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  • English  (2)
  • German  (1)
  • 2020-2023  (3)
  • 1975-1979
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  • English  (2)
  • German  (1)
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  • 1
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    Sources and Fate of the Antiandrogenic Fluorescent Dye 4‐Methyl‐7‐Diethylaminocoumarin in Small River Systems (2021)
    Details
    Publication Date: 2022-04-05
    Description: Recently, the potent antiandrogen 4‐methyl‐7‐diethylaminocoumarin (C47) and its potential transformation products 4‐methyl‐7‐ethylaminocoumarin (C47T1) and 4‐methyl‐7‐aminocoumarin (C47T2) were identified as novel environmental contaminants. We assessed for the first time the sources, distribution, and fate of these compounds in aquatic systems using the Holtemme River (Saxony‐Anhalt, Germany), which is a hotspot for these contaminants. To this end, wastewater‐treatment plant (WWTP) influent and effluent samples, surface water samples over 3 years, and the longitudinal profiles in water, sediment, and gammarids were analyzed. From the longitudinal profile of the river stretch, the WWTP of Silstedt was identified as the sole point source for these compounds in the River Holtemme, and exposure concentrations in the low micrograms per liter range could be recorded continuously over 3 years. Analysis of WWTP influent and effluent showed a transformation of approximately half of the C47 into C47T1 and C47T2 but no complete removal. A further attenuation of the three coumarins after discharge into the river could be largely attributed to dilution, while transformation was only approximately 20%, thus suggesting a significant persistence in aquatic systems. Experimentally derived partitioning coefficients between water and sediment organic carbon exceeded those predicted using the OPERA quantitative structure–activity relationship tools and polyparameter linear free‐energy relationships by up to 93‐fold, suggesting cation binding as a significant factor for their sorption behavior. Near‐equilibrium conditions between water and sediment were not observed close to the emitting WWTP but farther downstream in the river. Experimental and predicted bioaccumulation factors for gammarids were closely matching, and the concentrations in field‐sampled gammarids were close to steady state with exposure concentrations in the water phase of the river. Environ Toxicol Chem 2021;40:3078–3091. © 2021 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC.
    Description: Helmholtz‐Gemeinschaft http://dx.doi.org/10.13039/501100001656
    Description: Bundesministerium für Bildung und Forschung http://dx.doi.org/10.13039/501100002347
    Keywords: ddc:577.614
    Language: English
    Type: doc-type:article
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  • 2
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    Qualitative und quantitative petrographische Untersuchungen der Kohlen aus den flözführenden Schichten der Antioquia-Formation/Kolumbien (2022)
    In:  Herausgeberexemplar
    Details
    Publication Date: 2022-01-13
    Description: Es wurde eine geologische Obersicht der Amaga-Mulde aufgestellt, wobei die kohlenführende Antioquia-Formation besonders behandelt wurde. Die Ergebnisse wurden in einer geologischen und einer tektonischen Karte sowie in Profilen im Maßstab 1 : 50 000 dargestellt. Aus der Amaga-Mulde wurden acht Flözprofiläulen kohlenpetrographisch analysiert. Die makropetrographischen Analysen nach Lithotypen ergaben, daß die Flöze arm an Verwachsungen von Kohle mit Nebengesteinen sind, daß der Lithotyp Fusain fehlt und daß die Kohlen vorwiegend feinstreifig aufgebaut sind. Die qualitativen mikroskopischen Untersuchungen zeigten, daß die Macerale und die Mineralführung wie auch die Vergesellschaftung der Macerale untereinander ähnlich sind. Durch die Kombinationsanalysen wurde die Zusammensetzung der Lithotypen nach Maceralen, Maceralgruppen, Mikrolithotypen und die Zusammensetzung der Mikrolithotypen nach Maceralen ermittelt. Die Maceralgruppenuntersuchungen ergaben, daß die Flöze überwiegend aus Vitriniten aufgebaut und ungewöhnlich arm an Inertiniten sind. Durch die Untersuchungen der einzelnen Lithotypen konnte nachgewiesen werden, daß zwischen den makroskopisch unterschiedenen Lithotypen Durain und Clarain kein eindeutiger Unterschied besteht. Beide Lithotypen sind mehr oder weniger nur aus Vergesellschaftungen von Vitriniten und Exiniten aufgebaut. Insgesamt sind die Schwankungen in der petrographischen Zusammensetzung der Lithotypen aller Flöze so klein, daß, ausgehend von dem makroskopischen Flözschnitt, Rückschlüsse auf die Zusammensetzung der Kohle möglich sind. Es wurden Schlitzproben der Amaga-Mulde untersucht und die Ergebnisse mit den Untersuchungsbefunden der Schlitzproben der Titiribi-Bolombolo-Senke verglichen. Bis auf wenige Ausnahmen sind die Flöze der Titiribi-Bolombolo-Senke höher inkohlt als die der Amaga-Mulde; bei einigen Flözen wird der Inkohlungsgrad von Magerkohlen und Anthraziten erreicht. Diese Kohlen liegen in unmittelbarer Nachbarschaft von vulkanischen Extrusionen. Der hohe Inkohlungsgrad ist auf eine Kontaktmetamorphose zurückzuführen.
    Description: thesis
    Description: DFG, SUB Göttingen
    Keywords: 553.24 ; Kolumbien {Geologie} ; Südamerika {Fossile Energieträger} ; Prospektion {Kohlelagerstätten} ; FID-GEO-DE-7
    Language: German
    Type: map
    Format: 110
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  • 3
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    Synoptic circulation changes over Central Europe from 1900 to 2100: Reanalyses and Coupled Model Intercomparison Project phase 6 (2021)
    John Wiley & Sons, Ltd. | Chichester, UK
    Details
    Publication Date: 2022-09-27
    Description: While the evidence for anthropogenic climate change continues to strengthen, and concerns about severe weather events are increasing, global projections of regional climate change are still uncertain due to model‐dependent changes in large‐scale atmospheric circulation, including over North Atlantic and Europe. Here, the Jenkinson–Collison classification of daily circulation patterns is used to evaluate past and future changes in their seasonal frequencies over Central Europe for the 1900–2100 period. Three reanalyses and eight global climate models from the Coupled Model Intercomparison Project phase 6, were used based on daily mean sea‐level pressure data. Best agreement in deriving relative frequencies of the synoptic types was found between the reanalyses. Global models can generally capture the interannual variability of circulation patterns and their climatological state, especially for the less frequent synoptic types. Based on historical data and the shared socioeconomic pathway 5 scenario, the evaluated trends show more robust signals during summer, given their lesser internal variability. Increasing frequencies were found for circulation types characterized by weak pressure gradients, mainly at the expense of decreasing frequencies of westerlies. Our findings indicate that given a high‐emission scenario, these signals will likely emerge from past climate variability towards the mid‐21st century for most altered circulation patterns.
    Description: Daily synoptic circulation patterns are derived using the Jenkinson–Collinson automated classification over Central Europe to evaluate past and future changes in their temporal frequencies. Reanalyses and eight global climate models from the CMIP6 were used based on the historical experiment and a high‐emission scenario. More robust signals were found during the summer season leading to emerging changes towards the mid‐21st century.
    Description: H2020 Marie Skłodowska‐Curie Actions http://dx.doi.org/10.13039/100010665
    Description: EU International Training Network (ITN) Climate Advanced Forecasting of sub‐seasonal Extremes (CAFE)
    Keywords: ddc:551.6
    Language: English
    Type: doc-type:article
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