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  • 2020-2024  (7)
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  • 1
    Online Resource
    Online Resource
    Mixed-Valence Systems : Fundamentals, Synthesis, Electron Transfer, and Applications. (2023)
    Newark :John Wiley & Sons, Incorporated,
    Details
    Keywords: Valence (Theoretical chemistry). ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (515 pages)
    Edition: 1st ed.
    ISBN: 9783527835263
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=7209555
    DDC: 547.1224
    Language: English
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    GEOMAR EBL
  • 2
    Online Resource
    Online Resource
    Matrix Discrete Element Analysis of Geological and Geotechnical Engineering (2021)
    Singapore : Springer Singapore | Singapore : Imprint: Springer
    Details Availability
    Keywords: Geotechnical engineering. ; Engineering geology. ; Engineering—Geology. ; Foundations. ; Hydraulics. ; Computer-aided engineering. ; Angewandte Mathematik ; Computersimulation ; Diskrete-Elemente-Methode ; Modellierung ; Bodenmechanik ; Rutschung ; Ingenieurgeologie ; Geomechanik ; Dreidimensionales Modell
    Description / Table of Contents: Chapter 1 Principles and Implementation of DEM -- Chapter 2 The Basic Structure of MatDEM -- Chapter 3 Geometric Modeling and Material Setup -- Chapter 4 Load Settings and Numerical Calculations -- Chapter 5 Postprocessing and System Functions -- Chapter 6 Basic Application of Geotechnical Engineering -- Chapter 7 Rock-Soil Body Discrete Element Test -- Chapter 8 Modeling of Complex 3D Models -- Chapter 9 Numerical Simulations of Dynamic Action -- Chapter 10 Multi-field Coupled Numerical Simulation -- Appendix Properties, Functions and Frequently Asked Questions.
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource(XXIII, 294 p. 349 illus., 117 illus. in color.)
    Edition: 1st ed. 2021.
    ISBN: 9789813345249
    Series Statement: Springer eBook Collection
    URL: https://doi.org/10.1007/978-981-33-4524-9
    DOI: 10.1007/978-981-33-4524-9
    Language: English
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    GEOMAR CATALOGUE
    Link to Library Catalog
    get availability status
  • 3
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    Seawater carbonate chemistry and the production of DMSP and DMS in the culture of Amphidinium carterae (2020)
    PANGAEA
    Details
    Publication Date: 2024-03-15
    Description: Ocean acidification and global warming might affect the production of dimethylsulfoniopropionate (DMSP), dimethylsulfide (DMS), and dissolved acrylic acid (AAd) by marine phytoplankton. Monoculture incubation experiments were conducted with the dinoflagellate Amphidinium carterae to investigate the effects of elevated CO2 concentration and temperature on growth and productions of DMSP, DMS, and AAd. Two pCO2 levels were set as 400 and 1000 μatm, and two temperatures were set as 20 and 23 °C. The growth of A. carterae remained unaffected by an increase of CO2 to 1000 μatm and a rise of temperature of 3 °C. Moreover, the elevated CO2 concentration and temperature had no significant effects on the concentrations and cell-normalized concentrations of DMSP, DMS, and AAd. No additive or synergistic effects of elevated CO2 concentration and temperature on A. carterae were observed, indicating that A. carterae was insensitive to elevated CO2 and temperature in short time incubation.
    Keywords: Acrylic acid, dissolved; Acrylic acid, dissolved, standard deviation; Acrylic acid, dissolved per cell; Acrylic acid, dissolved per cell, standard deviation; Alkalinity, total; Amphidinium carterae; Aragonite saturation state; Bicarbonate ion; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Cell density; Cell density, standard deviation; Chromista; Dimethyl sulfide; Dimethyl sulfide, standard deviation; Dimethyl sulfide per cell; Dimethyl sulfide per cell, standard deviation; Dimethylsulfoniopropionate, dissolved; Dimethylsulfoniopropionate, dissolved, per cell; Dimethylsulfoniopropionate, dissolved, per cell, standard deviation; Dimethylsulfoniopropionate, dissolved, standard deviation; Dimethylsulfoniopropionate, particulate; Dimethylsulfoniopropionate, particulate, per cell; Dimethylsulfoniopropionate, particulate, per cell, standard deviation; Dimethylsulfoniopropionate, particulate, standard deviation; Experiment duration; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Laboratory experiment; Laboratory strains; Myzozoa; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Other metabolic rates; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; pH; Phytoplankton; Registration number of species; Salinity; Single species; Species; Temperature; Temperature, water; Treatment; Type; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 1120 data points
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    DATA PANGAEA
  • 4
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    Photoproduction of nitric oxide in seawater (2020)
    Copernicus Publications (EGU)
    Details
    Publication Date: 2023-02-08
