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  • 2020-2024  (13)
  • 1995-1999  (2)
  • 2021  (13)
  • 1998  (2)
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Year
  • 1
    Online Resource
    Online Resource
    The Holocene Sapropel S1 in the Ionian Sea : paleoceanography and geochemistry : (Teil B: Laborarbeit) (1998)
    Kiel
    Details Availability
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (108 Seiten = 5 MB) , Graphen, Karte
    Edition: Online-Ausgabe 2023
    URL: https://oceanrep.geomar.de/id/eprint/50862/
    Language: English
    Note: Zusammenfassung in deutscher und englischer Sprache
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  • 2
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    The Holocene Sapropel S1 in the Ionian Sea: paleoceanography and geochemistry (1998)
    Details
    Publication Date: 2023-08-10
    Description: Sequences of sapropels intercalated with hemipelagic mud are a prominent feature of most eastern Mediterranean sediments. The most recent sapropel (S 1 ), recovered in a box core from the Medina Rise in the Ionian Sea, was sampled at ultra-high resolution to evaluate the paleoceanographic conditions during its formation, to characterise its organic matter and to determine post-depositional effects of diagenesis on the geochemistry. The paleoceanographic reconstruction was based on oxygen and carbon isotope compositions of planktonic foraminifera and planktonic foraminiferal census counts to estimate paleo sea surface temperatures. Combined, these results indicate a depleted surface water salinity of about 4 psu and, thus, also surface water density, which at least weakened vertical circulation and thus, bottom water ventilation during sapropel formation. However, sapropel formation may not have been caused by depleted bottom water oxygen levels alone. Significantly increased rates of primary production during times of sapropel deposition are inferred from enhanced barium accumulation rates. The immobility and stability of barium as barite in most Mediterranean sediments makes it a valuable proxy for paleoproductivity in this case. Lipid analyses were conducted for characterisation of sapropel organic matter and estimation of possible carbon sources. Results of the extractable lipids clearly indicate a predominantly marine origin, with dinoflagellates, coccolithophorid algae, other microalgae and eubacteria as main contributing organisms. Comparison with overlying oxidised samples reveals no enrichment of terrestrial organic matter. The ratio of unsaturated long-chain-ketones is strongly affected by sapropel oxidation, so that the derived paleotemperature estimates should used with caution. Elemental concentrations were measured to recognise effects of the post-depositional oxidation front prograding into the formerly anoxic sediment. As a consequence, the present thickness of the organic-rich layer is only a fifth of its original extent. The maximum dissolution effect of diagenetic reactions cannot explain the observed depletions in carbonate content in the sapropel. Decreased carbonate production during sapropel formation is therefore concluded. Diagenetic relocation of many redox-sensitive elements has occurred. Most elements expected to be associated with organic matter or sulphide-rich sediments display maximum concentrations above or below the present sapropel layer. Similarities are observed in the geochemical behaviour of Ni, Cu, Zn, and Co; and of Mo, V, and Sb. Se exhibits a large, sharp concentration peak and is inferred to be a useful marker for the present boundary of oxic to post-oxic conditions. A model of the oxygen-flux into the sapropel interval closely resembles the observed enrichments of oxidised elements. The sapropel is thus still being oxidised.
