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  • 2020-2024  (190)
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  • 1
    Online Resource
    Online Resource
    Accelerating Digitalization : Chancen der Digitalisierung Erkennen und Nutzen (2021)
    Wiesbaden : Springer Fachmedien Wiesbaden GmbH
    Details Availability
    Keywords: Electronic books
    Description / Table of Contents: Intro -- Vorwort -- Inhaltsverzeichnis -- Über die Autoren -- 1 Digitalisierung - Status quo und ungenutzte Potenziale -- 2 Chancen der Digitalisierung - Transaktionskosten im traditionellen Geschäft senken, neue Interaktionen verstärken -- 2.1 Verringerung der Transaktionskosten im traditionellen Geschäft entlang der Wertkette durch Digitalisierung -- 2.2 Zusammenarbeit auf technischen Plattformen durch Digitalisierung als Voraussetzung für neue, innovative Kundenlösungen und Geschäftsmodelle -- 3 Nutzung der Chancen der Digitalisierung durch digitale Leistungen - Technologien und Prozesse, Angebote und Geschäftsmodelle verbessern oder verändern -- 3.1 Ausdifferenzierung von Technologien und Prozessen durch Digitalisierung -- 3.2 Ausdifferenzierung der Angebote und Geschäftsmodelle durch Digitalisierung -- 4 Nutzung der Chancen der Digitalisierung durch digitale Fähigkeiten - Unsicherheit bei langfristigen Veränderungen bewältigen -- 4.1 Bewältigung von Unsicherheit durch Veränderungsfähigkeiten -- 4.2 Veränderungsfähigkeiten des Sensing, Seizing und Reconfiguring -- 4.3 Operative Fähigkeiten -- 5 Digital Maturity Assessment - Bisherige Transformation, Typen digitaler Unternehmen, Branchen- und Ländervergleich -- 5.1 Digital Maturity Index (DMI): Konzept und Untersuchungsansatz -- 5.2 Digital Maturity Assessment (1): Bisherige digitale Transformation deutscher Unternehmen -- 5.3 Digital Maturity Assessment (2): Archetypen digitaler Unternehmen -- 5.4 Digital Maturity Assessment (3): Vergleich der bisherigen digitalen Transformation nach Branchen -- 5.5 Digital Maturity Assessment (4): Vergleich der bisherigen digitalen Transformation in verschiedenen Regionen -- 6 Accelerating Digitalization - Ansatzpunkte zur Beschleunigung der Digitalisierung -- 6.1 Wege zur Erhöhung der digitalen Reife.
    Type of Medium: Online Resource
    Pages: 1 online resource (170 pages)
    ISBN: 9783658314569
    URL: https://ebookcentral.proquest.com/lib/kxp/detail.action?docID=6523289
    Language: German
    Note: Description based on publisher supplied metadata and other sources
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  • 2
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    Excess 210Pb of sediment cores during METEOR cruise M136 (2020)
    PANGAEA
    Details
    Publication Date: 2023-10-28
    Keywords: Climate - Biogeochemistry Interactions in the Tropical Ocean; DEPTH, sediment/rock; Event label; Lead-210 excess; M136; M136_412-1; M136_426-1; M136_483-1; M136_543-1; M136_574-1; M136_577-1; M136_588-1; Meteor (1986); Multicorer with television; Replicate; Sample code/label; SFB754; TVMUC
    Type: Dataset
    Format: text/tab-separated-values, 192 data points
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    DATA PANGAEA
  • 3
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    Sediment release of dissolved organic matter to the oxygen minimum zone off Peru (2020)
    Copernicus Publications (EGU)
    Details
    Publication Date: 2023-02-09
    Description: The eastern tropical South Pacific (ETSP) represents one of the most productive areas in the ocean that is characterized by a pronounced oxygen minimum zone (OMZ). Particulate organic matter (POM) that sinks out of the euphotic zone is supplied to the anoxic sediments and utilized by microbial communities. The degradation of POM is associated with dissolved organic matter (DOM) production and reworking. The release of recalcitrant DOM to the overlying waters may represent an important organic matter escape mechanism from remineralization within sediments but received little attention in OMZ regions so far. Here, we combine measurements of dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) with DOM optical properties in the form of chromophoric (CDOM) and fluorescent (FDOM) DOM from pore waters and near-bottom waters of the ETSP off Peru. We evaluate diffusion–driven fluxes and net in situ fluxes of DOC and DON in order to investigate processes affecting DOM cycling at the sediment–water interface along a transect 12° S. To our knowledge, these are the first data for sediment release of DON and pore water CDOM and