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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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    GEOMAR CATALOGUE
    Link to Library Catalog
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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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    Potential effects of the exclusion of bottom fishing in the marine protected areas (MPAs) of the western Baltic Sea – third year observations. Cruise No. AL570, 22.03. – 11.04.2022, Kiel (Germany) – Kiel (Germany). MGF-OSTSEE-2022 (2022)
    GEOMAR Helmholtz Centre for Ocean Research
    Details
    Publication Date: 2024-04-24
    Description: The expedition AL570 with the RV Alkor was carried out within the framework of the interdisciplinary DAM MGF-OSTSEE Project “Potential effects of closure for bottom fishing in the marine protected areas (MPAs) of the western Baltic Sea – baseline observations” funded by the Ministry of Education and Research (BMBF). Within MGF-OSTSEE a consortium of scientists from various institutions investigates how benthic ecosystems in Natura 2000 areas within the German exclusive economic zone develop after the exclusion of bottom trawling. Major goals of the project are i. the initial assessment of the environmental state and its variability in- and outside the three Natura 2000 areas Fehmarnbelt, Oder- and Rönnebank under the ongoing pressure of bottom trawling and ii. the general assessment of the effect of bottom trawling on benthic communities and benthic biogeochemical functioning as well as their development after fishery exclusion. The cruise AL570 concludes a series of three previous expeditions EMB238 (2020) and EMB267/268 (2021) and aimed to survey all components of the benthic food web including prokaryotes, protozoans, meiofauna and macrofauna, as well as sediment properties and biogeochemical processes in selected working areas in- and outside of the MPA. The working program comprised 156 station activities of various gears for biological and biogeochemical sampling of sediments. Solute exchange between the sediment and the water column was investigated using Landers and a novel underwater vehicle the Deep-Sea Rover (DSR) Panta Rhei. Investigations in the water column, seafloor observation and deployments of a dredge supplemented the station work. Due to stormy weather in situ solute fluxe measurements were not performed at the Rönnebank.
    Type: Report , NonPeerReviewed
    Format: text
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    OceanRep: Report - Cruise Report
  • 4
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    Modelling mass accumulation rates and 210Pb rain rates in the Skagerrak: lateral sediment transport dominates the sediment input (2024)
    Frontiers
    Details
    Publication Date: 2024-04-03
    Description: Sediment fluxes to the seafloor govern the fate of elements and compounds in the ocean and serve as a prerequisite for research on elemental cycling, benthic processes and sediment management strategies. To quantify these fluxes over seafloor areas, it is necessary to scale up sediment mass accumulation rates (MAR) obtained from multiple sample stations. Conventional methods for spatial upscaling involve averaging of data or spatial interpolation. However, these approaches may not be sufficiently precise to account for spatial variations of MAR, leading to poorly constrained regional sediment budgets. Here, we utilize a machine learning approach to scale up porosity and 210 Pb data from 145 and 65 stations, respectively, in the Skagerrak. The models predict the spatial distributions by considering several predictor variables that are assumed to control porosity and 210 Pb rain rates. The spatial distribution of MAR is based on the predicted porosity and existing sedimentation rate data. Our findings reveal highest MAR and 210 Pb rain rates to occur in two parallel belt structures that align with the general circulation pattern in the Skagerrak. While high 210 Pb rain rates occur in intermediate water depths, the belt of high MAR is situated closer to the coastlines due to lower porosities at shallow water depths. Based on the spatial distributions, we calculate a total MAR of 34.7 Mt yr -1 and a 210 Pb rain rate of 4.7 · 10 14 dpm yr -1 . By comparing atmospheric to total 210 Pb rain rates, we further estimate that 24% of the 210 Pb originates from the local atmospheric input, with the remaining 76% being transported laterally into the Skagerrak. The updated MAR in the Skagerrak is combined with literature data on other major sediment sources and sinks to present a tentative sediment budget for the North Sea, which reveals an imbalance with sediment outputs exceeding the inputs. Substantial uncertainties in the revised Skagerrak MAR and the literature data might close this imbalance. However, we further hypothesize that previous estimates of suspended sediment inputs into the North Sea might have been underestimated, considering recently revised and elevated estimates on coastal erosion rates in the surrounding region of the North Sea.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Alkaline mineral addition to anoxic to hypoxic Baltic Sea sediments as a potentially efficient CO2-removal technique (2024)
    Frontiers
    Details
    Publication Date: 2024-02-28
    Description: Recent studies have begun to explore the potential of enhanced benthic weathering (EBW) in the Baltic Sea as a measure for climate change mitigation. To augment the understanding of EBW under seasonally changing conditions, this study aims to investigate weathering processes under anoxia to hypoxia in corrosive bottom waters, which reflect late summer conditions in the Baltic Sea. Dunite and calcite were added to sediment cores retrieved from Eckernförde Bay (Western Baltic Sea) with a constant flow-through of deoxygenated, CO 2 -enriched Baltic Sea bottom water. The addition of both materials increased benthic alkalinity release by 2.94 μmol cm −2 d −1 (calcite) and 1.12 μmol cm −2 d −1 (dunite), compared to the unamended control experiment. These excess fluxes are significantly higher than those obtained under winter conditions. The comparison with bottom water oxygen concentrations emphasizes that highest fluxes of alkalinity were associated with anoxic phases of the experiment. An increase in Ca and Si fluxes showed that the enhanced alkalinity fluxes could be attributed to calcite and dunite weathering. First order rate constants calculated based on these data were close to rates published in previous studies conducted under different conditions. This highlights the suitability of these proxies for mineral dissolution and justifies the use of these rate constants in modeling studies investigating EBW in the Baltic Sea and areas with similar chemical conditions. Generally stable pH profiles over the course of the experiment, together with the fact that the added minerals remained on the sediment surface, suggest that corrosive bottom waters were the main driving factor for the dissolution of the added minerals. These factors have important implications for the choice of mineral and timing for EBW as a possible marine carbon dioxide removal method in seasonally hypoxic to anoxic regions of the Baltic Sea.
    Type: Article , PeerReviewed
    Format: text
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    2. Wochenbericht FS MARIA S. MERIAN - MSM114 (2023)
    GEOMAR Helmholtz Zentrum für Ozeanforschung Kiel
    Details
    Publication Date: 2023-01-24
    Description: FS MARIA S. MERIAN - MSM114, Las Palmas - Mindelo, 16. - 21. Januar 2023 „MOSES Eddy Study IV“
    Type: Report , NonPeerReviewed
    Format: text
    Format: text
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    OceanRep: Report - Weekly report
  • 7
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    1. Wochenbericht FS MARIA S. MERIAN - MSM114 (2023)
    GEOMAR Helmholtz Zentrum für Ozeanforschung Kiel
    Details
    Publication Date: 2023-01-16
    Description: FS MARIA S. MERIAN - MSM114, Las Palmas - Mindelo, 15. - 21. Januar 2023 „MOSES Eddy Study IV“
    Type: Report , NonPeerReviewed
    Format: text
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Report - Weekly report
  • 8
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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
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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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
  • 10
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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
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