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  • 1
    Online Resource
    Online Resource
    Anorganisch-geochemische Signaturen peruanischer Auftriebssedimente und Porenwässer : [Projekt SO 147 - PERU-Auftrieb] ; [Verbundprojekt] ; [Beginn: 01.03.2000] ; [Ende: 30.06.2002] (2002)
    [Oldenburg : Univ., Inst. für Chemie und Biologie des Meeres]
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: Online-Ressource (8 p. = 854 KB) , graphs, map
    URL: https://edocs.tib.eu/files/e01fb04/390820784.pdf
    URL: https://doi.org/10.2314/GBV:390820784
    URL: https://edocs.tib.eu/files/e01fb04/390820784l.pdf
    DOI: 10.2314/GBV:390820784
    Language: German
    Note: Contract BMBF 03G0147B. - Joint project no. 01017724 , Differences between the printed and electronic version of the document are possible , Also available as printed version , Systemvoraussetzungen: Acrobat reader.
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  • 2
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    The potential of sedimentary foraminiferal rare earth element patterns to trace water masses in the past (2017)
    AGU (American Geophysical Union) | Wiley
    In:  Geochemistry, Geophysics, Geosystems, 18 (4). pp. 1550-1568.
    Details
    Publication Date: 2020-02-06
    Description: Dissolved rare earth element (REE) concentration data from intermediate and deep seawater form an array characterized by higher middle REE enrichments (MREE/MREE*) in the North Atlantic and a progressive increase in heavy-to-light REE ratios (HREE/LREE) as water masses age. The REEs in foraminifera are fractionated towards higher MREE/MREE* and lower HREE/LREE relative to seawater. Calculations based on a scavenging model show that the REE patterns in uncleaned core-top foraminifera resemble those adsorbed onto calcite, particulate organic material, and hydrous ferric oxides but the full extent of the REE fractionation measured in foraminifera was not reproduced by the model. However, differences in the HREE/LREE, MREE/MREE* ratios and the cerium anomaly between ocean basins are preserved and are in agreement with the seawater REE distribution. Under oxic conditions, the HREE/LREE and MREE/MREE* compositions of uncleaned foraminifera at the sediment/seawater boundary are preserved during burial but the cerium anomaly is sensitive to burial depth. In suboxic sedimentary environments, all uncleaned foraminiferal REE concentrations are elevated relative to core-top values indicating addition of REEs from pore waters. The HREE/LREE ratio is highest when sedimentation rates were greatest [Lippold et al., 2009] and when high Fe/Ca ratios in the uncleaned foraminifera indicate that Fe was mobile. In sediments that have not experienced suboxic conditions during burial, uncleaned foraminifera preserve the seawater signal taken up at the sediment/seawater interface and are therefore suggested to be a suitable archive of changes in the REE signal of past bottom waters. This article is protected by copyright. All rights reserved.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1002/2016GC006782
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Carbon isotopes in DIC trace submarine groundwater discharge and advective pore water efflux in tidal areas of the southern North Sea (2014)
    Leibniz-Institut für Angewandte Geophysik
    In:  In: SWIM 2014 23rd Salt Water Intrusion Meeting Programme and Proceedings. Leibniz-Institut für Angewandte Geophysik, Hannover, Germany, pp. 42-45. ISBN 978-3-00-046061-6
    Details
    Publication Date: 2014-07-02
    Type: Book chapter , NonPeerReviewed
    Format: text
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    OceanRep: Book chapter
  • 4
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    Water mass transformation in the Barents Sea inferred from radiogenic neodymium isotopes, rare earth elements and stable oxygen isotopes (2019)
    Elsevier
    In:  Chemical Geology, 511 . pp. 416-430.