    Description: Nitric oxide (NO) is a short-lived intermediate of the oceanic nitrogen cycle. However, our knowledge about its production and consumption pathways in oceanic environments is rudimentary. In order to decipher the major factors affecting NO photochemical production, we irradiated several artificial seawater samples as well as 31 natural surface seawater samples in laboratory experiments. The seawater samples were collected during a cruise to the western tropical North Pacific Ocean (WTNP, a N-S section from 36 to 2 degrees N along 146 to 143 degrees E with 6 and 12 stations, respectively, and a W-E section from 137 to 161 degrees E along the Equator with 13 stations) from November 2015 to January 2016. NO photoproduction rates from dissolved nitrite in artificial seawater showed increasing trends with decreasing pH, increasing temperature, and increasing salinity. In contrast, NO photoproduction rates (average: 0.5 +/- 0.2 x 10(-12) mol L-1 s(-1)) in the natural seawater samples from the WTNP did not show any correlations with pH, water temperature, salinity, or dissolved inorganic nitrite concentrations. The flux induced by NO photoproduction in the WTNP (average: 13 x 10(-12) mol M-2 S-1) was significantly larger than the NO air-sea flux density (average: 1.8 x 10(-12) Mol M-2 S-1), indicating a further NO loss process in the surface layer.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Emissions of Nitric Oxide from Photochemical and Microbial Processes in Coastal Waters of the Yellow and East China Seas (2023)
    ACS (American Chemical Society)
    Details
    Publication Date: 2024-02-07
    Description: Nitric oxide (NO) is an atmospheric pollutant and climate forcer as well as a key intermediary in the marine nitrogen cycle, but the ocean’s NO contribution and production mechanisms remain unclear. Here, high-resolution NO observations were conducted simultaneously in the surface ocean and the lower atmosphere of the Yellow Sea and the East China Sea; moreover, NO production from photolysis and microbial processes was analyzed. The NO sea–air exchange showed uneven distributions (RSD = 349.1%) with an average flux of 5.3 ± 18.5 × 10–17 mol cm–2 s–1. In coastal waters where nitrite photolysis was the predominant source (89.0%), NO concentrations were remarkably higher (84.7%) than the overall average of the study area. The NO from archaeal nitrification accounted for 52.8% of all microbial production (11.0%). We also examined the relationship between gaseous NO and ozone which helped identify sources of atmospheric NO. The sea-to-air flux of NO in coastal waters was narrowed by contaminated air with elevated NO concentrations. These findings indicate that the emissions of NO from coastal waters, mainly controlled by reactive nitrogen inputs, will increase with the reduced terrestrial NO discharge.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    The influence of river-derived particles on estuarine and marine elemental cycles: Evidence from lithium isotopes (2023)
    Elsevier
    Details
    Publication Date: 2024-02-07
    Description: To examine the alteration of river-derived sediments through a large estuary and the implications for elemental cycling and global climate, this study analyses lithium (Li) isotopes and elemental concentrations (e.g., Li, Na, Mg, K, Ca, Fe and Al) of both the dissolved load and different phases of the sediment load (i.e., exchangeable, carbonate, oxide, clay and residue) in the Amazon estuary. The results show that river-derived sediments remove Li from the dissolved load, largely due to cation retention in secondary clays. By modelling the Li mass-balance and isotope fractionation, we estimate that the river-derived sediments gain 3–4 μg/g Li from the dissolved load in the Amazon estuary, with a Li isotope fractionation factor (αclay-solution) of approximately 0.975. Considering the whole Amazon estuary, the river-derived sediments remove around 3.6–4.8 × 109 g/yr of Li from the dissolved load. Specifically, around 1.0–1.7 × 108 g/yr of Li is removed from river water (∼1.8–3.0% of the dissolved Li discharge flux of the Amazon River) and around 3.5–4.7 × 109 g/yr of Li is removed from seawater, which represents a significant sink from the ocean. This estuarine Li sink is likely to be related to continental erosion rates; thus, continental weathering and erosion regimes could influence not only riverine Li input, but could also directly affect the Li sink, leading to a dual control on the Li budget and isotope composition in the ocean.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: other
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    Continuous Chemiluminescence Measurements of Dissolved Nitric Oxide (NO) and Nitrogen Dioxide (NO2) in the Ocean Surface Layer of the East China Sea (2021)
    ACS (American Chemical Society)
    Details
    Publication Date: 2024-02-07
    Description: Nitric oxide (NO) is a short-lived intermediate of the oceanic nitrogen cycle, and it is produced by biological and photochemical processes in the ocean. Nitrogen dioxide (NO2) is a reactive atmospheric compound which has not been determined in the ocean so far. Here, we present the setup and validation of a novel continuous underway measurement system to measure dissolved NO and NO2 in the surface ocean. The system consists of a seawater/gas equilibration component coupled to a chemiluminescence detector. It was successfully deployed during a 12 day cruise to the East China Sea in May 2018. Dissolved NO and NO2 surface concentrations ranged from 〈limit of detection (LOD) to 98 × 10-12 mol L-1 and 〈LOD to 83 × 10-12 mol L-1, respectively. The ECS was supersaturated with NO but significantly undersaturated with NO2, indicating that the surface waters were a source for atmospheric NO but a sink for atmospheric NO2 at the time of our measurements.
    Type: Article , PeerReviewed
    Format: text
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