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  • 2020-2024  (14)
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  • 1
    Online Resource
    Online Resource
    Ecohydrological Interfaces. (2023)
    Newark :John Wiley & Sons, Incorporated,
    Details
    Keywords: Ecohydrology. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (427 pages)
    Edition: 1st ed.
    ISBN: 9781119489665
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=30786530
    DDC: 577.6
    Language: English
    Note: Intro -- Ecohydrological Interfaces -- Contents -- Preface -- List of Contributors -- Section 1 -- 1 Ecohydrological Interfaces as Hotspots of Ecosystem Processes -- 2 Biological Activity as a Trigger of Enhanced Ecohydrological Interface Activity -- Section 2 -- 3 The Four Interfaces' Components of Riparian Zones -- 4 Organizational Principles of Hyporheic Exchange Flow and Biogeochemical Cycling in River Networks across Scales -- 5 Groundwater-Lake Interfaces -- 6 Coastal-Groundwater Interfaces (Submarine Groundwater Discharge) -- Section 3 -- 7 Identifying and Quantifying Water Fluxes at Ecohydrological Interfaces -- 8 Heat as a Hydrological Tracer -- 9 Sampling at Groundwater-Surface Water Interfaces -- 10 Automated Sensing Methods for Dissolved Organic Matter and Inorganic Nutrient Monitoring in Freshwater Systems -- 11 Tracing Hydrological Connectivity with Aerial Diatoms -- 12 Measurement of Metabolic Rates at the Sediment-Water Interface Using Experimental Ecosystems -- 13 Using Diel Solute Signals to Assess Ecohydrological Processing in Lotic Systems -- 14 Evolving Molecular Methodologies for Monitoring Pathogenic Viruses in Ecohydrological Interfaces -- Section 4 -- 15 Global Environmental Pressures -- 16 Restoring the Liver of the River: Actionable Research Insights to Guide the Restoration of the Hyporheic Zone for the Improvement of Water Quality -- Index -- EULA.
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  • 2
    Online Resource
    Online Resource
    Verbundvorhaben: SegBlaTe - Segmented Blade Technology; Teilvorhaben: Design-Nachweis der Fügestelle : SegBlaTe Schlussbericht - Fraunhofer IWES (2021)
    [Bremerhaven] : Fraunhofer IWES
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (14 Seiten, 232,03 KB) , Illustrationen
    Edition: Version 1.0
    URL: https://doi.org/10.2314/KXP:1777279429
    DOI: 10.2314/KXP:1777279429
    Language: German
    Note: Förderkennzeichen BMWi 0324126C , Verbundnummer 01174054 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden
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  • 3
    Online Resource
    Online Resource
    Radarüberwachung und Kommunikation für Qualitätssicherung und Zustandsüberwachung von Rotorblättern; Forschungsbericht FHG zum Teilvorhaben "Blattfertigung und Blattprüfung" : Laufzeit: 01.11.2018-30.04.2022 (2022)
    [Bremerhaven] : Fraunhofer-Institut für Windenergiesysteme IWES
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (43 Seiten, 3,03 MB) , Illustrationen, Diagramme
    URL: https://edocs.tib.eu/files/e01fb23/1871020867.pdf
    URL: https://doi.org/10.2314/KXP:1871020867
    DOI: 10.2314/KXP:1871020867
    Language: German
    Note: Förderkennzeichen BMWK 0324324E , Verbundnummer 01184058 , Literaturverzeichnis: Seite 43
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  • 4
    Online Resource
    Online Resource
    Verbundvorhaben: Multivariates Schadensmonitoring von Rotorblättern - MultiMonitorRB : Schlussbericht : 1. Teilvorhaben: Messdatenbasiertes und modellgestütztes SHM, 2. Teilvorhaben: Grenztragfähigkeit, 3. Teilvorhaben: Structural Health Monitoring im Betrieb, 4. Teilvorhaben: Optimierung der Schallemissionsprüfung : Laufzeit, Berichtszeitraum des Projektes: 01.03.2017-30.09.2021 (2022)
    Hannover : Gottfried Wilhelm Leibniz Universität Hannover
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (163 Seiten, 42,43 MB) , Illustrationen, Diagramme
    URL: https://edocs.tib.eu/files/e01fb23/1868555291.pdf
    URL: https://doi.org/10.2314/KXP:1868555291