    Details
    Publication Date: 2022-01-31
    Description: Highlights • First comprehensive seawater Nd isotope and REE data set for the Barents Sea • Water masses traced with Nd isotopes, salinity and stable oxygen isotopes • No release of particulate REEs to the dissolved load except for cerium • Transformation of Atlantic Water accompanied by pronounced REE removal from the dissolved phase Abstract Nearly half the inflow of warm and saline Atlantic Water (AW) to the Arctic Ocean is substantially cooled and freshened in the Barents Sea, which is therefore considered a key region for water mass transformation in the Arctic Mediterranean. Numerous studies have focused on this transformation and the increasing influence of AW on Arctic climate and biodiversity, yet geochemical investigations of these processes have been scarce. Using the first comprehensive data set of the distributions of dissolved radiogenic neodymium (Nd) isotopes (expressed as ɛNd), rare earth elements (REE) and stable oxygen isotope (δ18O) compositions from this region we are able to constrain the transport and transformation of AW in the Barents Sea and to investigate which processes change the chemical composition of the water masses beyond what is expected from circulation and mixing. Inflowing AW and Norwegian Coastal Water (NCW) both exhibit distinctly unradiogenic ɛNd signatures of −12.4 and −14.5, respectively, whereas cold and dense Polar Water (PW) has considerably more radiogenic ɛNd signatures reaching up to −8.1. Locally formed Barents Sea Atlantic Water (BSAW) and Barents Sea Arctic Atlantic Water (BSAAW) are encountered in the northeastern Barents Sea and have intermediate ɛNd values resulting from admixture of PW containing small amounts of riverine freshwater from the Ob (〈~1.1%) to AW and NCW. Similar to the Laptev Sea, the dissolved Nd isotope composition in the Barents Sea seems to be mainly controlled by water mass advection and mixing despite its shallow water depth. Strikingly, the BSAW and BSAAW are marked by the lowest REE concentrations reaching 11 pmol/kg for Nd ([Nd]), which in contrast to the Nd isotopes, cannot be attributed to the admixture of REE-rich Ob freshwater to AW or NCW ([Nd] = 16.7, and 22 pmol/kg, respectively) and instead reflects REE removal from the dissolved phase with preferential removal of the light over the heavy REEs. The REE removal is, however, not explainable by estuarine REE behavior alone, suggesting that scavenging by (re)suspended (biogenic) particles occurs locally in the Barents Sea. Regardless of the exact cause of REE depletion, we show that AW transformation is accompanied by geochemical changes independent of water mass mixing. This article is part of a special issue entitled: Conway GEOTRACES - edited by Tim M. Conway, Tristan Horner, Yves Plancherel, and Aridane G. González.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    DOI: 10.1016/j.chemgeo.2018.10.002
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Late Pliocene and Early Pleistocene variability of the REE and Nd isotope composition of Caribbean bottom water: A record of changes in sea level and terrestrial inputs during the final stages of Central American Seaway closure (2019)
    AGU (American Geophysical Union) | Wiley
    In:  Paleoceanography and Paleoclimatology, 34 . pp. 2067-2079.
    Details
    Publication Date: 2022-01-31
    Description: The isotopic composition of neodymium dissolved in seawater consists of a distal, advected component that reflects water mass mixing and circulation, but near land can also contain a large local component originating from terrestrial sources such as aeolian or fluvial material. In order to use Nd isotopes to reconstruct paleocirculation, it is important to detect any local influences on the seawater signal recorded in deep sea sediments. Here we present rare earth element (REE) and Nd isotope (εNd) records from the deep Caribbean for two well‐studied time intervals in the Late Pliocene and Early Pleistocene. We measured trace element and REE compositions of weakly cleaned foraminifera to investigate if the Nd isotope signal from the same samples contained a local component. We find distinct changes in REE compositions across glaciations that are consistent with increases in the supply of local terrestrial material to the basin likely the results of glacially driven changes in sea level. Despite these larger terrestrial inputs, the Ce anomaly (Ce/Ce*) became more pronounced during glaciations indicating a better deep Caribbean ventilation. Short negative Nd isotope excursions occurred during three of the four studied glaciations, independently of any other proxy indicators for changes in ocean circulation suggesting that inputs from local terrigenous sources of Nd controlled the signal. We recommend that studies that aim to use εNd as a paleocirculation tracer routinely measure REE compositions of the authigenic phase to identify any possible terrestrial influence on the signal.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2019PA003654
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Transformation of silicon in a sandy beach ecosystem: Insights from stable silicon isotopes from fresh and saline groundwaters (2016)
    Elsevier
    Details
    Publication Date: 2023-06-29
    Description: Dissolved silicon isotope compositions (δ30Si) have been analysed for the first time in groundwaters of beach sediments, which represent a subterranean estuary with fresh groundwater discharge from a freshwater reservoir and mixing with recirculated seawater. The fresh groundwater reservoir has high and variable dissolved silica concentrations between 136 and 736 μM, but homogeneous δ30Si of +1.0 ± 0.15‰. By contrast, the seawater is strongly depleted in dissolved silica with concentrations of 3 μM, and consequently characterised by high δ30Si of +3.0‰. The beach groundwaters are variably enriched in dissolved silica compared to seawater (23–192 μM), and concentrations increase with depth at all sampling sites. The corresponding δ30Si values are highly variable (+0.3‰ to +2.2‰) and decrease with depth at each site. All groundwater δ30Si values are lower than seawater and most values are lower than dissolved δ30Si of freshwater discharge indicating a significant amount of lithogenic silica dissolution in beach sediments. In contrast to open North Sea sediments, diatom dissolution or formation of authigenic silica in beach sediments is very low (ca. 5 μmol Si g−1). Silica discharge from the beach to the coastal ocean is estimated as approximately 210 mol Si yr−1 per meter shoreline. Considering the extent of coastline this is, at least for the study area, a significant amount of the total Si budget and amounts to ca. 1% of river and 3.5% of backbarrier tidal flat area Si input.
