to: Huguet, Carme; de Lange, Gert J; Gustafsson, Örjan; Middelburg, Jack J; Sinninghe Damsté, Jaap S; Schouten, Stefan (2008): Selective preservation of soil organic matter in oxidized marine sediments (Madeira Abyssal Plain). Geochimica et Cosmochimica Acta, 72(24), 6061-6068, https://doi.org/10.1016/j.gca.2008.09.021
    Details
    Publication Date: 2024-01-09
    Description: In ocean margin sediments both marine and terrestrial organic matter (OM) are buried but the factors governing their relative preservation and degradation are not well understood. In this study, we analysed the degree of preservation of marine isoprenoidal and soil-derived branched glycerol dialkyl glycerol tetraethers (GDGTs) upon long-term oxygen exposure in OM-rich turbidites from the Madeira Abyssal Plain by analyzing GDGT concentrations across oxidation fronts. Relative to the anoxic part of the turbidites ca. 7-20% of the soil-derived branched GDGTs were preserved in the oxidized part while only 0.2-3% of the marine isoprenoid GDGT crenarchaeol was preserved. Due to these different preservation factors the Branched Isoprenoid Tetraether (BIT) index, a ratio between crenarchaeol and the major branched GDGTs that is used as a tracer for soil-derived organic matter, substantially increases from 0.02 to 0.4. Split Flow Thin Cell (SPLITT) separation of turbidite sediments showed that the enhanced preservation of soil-derived carbon was a general phenomenon across the fine particle size ranges (〈38 mm). Calculations reveal that, despite their relatively similar chemical structures, degradation rates of crenarchaeol are 2-fold higher than those of soil-derived branched GDGTs, suggesting preferential soil OM preservation possibly due to matrix protection.
    Keywords: 157-951; 157-952; Atlantic; Canarias Sea; Carbon, organic, total; COMPCORE; Composite Core; DEPTH, sediment/rock; DSDP/ODP/IODP sample designation; Event label; Joides Resolution; Leg157; Ocean Drilling Program; ODP; PC; Piston corer; Preservation factor; Sample code/label; South Atlantic Ocean; Tyro_90P22; δ13C, organic carbon
    Type: Dataset
    Format: text/tab-separated-values, 80 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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