    DOI: 10.2314/KXP:1868555291
    Language: German
    Note: Förderkennzeichen BMWi 0324157A-D , Verbundnummer 01176656
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  • 5
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    Solid phase geochemistry of sediments from ROV push cores during Pourquoi Pas ? cruise INDEX2016, Hydrothermal Vent Outlet in the Kairei Field (2021)
    PANGAEA
    Details
    Publication Date: 2023-04-24
    Description: Deep-sea sediment samples were taken from the (wider) Kairei hydrothermal field area (25°S, 70°E) as well as a remote site (26°S, 71°E) in the Indian Ocean during the INDEX cruise 2016 with the N/O Pourquoi pas? (Ifremer, France). Push core samples from different areas of the Kairei vent field, as well as a sample from the remote site (~200 km south-east from the Kairei), were recovered with the help of the ROV VICTOR 6000 (Ifremer, France). All subsampling steps were carried out shipboard at 4 °C. With sterile syringes (nozzles removed) 3 ml of 2 cm layers of sediment were transferred into sterile falcon tubes for DNA extraction and stored at –80 °C. The remaining sediment was cut into 2 cm slices, freeze-dried, and partially milled to 〈75 mm for geochemical analyses. The sediment was analyzed for carbon chemistry, i.e. total organic carbon (TOC) and total inorganic carbon (TIC) with routine standard methods (IR-detection after combustion, ISO 10694, LECO CS 230 analyzer). Elemental composition of Kairei sediments was estimated by the accredited Actlab Laboratories, Canada (Multimethod mix called Ultratrace 3 program, using INAA, 4-Acid Digestion, ICP-OES, and ICP-MS). Sediments from the remote station were analyzed by routine WD-XRF after fusion with Li-Metaborate/Li-Bromide (XRF spectrometers Philips PW 2400 und Philips PW 1480).
    Keywords: 16S rRNA gene tags; Aluminium oxide; Area/locality; Calcium oxide; Carbon, carbonate; Carbon, organic; Carbon, total; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Element Analyser CS, LECO CS 230; Event label; geochemistry of porewaters; hydrothermal vent; INDEX2016; INDEX2016_12ROV; INDEX2016_20ROV; Indian Ocean; Iron oxide, Fe2O3; Kairei field; Magnesium oxide; Manganese oxide; metalliferous sediments; Phosphorus pentoxide; Potassium oxide; Pourquoi Pas ? (2005); Sample code/label; Silicon dioxide; Sodium oxide; Sulfur, total; Titanium dioxide; VICTOR; Victor6000 ROV
    Type: Dataset
    Format: text/tab-separated-values, 628 data points
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    DATA PANGAEA
  • 6
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    Porewater geochemistry of sediments from ROV push cores during Pourquoi Pas ? cruise INDEX2016, Hydrothermal Vent Outlet in the Kairei Field (2021)
    PANGAEA
    Details
    Publication Date: 2023-03-02
    Description: Deep-sea sediment samples were taken from the (wider) Kairei hydrothermal field area (25°S, 70°E) as well as a remote site (26°S, 71°E) in the Indian Ocean during the INDEX cruise 2016 with the N/O Pourquoi pas? (Ifremer, France). Push core samples from different areas of the Kairei vent field, as well as a sample from the remote site (~200 km south-east from the Kairei), were recovered with the help of the ROV VICTOR 6000 (Ifremer, France). All subsampling steps were carried out shipboard at 4 °C. Porewater from push cores was extracted with rhizons (CSS, 5 cm Rhizosphere Research Products B.V., Netherlands) at a resolution of 2-3 cm, fixed with 1% HNO3 for trace element analyses and stored at 4 °C. With sterile syringes (nozzles removed) 3 ml of 2 cm layers of sediment were transferred into sterile falcon tubes for DNA extraction and stored at –80 °C. Concentrations of minor and trace elements Li, Al, Rb, Cs, Sr, Ba, V, Mn, Fe, Co, Ni, Cu, Zn, Ag, Cd, Tl, Pb, In, Sn, Sb, Bi, W, Mo, U, Au, As, and L were determined by highresolution ICP-SF-MS (Element XR, Thermo Scientific) after 25-fold dilution and spiking with Y and Re for internal standardization using appropriate mass resolution settings.