FDOM for the ETSP off Peru. Pore-water DOC and DON accumulated with increasing sediment depth, suggesting an imbalance between DOM production and remineralization within sediments. High DON accumulation resulted in very low pore water DOC / DON ratios (〉 1) which could be caused by either an "imbalance" in DOC and DON remineralization, or to the presence of an additional nitrogen source. Diffusion driven fluxes of DOC and DON exhibited high spatial variability. They varied from 0.2–0.1 mmol m−2 d−1 to 2.52–1.3 mmol m−2 d−1 and from −0.042–0.02 mmol m−2 d−1 to 3.32–1.7 mmol m−2 d−1, respectively. Generally low net in situ DOC and DON fluxes as well as steepening of spectral slope (S) of CDOM and accumulation of humic-like FDOM at the near-bottom waters over time indicated active microbial DOM utilization at the sediment–water interface, potentially stimulated by nitrate (NO3−) and nitrite (NO2−). The microbial DOC utilization rates, estimated in our study, may be sufficient to support denitrification rates of 0.2–1.4 mmol m−2 d−1, suggesting that sediment release of DOM contributes substantially to nitrogen loss processes in the ETSP off Peru.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Influence of intraseasonal eastern boundary circulation variability on hydrography and biogeochemistry off Peru (2020)
    Copernicus Publications (EGU)
    Details
    Publication Date: 2023-02-08
    Description: The intraseasonal evolution of physical and biogeochemical properties during a coastal trapped wave event off central Peru is analysed using data from an extensive shipboard observational programme conducted between April and June 2017, and remote sensing data. The poleward velocities in the Peru–Chile Undercurrent were highly variable and strongly intensified to above 0.5 m s−1 between the middle and end of May. This intensification was likely caused by a first-baroclinic-mode downwelling coastal trapped wave, excited by a westerly wind anomaly at the Equator and originating at about 95∘ W. Local winds along the South American coast did not impact the wave. Although there is general agreement between the observed cross-shore-depth velocity structure of the coastal trapped wave and the velocity structure of first vertical mode solution of a linear wave model, there are differences in the details of the two flow distributions. The enhanced poleward flow increased water mass advection from the equatorial current system to the study site. The resulting shorter alongshore transit times between the Equator and the coast off central Peru led to a strong increase in nitrate concentrations, less anoxic water, likely less fixed nitrogen loss to N2 and a decrease of the nitrogen deficit compared to the situation before the poleward flow intensification. This study highlights the role of changes in the alongshore advection due to coastal trapped waves for the nutrient budget and the cumulative strength of N cycling in the Peruvian oxygen minimum zone. Enhanced availability of nitrate may impact a range of pelagic and benthic elemental cycles, as it represents a major electron acceptor for organic carbon degradation during denitrification and is involved in sulfide oxidation in sediments.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    The control of hydrogen sulfide on benthic iron and cadmium fluxes in the oxygen minimum zone off Peru (2020)
    Copernicus Publications (EGU)
    Details
    Publication Date: 2023-02-08
    Description: Sediments in oxygen-depleted marine environments can be an important sink or source of bio-essential trace metals in the ocean. However, the key mechanisms controlling the release from or burial of trace metals in sediments are not exactly understood. Here, we investigate the benthic biogeochemical cycling of Fe and Cd in the oxygen minimum zone off Peru. We combine bottom water profiles, pore water profiles, as well as benthic fluxes determined from pore water profiles and in-situ from benthic chamber incubations along a depth transect at 12° S. In agreement with previous studies, both concentration-depth profiles and in-situ benthic fluxes indicate a Fe release from sediments into bottom waters. Diffusive Fe fluxes and Fe fluxes from benthic chamber incubations are roughly consistent (0.3–17.1 mmol m−2 y−1), indicating that diffusion is the main transport mechanism of dissolved Fe across the sediment-water interface. The occurrence of mats of sulfur oxidizing bacteria on the seafloor represents an important control on the spatial distribution of Fe fluxes