    Type: Thesis , NonPeerReviewed
    Format: text
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    OceanRep: Thesis - not published by a publisher
  • 3
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    The nature, timescale, and efficiency of riverine export of terrestrial organic carbon in the (sub)tropics: Insights at the molecular level from the Pearl River and adjacent coastal sea (2021)
    In:  EPIC3Earth and Planetary Science Letters, 565, pp. 116934, ISSN: 0012821X
    Details
    Publication Date: 2023-06-21
    Description: Tropical and subtropical rivers deliver large quantities of terrestrial organic carbon (OCterr) to the ocean, acting as a crucial part of the global carbon cycle, but little is known about the timescale and efficiency of its transport to and in the adjacent coastal sea. Here we examined source-specific biomarker (fatty acids, FAs) contents and isotope compositions in surface sediments in an alongshore transect southwestward from the Pearl River mouth. The C28+30, rather than other long-chain saturated FAs, were found to be the most representative for OCterr, and a plant wax mean age of 3060 ±90 yr (resulting from protracted storage) was estimated in the Pearl River watershed from the 14C age of C28+30FA in a river mouth sample. A compilation of plant wax mean ages in global (sub)tropical river systems including this study suggests that regional differences in climate and morphology may have a limited impact on plant wax mean ages in (sub)tropical regions. A four-source mixing model based on bulk OC and biomarker isotope compositions demonstrated that surface sediments in the Pearl River-derived mudbelt consist of 0.15–0.36 wt.% marine OC, 0.03–0.13 wt.% riverine primary production-derived OC, 0.18–0.49 wt.% soil OC, and 0.07–0.16 wt.% fossil OC. The mean burial efficiency of fossil and soil OC is ∼85% and 49%, respectively, indicating the refractory nature of fossil OC but a significant loss of soil OC due to remineralization during transport in the marine environment before final burial. Over longer timescales, the OCterrloss experienced during transport may, thus, to some extent reduces the capacity of terrestrial ecosystems (particularly soils) as CO2sinks.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 4
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    Elemental composition of sediment core M125-67-4 (2021)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Keywords: AGE; dD; DEPTH, sediment/rock; GC; Gravity corer; ln-Potassium/Aluminium ratio; M125; M125_451-4; M125-67-4; Meteor (1986); SAMBA; South Atlantic Ocean; X-ray fluorescence (XRF); XRD; XRF
    Type: Dataset
    Format: text/tab-separated-values, 434 data points
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    DATA PANGAEA
  • 5
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    δD on lipid plant waxes of sediment core M125-67-4 (2021)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Keywords: AGE; dD; DEPTH, sediment/rock; GC; Gravity corer; M125; M125_451-4; M125-67-4; Meteor (1986); n-Alkane C29, δD; n-Alkane C29, δD, standard error; SAMBA; South Atlantic Ocean; XRD; XRF
    Type: Dataset
    Format: text/tab-separated-values, 16 data points
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    DATA PANGAEA
  • 6
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    Mineralogical composition of sediment core M125-67-4 (2021)
    PANGAEA
    Details
    Publication Date: 2024-02-02
    Keywords: AGE; dD; DEPTH, sediment/rock; GC; Gravity corer; Kaolinite; ln-Microcline/Kaolinite ratio; M125; M125_451-4; M125-67-4; Meteor (1986); Microcline; SAMBA; South Atlantic Ocean; X-ray diffraction (XRD); XRD; XRF
    Type: Dataset
    Format: text/tab-separated-values, 231 data points
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    DATA PANGAEA
  • 7
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    Geochemical data from sediment core M125-67-4 (2021)
    PANGAEA
    Details
    Publication Date: 2024-04-25
    Description: The data set has been obtained on gravity core M125-67-4 from off the Jequitinhonha River, East Brazil. The obtained proxies described the hydrological conditions in the river's hinterland over the past ~ 5000 years as measure of fluctuations in the South American Summer Monsoon intensity. XRF-derived K/Al ratios and mineral phases determined by XRD reflect weathering state in the hinterland; high K/Al ratio and low kaolinite contents indicate dry conditions (and vice versa for low K/Al and high kaolinite conditions). Hydrogen isotopes are interpreted to primarily reflect precipitation amount, with low values indicating more precipitation.
    Keywords: dD; GC; Gravity corer; M125; M125_451-4; M125-67-4; Meteor (1986); SAMBA; South Atlantic Ocean; XRD; XRF
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 8
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    Levoglucosan data from the Amazon River System and the tropical Atlantic Ocean (2021)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Description: The data set contains concentration data of the source-specific low-temperature biomass burning tracer levoglucosan from riverbed and suspended sediments from the Amazon River System and marine surface sediments from the tropical Atlantic Ocean. Both riverine and marine sample material consists of modern sediments. The data was measured in 2017 at the Royal Netherlands Institute for Sea Research (NIOZ) using an Agilent 1290 Infinity Ultra-high performance liquid chromatographer (UHPLC) coupled to an Agilent 6230 Time-Of-Flight (TOF) mass spectrometer. The purpose of the measurements was to assess the transport and deposition of low-temperature pyrogenic carbon in the Amazon River System and adjacent marine deposition areas.