    Keywords: 16S rRNA gene tags; Aluminium; Antimony; Area/locality; Arsenic; Barium; Cadmium; Caesium; Cerium; Cobalt; Copper; DEPTH, sediment/rock; Europium; Event label; geochemistry of porewaters; hydrothermal vent; ICP-OES; ICP-SF-MS, Thermo Scientific, Element XR; INDEX2016; INDEX2016_12ROV; INDEX2016_20ROV; Indian Ocean; Ion chromatography; Iron; Kairei field; Lanthanum; Lead; Manganese; metalliferous sediments; Molybdenum; Neodymium; Nickel; Nitrate; Pourquoi Pas ? (2005); Praseodymium; Samarium; Sample code/label; Silica, dissolved; Silver; Thallium; Tin; Tungsten; Uranium; Vanadium; VICTOR; Victor6000 ROV; Zinc
    Type: Dataset
    Format: text/tab-separated-values, 942 data points
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  • 7
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    Biogeochemical consequences of nonvertical methane transport in sediment offshore northwestern Svalbard (2020)
    AGU (American Geophysical Union) | Wiley
    Details
    Publication Date: 2023-02-08
    Description: A site at the gas hydrate stability limit was investigated offshore northwestern Svalbard to study methane transport in sediment. The site was characterized by chemosynthetic communities (sulfur bacteria mats, tubeworms) and gas venting. Sediments were sampled with in‐situ porewater collectors and by gravity coring followed by analyses of porewater constituents, sediment and carbonate geochemistry, and microbial activity, taxonomy, and lipid biomarkers. Sulfide and alkalinity concentrations showed concentration maxima in near‐surface sediments at the bacterial mat and deeper maxima at the gas vent site. Sediments at the periphery of the chemosynthetic field were characterized by two sulfate‐methane transition zones (SMTZ) at ~204 and 45 cm depth, where activity maxima of microbial anaerobic oxidation of methane (AOM) with sulfate were found. Amplicon sequencing and lipid biomarker indicate that AOM at the SMTZs was mediated by ANME‐1 archaea. A 1D numerical transport reaction model suggests that the deeper SMTZ‐1 formed on centennial scale by vertical advection of methane, while the shallower SMTZ‐2 could only be reproduced by non‐vertical methane injections starting on decadal scale. Model results were supported by age distribution of authigenic carbonates, showing youngest carbonates within SMTZ‐2. We propose that non‐vertical methane injection was induced by increasing blockage of vertical transport or formation of sediment fractures. Our study further suggests that the methanotrophic response to the non‐vertical methane injection was commensurate with new methane supply. This finding provides new information about for the response time and efficiency of the benthic methane filter in environments with fluctuating methane transport.
    Type: Article , PeerReviewed
    Format: text
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  • 8
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    Persistence of plastic debris and its colonization by bacterial communities after two decades on the abyssal seafloor (2020)
    Nature Research
    Details
    Publication Date: 2023-02-08
    Description: The fate of plastic debris entering the oceans is largely unconstrained. Currently, intensified research is devoted to the abiotic and microbial degradation of plastic floating near the ocean surface for an extended period of time. In contrast, the impacts of environmental conditions in the deep sea on polymer properties and rigidity are virtually unknown. Here, we present unique results of plastic items identified to have been introduced into deep-sea sediments at a water depth of 4150 m in the eastern equatorial Pacific Ocean more than two decades ago. The results, including optical, spectroscopic, physical and microbial analyses, clearly demonstrate that the bulk polymer materials show no apparent sign of physical or chemical degradation. Solely the polymer surface layers showed reduced hydrophobicity, presumably caused by microbial colonization. The bacterial community present on the plastic items differed significantly (p 〈 0.1%) from those of the adjacent natural environment by a dominant presence of groups requiring steep redox gradients (Mesorhizobium, Sulfurimonas) and a remarkable decrease in diversity. The establishment of chemical gradients across the polymer surfaces presumably caused these conditions. Our findings suggest that plastic is stable over extended times under deep-sea conditions and that prolonged deposition of polymer items at the seafloor may induce local oxygen depletion at the sediment-water interface.