    Type: Article , PeerReviewed
    Format: text
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  • 7
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    Dissolved rare earth element concentrations and neodymium isotope compositions in the central Arctic Ocean during FS Polarstern PS94 (GEOTRACES GN04) (2021)
    PANGAEA
    Details
    Publication Date: 2023-12-09
    Description: We present spatially highly resolved distributions of dissolved seawater rare earth element concentrations and neodymium isotopes along a transect in the central Arctic Ocean from FS Polarstern cruise PS94 (GEOTRACES GN04) in August-October 2015. Seawater samples were collected using Niskin bottles and filtered through AcroPak 500 filter cartridges (pore size 0.8/0.2 µm) directly from the Niskin bottles onboard.
    Keywords: Arctic Ocean; ARK-XXIX/3; Based on definitions by Rudels et al. (2012); Bottle number; Calculated, PAAS-normalized (Rudnick and Gao, 2003); Cerium, dissolved; Cerium anomaly, dissolved; Comment; CTD/Rosette; CTD/Rosette, ultra clean; CTD-RO; CTD-UC; DATE/TIME; DEPTH, water; Dysprosium, dissolved; ELEVATION; Erbium, dissolved; Europium, dissolved; Europium anomaly, dissolved; Event label; Gadolinium, dissolved; Gadolinium anomaly, dissolved; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; Heavy rare-earth elements/light rare-earth elements ratio, dissolved; Holmium, dissolved; Lanthanum, dissolved; LATITUDE; LONGITUDE; Lutetium, dissolved; Neodymium, dissolved; Neodymium isotopes; Polarstern; Praseodymium, dissolved; PS94; PS94/032-7; PS94/032-9; PS94/040-1; PS94/040-3; PS94/050-1; PS94/050-4; PS94/050-6; PS94/050-8; PS94/058-1; PS94/058-3; PS94/068-1; PS94/069-2; PS94/069-4; PS94/070-1; PS94/070-4; PS94/081-2; PS94/081-5; PS94/096-2; PS94/096-7; PS94/101-2; PS94/101-5; PS94/101-7; PS94/115-1; PS94/117-2; PS94/117-4; PS94/125-2; PS94/125-5; PS94/134-1; Rare earth elements; Salinity; Samarium, dissolved; Temperature, water; Terbium, dissolved; Thulium, dissolved; Water mass; Ytterbium, dissolved; ε-Neodymium, dissolved; ε-Neodymium, error, dissolved
    Type: Dataset
    Format: text/tab-separated-values, 3320 data points
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    DATA PANGAEA
  • 8
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    Geochemistry of bulk sediment of sediment core CP10BC (2022)
    PANGAEA
    Details
    Publication Date: 2023-12-09
    Keywords: AGE; Aluminium; Barium; Barium, biogenic; Barium, biogenic/Aluminium ratio; Barium/Aluminium ratio; BC; Box corer; Carbon, organic, total; CORTADO; CP10BC; DEPTH, sediment/rock; elemental geochemistry; Manganese; Mediterranean; Nd isotopes; North Africa; Pelagia; Potassium; Potassium/Aluminium ratio; provenance study; Sample code/label; Sapropel S1; Sr isotopes; Titanium; Titanium/Aluminium ratio; Zirconium; Zirconium/Aluminium ratio
    Type: Dataset
    Format: text/tab-separated-values, 1988 data points
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    DATA PANGAEA
  • 9
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    Age determination of sediment core CP10BC (2022)
    PANGAEA
    Details
    Publication Date: 2023-12-09
    Keywords: Age, 14C AMS; Age, 14C calibrated, CALIB 7.0 with MARINE13 calibration curve (Reimer et al. 2013); Age, dated; Age, dated standard deviation; BC; Box corer; calculated, 2 sigma; Calendar age; Calendar age, standard deviation; CORTADO; CP10BC; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; elemental geochemistry; Laboratory code/label; Mediterranean; Nd isotopes; North Africa; Pelagia; provenance study; Sapropel S1; Sr isotopes
    Type: Dataset
    Format: text/tab-separated-values, 28 data points
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    DATA PANGAEA
  • 10
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    Strontium ratios of sediment core CP10BC (2022)
    PANGAEA
    Details
    Publication Date: 2023-12-09
    Keywords: AGE; BC; Box corer; calculated, 2 sigma; CORTADO; CP10BC; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; elemental geochemistry; Mediterranean; Nd isotopes; Neodymium-143/Neodymium-144 ratio; North Africa; Pelagia; provenance study; Sapropel S1; Sr isotopes; Strontium; Strontium-87/Strontium-86 ratio; ε-Neodymium, standard deviation; ε-Neodymium (0)
    Type: Dataset
    Format: text/tab-separated-values, 189 data points
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    DATA PANGAEA
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