by regulating hydrogen sulfide (H2S) concentrations and, potentially, Fe sulfide precipitation within the surface sediment. Removal of dissolved Fe after its release to anoxic bottom waters is rapid in the first 4 m away from the seafloor (half-life 〈 3 min) which hints to oxidative removal by nitrite or interaction with particles in the benthic boundary layer. Benthic flux estimates of Cd are indicative of a flux into the sediment within the oxygen minimum zone. Fluxes from benthic chamber incubations (up to 22.6 µmol m−2 y−1) exceed the diffusive fluxes (〈 1 µmol m−2 y−1) by a factor 〉 25, indicating that downward diffusion of Cd across the sediment-water interface is of subordinate importance for Cd removal from benthic chambers. As Cd removal in benthic chambers co-varies with H2S concentrations in the pore water of surface sediments, we argue that Cd removal is mediated by precipitation of CdS within the chamber. A mass balance approach, taking into account the contributions of diffusive fluxes and fluxes measured in benthic chambers as well as Cd delivery with organic material suggests that CdS precipitation in the near-bottom water could make an important contribution to the overall Cd mass accumulation in the sediment solid phase. According to our results, the solubility of trace metal sulfide minerals (Cd 〈〈 Fe) is a key-factor controlling trace metal removal and consequently the magnitude as well as the temporal and spatial heterogeneity of sedimentary fluxes. We argue that depending on their sulfide solubility, sedimentary source or sink fluxes of trace metals will change differentially as a result of declining oxygen concentrations and an associated expansion of sulfidic surface sediments. Such a trend could cause a change in the trace metal stoichiometry of upwelling water masses with potential consequences for marine ecosystems in the surface ocean.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Suitability analysis and revised strategies for marine environmental carbon capture and storage (CCS) monitoring (2021)
    Elsevier
    Details
    Publication Date: 2024-02-07
    Description: Highlights • Approaches for CO2 leakage detection, attribution and quantification monitoring exist. • Many approaches cover multiple monitoring tasks simultaneously. • Sonars and chemical sensors on ships or AUVs can cover large areas. • Newer, more specific technologies can detect, verify and quantify smaller, localised leaks. Environmental monitoring of offshore Carbon Capture and Storage (CCS) complexes requires robust methodologies and cost-effective tools to detect, attribute and quantify CO2 leakage in the unlikely event it occurs from a sub-seafloor reservoir. Various approaches can be utilised for environmental CCS monitoring, but their capabilities are often undemonstrated and more detailed monitoring strategies need to be developed. We tested and compared different approaches in an offshore setting using a CO2 release experiment conducted at 120 m water depth in the Central North Sea. Tests were carried out over a range of CO2 injection rates (6 - 143 kg d−1) comparable to emission rates observed from abandoned wells. Here, we discuss the benefits and challenges of the tested approaches and compare their relative cost, temporal and spatial resolution, technology readiness level and sensitivity to leakage. The individual approaches demonstrate a high level of sensitivity and certainty and cover a wide range of operational requirements. Additionally, we refer to a set of generic requirements for site-specific baseline surveys that will aid in the interpretation of the results. Critically, we show that the capability of most techniques to detect and quantify leakage exceeds the currently existing legal requirements.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Nutrient turnover by large sulfur bacteria on the Namibian mud belt during the low productivity season (2022)
    Frontiers
    Details
    Publication Date: 2024-02-07
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    Format: other
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 8
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    Nitrogen cycling in sediments on the NW African margin inferred from N and O isotopes in benthic chambers (2022)
    Frontiers
    Details
    Publication Date: 2024-02-07