    Type: Article , PeerReviewed
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  • 9
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    Microbial Community Compositions and Geochemistry of Sediments with Increasing Distance to the Hydrothermal Vent Outlet in the Kairei Field (2020)
    Taylor & Francis
    Details
    Publication Date: 2023-02-08
    Description: Microbial metabolisms in sediments play a pivotal role in marine element cycling. In hydrothermal sediments chemosynthetic microorganisms likely prevail, while in non-hydrothermally impacted sediment regimes microorganisms associated with organic matter decomposition are primarily recognized. To test how these microorganisms are distributed along the hitherto neglected transition zone influenced to different degrees by hydrothermal input we sampled four sediment sites: these were (i) near an active vent, (ii) the outer rim, and (iii) the inactive area of the Kairei hydrothermal field as well as (iv) sediments roughly 200 km south-east of the Kairei field. Chemistry and microbial community compositions were different at all sampling sites. Against expectations, the sediments near the active vent did not host typical chemosynthetic microorganisms and chemistry did not indicate current, extensive hydrothermal venting. Data from the outer rim area of the active Kairei field suggested microbially mediated saponite production and diffuse hydrothermal flow from below accompanied by increased metal concentrations. A steep redox gradient in the inactive Kairei field points towards significant redox driven processes resulting in dissolution of hydrothermal precipitates and intense metal mobilization. Local microorganisms were primarily Chloroflexi, Bacillales, Thermoplasmata, and Thaumarchaeota.
    Type: Article , PeerReviewed
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    Format: other
    Format: other
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 10
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    Early Diagenetic Imprint on Temperature Proxies in Holocene Corals: A Case Study From French Polynesia (2020)
    Frontiers
    Details
    Publication Date: 2023-02-08
    Description: Coral-based reconstructions of sea surface temperatures (SSTs) using Sr/Ca, U/Ca and δ18O are important tools for quantitative analysis of past climate variabilities. However, post-depositional alteration of coral aragonite, particularly early diagenesis, restrict the accuracy of calibrated proxies even on young corals. Considering the diagenetic effects, we present new Mid to Late Holocene SST reconstructions on well-dated (U/Th: ∼70 yr to 5.4 ka) fossil Porites sp. collected from the Society Islands, French Polynesia. For few corals, quality pre-screening routines revealed the presence of secondary aragonite needles inside primary pore space, resulting in a mean increase in Sr/Ca ratios between 5-30%, in contrast to the massive skeletal parts. Characterized by a Sr/Ca above 10 mmol/mol, we interpret this value as the threshold between diagenetically altered and unaltered coral material. At a high-resolution, observed intra-skeletal variability of 5.4 to 9.9 mmol/mol probably reflects the physiological control of corals over their trace metal uptake, and individual variations controlled by CaCO3– precipitation rates. Overall, the Sr/Ca, U/Ca and δ18O trends are well correlated, but we observed a significant offset up to ± 7°C among the proxies on derived palaeo-SST estimates. It appears that the related alteration process tends to amplify temperature extremes, resulting in increased SST-U/Ca and SST-Sr/Ca gradients, and consequently their apparent temperature sensitivities. A relative SST reconstruction is still feasible by normalizing our records to their individual mean value defined as ΔSST. This approach shows that ΔSST records derived from different proxies agree with an amplitudinal variability of up to ± 2°C with respect to their Holocene mean value. Higher ΔSST values than the mean SSTs (Holocene warm periods) were recorded from ∼1.8 to ∼2.8 ka (Interval I), ∼3.7 to 4.0 ka (Interval III) and before ∼5 ka, while lower ΔSST values (Holocene cold periods, Interval II and IV) were recorded in between. The ensuing SST periodicity of ∼1.5 ka in the Society Islands record is in line with the solar activity reconstructed from 10Be and 14C production (Vonmoos et al., 2006), emphasizing the role of solar activity on climate variability during the Late Holocene.
    Type: Article , PeerReviewed
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