    Keywords: Amazon Rainforest; Amazon River; levoglucosan; marine deposition; marine sediment; pyrogenic carbon; river sediment; river transport; Suspended Particulate Matter (SPM); widfire
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 9
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    Bulk organic matter composition, n-alkane distribution patterns, and compound-specific stable isotope compositions of modern surface sediments and plants of South Africa's largest freshwater wetland (2021)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Description: Surface sediments (n=41) reflecting modern times (uppermost 10 cm) were collected during a November/December 2018 field campaign along the course of the Mkhuze River and a transect into Lake St. Lucia (KwaZulu Natal Province, South Africa). In addition, plant species (n=10) were collected based on previous reports of dominant vegetation communities and local occurrences. All samples were extracted soon after with a mixture of dichloromethane and methanol (9:1), purified, and fractionated. The apolar fraction was finally analyzed for its n-alkane concentrations and corresponding compound-specific carbon and hydrogen isotope compositions. Sub-samples of the surface sediments were also analyzed for (i) organic matter content (total organic carbon) and composition (d13C, carbon-to-nitrogen ratio) after decalcification, and (ii) for thermal indices (Hydrogen Index, R-index, I-index) using Rock-Eval analyses. The study's objective was to evaluate the most extensive freshwater wetland system in South Africa regarding its current condition and functioning by identifying the origin and transport pathways of sedimentary organic matter.
    Keywords: Carbon, organic, total; Carbon/Nitrogen ratio; d13C; dD; DEPTH, sediment/rock; Event label; Hydrogen index; I-index; Latitude of event; Longitude of event; MK01-10; MK02-2; MK02-3; MK03-1; MK03-2; MK03-3; MK04-1; MK05-1; MK06-1; MK07-2; MK07-3; MK07-4; MK07-5_1; MK07-5_2; MK07-6; MK07-7; MK08-2; MK08-4; MK09-2; MK10-1; MK12-1; MK12-3; MK13-1; MK14-1; MK15-1; MK16-1; MK17-1; MK18-1; MK19-1; MK20-1; MK20-2; MK21-1; MK21-4; MK21-5; MK22-1; MK23-1; MK24-4; MK24-5; MK25-1; MK26-1; MK27-1; MK28-1; MK29-1; MK30-1; MK31-1; MK32-1; MK33-1; MK34-1; MK35-1; MK36-1; MK37-2; Mkuze River; n-Alkane C16; n-Alkane C17; n-Alkane C18; n-Alkane C19; n-Alkane C20; n-Alkane C21; n-Alkane C22; n-Alkane C23; n-Alkane C23, δ13C; n-Alkane C23, δ13C, standard deviation; n-Alkane C24; n-Alkane C25; n-Alkane C25, δ13C; n-Alkane C25, δ13C, standard deviation; n-Alkane C25, δD; n-Alkane C25, δD, standard deviation; n-Alkane C26; n-Alkane C27; n-Alkane C27, δ13C; n-Alkane C27, δ13C, standard deviation; n-Alkane C27, δD; n-Alkane C27, δD, standard deviation; n-Alkane C28; n-Alkane C29; n-Alkane C29, δ13C; n-Alkane C29, δ13C, standard deviation; n-Alkane C29, δD; n-Alkane C29, δD, standard deviation; n-Alkane C30; n-Alkane C31; n-Alkane C31, δ13C; n-Alkane C31, δ13C, standard deviation; n-Alkane C31, δD; n-Alkane C31, δD, standard deviation; n-Alkane C32; n-Alkane C33; n-Alkane C33, δ13C; n-Alkane C33, δ13C, standard deviation; n-Alkane C33, δD; n-Alkane C33, δD, standard deviation; n-Alkane C34; n-Alkane C35; n-Alkane C35, δ13C; n-Alkane C35, δ13C, standard deviation; n-Alkane C35, δD; n-Alkane C35, δD, standard deviation; n-alkanes; Nitrogen, total; organic matter; plant waxes; R-Index; Rock-Eval; Sample comment; Sample type; South Africa; Species; TRACES; Tracing Human and Climate impacts in South Africa; wetland; δ13C, bulk carbonate
    Type: Dataset
    Format: text/tab-separated-values, 2231 data points
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    DATA PANGAEA
  • 10
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    Inorganic geochemical down-core data from discrete XRF measurements of sediment core GeoB20616-1 (2021)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Description: This record allows a high-resolution continental climatic reconstruction for the past ca. 100,000 yrs for the Delagoa Bight. Climate sensitive proxies, like the elemental indicators for fluvial input and weathering type provide information on climatic changes in the adjacent catchment areas (Incomati, Matola, and Lusutfu rivers).
    Keywords: AGE; Aluminium; Calcium; DEPTH, sediment/rock; GC; GeoB20616-1; Gravity corer; Iron; M123; M123_175-1; Meteor (1986); Potassium; RAiN; Regional Archives for Integrated iNvestigations; X-ray fluorescence (XRF)
    Type: Dataset
    Format: text/tab-separated-values, 848 data points
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    DATA PANGAEA
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