    Description: Benthic nitrogen cycling in the Mauritanian upwelling region (NW Africa) was studied in June 2014 from the shelf to the upper slope where minimum bottom water O 2 concentrations of 25 µM were recorded. Benthic incubation chambers were deployed at 9 stations to measure fluxes of O 2 , dissolved inorganic carbon (DIC) and nutrients (NO 3 - , NO 2 - , NH 4 + , PO 4 3- , H 4 SiO 4 ) along with the N and O isotopic composition of nitrate (δ 15 N-NO 3 - and δ 18 O-NO 3 - ) and ammonium (δ 15 N-NH 4 + ). O 2 and DIC fluxes were similar to those measured during a previous campaign in 2011 whereas NH 4 + and PO 4 3- fluxes on the shelf were 2 – 3 times higher and possibly linked to a long-term decline in bottom water O 2 concentrations. The mean isotopic fractionation of NO 3 - uptake on the margin, inferred from the loss of NO 3 - inside the chambers, was 1.5 ± 0.4 ‰ for 15/14 N ( 15 ϵ app ) and 2.0 ± 0.5 ‰ for 18/16 O ( 18 ϵ app ). The mean 18 ϵ app : 15 ϵ app ratio on the shelf (〈 100 m) was 2.1 ± 0.3, and higher than the value of 1 expected for microbial NO 3 - reduction. The 15 ϵ app are similar to previously reported isotope effects for NO 3 - respiration in marine sediments but lower than determined in 2011 at a same site on the shelf. The sediments were also a source of 15 N-enriched NH 4 + (9.0 ± 0.7 ‰). A numerical model tuned to the benthic flux data and that specifically accounts for the efflux of 15 N-enriched NH 4 + from the seafloor, predicted a net benthic isotope effect of N loss ( 15 ϵ sed ) of 3.6 ‰; far above the more widely considered value of ~0‰. This result is further evidence that the assumption of a universally low or negligible benthic N isotope effect is not applicable to oxygen-deficient settings. The model further suggests that 18 ϵ app : 15 ϵ app trajectories > 1 in the benthic chambers are most likely due to aerobic ammonium oxidation and nitrite oxidation in surface sediments rather than anammox, in agreement with published observations in the water column of oxygen deficient regions.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    Particulate organic carbon export fluxes estimates by 234Th238U disequilibrium in the oxygen minimum zone off the Peruvian coast (2023)
    Elsevier
    Details
    Publication Date: 2024-02-07
    Description: The Peruvian upwelling zone is one of the most productive marine ecosystems in the world with a spectacular, pronounced oxygen minimum zone (OMZ). Globally OMZs are increasing in size and intensity with far-reaching consequences for the marine biological carbon pump and carbon export; thus, these zones need to be carefully monitored to be able to understand future climate change impacts. The current study was carried out in 2013 and 2017 to quantify the vertical flux of organic matter exported out of the productive surface layer by measuring 234Thsingle bond238U disequilibria in the water column. Samples were collected in January 2013 and May 2017 along an identical transect located at 12°S off the Peruvian coast near Lima, Peru. Th-234 fluxes ranged from 0 to 2088 ± 95 dpm m−2 d−1 in 2013 and 698 ± 63 to 3648 ± 113 dpm m−2 d−1 in 2017. The corresponding POC fluxes varied between 0 and 164.2 ± 7.9 mg C m−2 d−1 in 2013 and 22.7 ± 2.7 to 133.1 ± 15.2 mg C m−2 d−1 in 2017, with POC fluxes gradually decreasing with distance from the coast. Despite higher POC fluxes, the export efficiencies were found to be extremely low due to high particle remineralization rates observed within the euphotic zone.
    Type: Article , PeerReviewed
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 10
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    Climate-Biogeochemistry Interactions in the Tropical Ocean: Data collection and legacy (2021)
    Frontiers
    Details
    Publication Date: 2024-02-07
    Description: From 2008 through 2019, a comprehensive research project, SFB 754, Climate - Biogeochemistry Interactions in the Tropical Ocean, was funded by the German Research Foundation to investigate the climate-biogeochemistry interactions in the tropical ocean with a particular emphasis on the processes determining the oxygen distribution. During three 4-year long funding phases, a consortium of more than 150 scientists conducted or participated in 34 major research cruises and collected a wealth of physical, biological, chemical, and meteorological data. A common data policy agreed upon at the initiation of the project provided the basis for the open publication of all data. Here we provide an inventory of this unique data set and briefly summarize the various data acquisition and processing methods used.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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