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  • Other Sources  (80,488)
  • 2020-2024  (8,164)
  • 1985-1989  (67,623)
  • 1950-1954  (4,701)
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  • 1
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    Geologische und geomagnetische Untersuchungen am Pfahlberg, einem quartärenVulkan im rechtsrheinischen Schiefergebirge (1989)
    Details
    Publication Date: 2024-06-25
    Description: Die Verbreitung der basaltischen Gesteine im Bereich des Pfahlberges wurde geologisch kartiert. Die verschiedenen Gesteinstypen werden detailliert beschrieben. Die geomagnetische Untersuchung des basaltischen Körpers wird an Hand von 7 Profilen erläutert. Mit Hilfe der Geomagnetik wurden einerseits die Ergebnisse der geologischen Kartierung bestätigt, zum anderen konnte eine Fortsetzung des Basaltes unter jüngerer Löß- und Bimsbedeckung nachgewiesen werden. Die Genese des Pfahlberges wird diskutiert. Der Basalt ist vermutlich vorwiegend als Lavastrom ausgetreten. Teilweise ist er lagergangartig zwischen seinen Tuff und das devonische Grundgebirge eingedrungen.
    Description: Abstract: The distribution of the basaltic rocks within the region of the Pfahlberg was mapped geologically. The different rock types are described in detail. The geomagnetical investigation of the basaltic knob is illustrated by seven cross-sections. By support of the geomagnetics the results of the geological mapping are verified. It was also possible to prove the continuation of the basalt below the younger cover of loess and pumice. The genesis of the Pfahlberg is discussed. Probably the basalt is especially flown out as a lava river. Partly it is intruded dikelike between its tuff and the devonian basement.
    Description: 1. Einleitung 2. Lage und Morphologie des Pfahlberges 3. Geologischer Überblick 4. Vulkanismus im Westerwald 5. Basaltvorkommen des Pfahlberges 5.1. Pyroklastische Gesteine 5.2. Basalt-Gesteine 6. Geomagnetische Untersuchungen6 7. Genese des Pfahlberges
    Description: research
    Keywords: ddc:554.3 ; Rheinisches Schiefergebirge ; Westerwald ; TK 5511 ; Geomagnetik ; Vulkanismus ; Quartär
    Language: German
    Type: doc-type:article , publishedVersion
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    CITATION GEO-LEO
  • 2
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    Die Makrofloren des saarpfälzischen Rotliegenden (? Ober-Karbon - Unter-Perm; SW-Deutschland) (1985)
    Details
    Publication Date: 2024-06-25
    Description: Ein kurzer Abriß der paläobotanischen Forschungsgeschichte des saarpfälzischen Rotliegenden wird gegeben; ein Überblick über ältere Bestandsaufnahmen saarpfälzischer Rotliegendfloren schließt sich an. Einige der von Weiss (1868, 1869 bis 1872) und Florin (1938-1945) angegebenen Fundorte wurden in die von Boy & Fichter (1982) publizierte neue lithostratigraphische Gliederung des saarpfälzischen Rotliegenden eingestuft; ihre Floreninhalte sind aufgelistet. Sämtliche den Verfassern bekannte bzw. bekannnt gewordenen, heute noch zugänglichen Pflanzenlagerstätten sind ebenfalls in das Schema von Boy & Fichter (1982) stratigraphisch eingestuft worden, und ihre Floreninhalte sind in Tabellen angegeben. Zusätzlich wird eine aktualisierte Florenliste zu der (seit längerem bearbeiteten) Lokalität Sobernheim geliefert. Im Tafelteil werden die wichtigsten Florenelemente des saarpfälzischen Rotliegenden abgebildet, der Begleittext behandelt Fragen der Taxonomie und Nomenklatur.
    Description: Abstract: The history of palaeobotanical investigations on the Rotliegendes of the Saar-Nahe area is briefly summarized. A review of previous inventories is given. A new lithostratigraphical subdivision of the Rotliegendes of the Saar-Nahe area was published by Boy & Fichter (1982). The stratigraphical positions of some of the localities mentioned by Weiss (1868, 1869-1872) and Florin (1938-1945) could be determined within this scheme. Their floral content is listed on tables. The occurrences of plant remains in a large number of localities, distributed over several lithostratigraphical units, are shown on tables. All the plant localities known to the authors, most of them still being accessible, are included. An updated list of the plant taxa of the locality Sobernheim is given separately. The most characteristic plant taxa are illustrated, some remarks on problems on taxonomy and nomenclature are included.
    Description: 1. Einleitung 2. Zur Geschichte der paläobotanischen Forschung im saarpfälzischen Rotliegenden 3. Altere Bestandsaufnahmen saarpfälzischer Rotliegendfloren 4. Bemerkungen zu den Fundorten und Fundschichten 5. Stratigraphische und geographische Verbreitung der saarpfälzischen Rotliegendfloren 5.1. Unterrotliegendes 5.2. Oberrotliegendes Tabellen 1-19 Schriften Verzeichnis der Tafeln Tafeln 1-42
    Description: research
    Keywords: ddc:561 ; Rotliegend ; Saar-Nahe-Becken ; Paläobotanik
    Language: German
    Type: doc-type:article , publishedVersion
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    CITATION GEO-LEO
  • 3
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    Ostsee aus der Schnorchelsicht (2024)
    Details
    Publication Date: 2024-06-25
    Description: Meeresschutz in nächster Nähe: Ein Pilotprojekt soll Schulklassen für ihre Umwelt sensibilisieren
    Type: Newspaper report , NonPeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 4
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    Zeitbomben am Meeresgrund (2024)
    Details
    Publication Date: 2024-06-25
    Description: Forscher von Geomar untersuchen Weltkriegsmunition in der Ostsee - Sie ist vielfältiger als gedacht
    Type: Newspaper report , NonPeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 5
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    Visual 3D Reconstruction in the Deep Sea : from Geometric and Radiometric Perspectives (2024)
    Details
    Publication Date: 2024-06-25
    Description: Underwater vision systems have become popular in ocean research. However, imaging in the deep sea poses significant challenges. Firstly, cameras enclosed in waterproof housings must withstand extreme water pressure, while light undergoes refraction as it traverses multiple media layers. Secondly, light absorption and scattering in water degrade image quality. Additionally, artificial illumination in the deep sea creates unique visual effects. All these factors collectively contribute to the complexity and difficulty of visual 3D reconstruction in the deep sea. This dissertation provides comprehensive solutions to the challenges encountered in deep sea visual 3D reconstruction, encompassing both hardware and software components. To address geometric refraction effects, it thoroughly analyzes dome refractive geometry and proposes mechanical adjustments for centering cameras inside domes to mitigate refraction effects. Additionally, recognizing the wide use of flat port interfaces, the dissertation explores effective methods to correct flat refraction effects for underwater photogrammetry. Furthermore, the dissertation delves into radiometric issues arising from light absorption and scattering in water, especially concerning artificial illumination in deep-sea imaging. It explores physical models of underwater image formation and develops a general model suitable for restoring various types of underwater image, especially in environments with complex artificial illumination. This model enables the simultaneous removal of artificial lighting patterns and the restoration of true colors. Moreover, the dissertation demonstrates several successful applications of the techniques developed within its scope. It showcases their efficacy in various camera system designs, underwater 3D reconstruction, and improving complex illumination configurations within imaging systems.
    Type: Thesis , NonPeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 6
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    3. Wochenbericht MSM129/2 (2024)
    GEOMAR
    Details
    Publication Date: 2024-06-25
    Description: FS Maria S Merian – MSM129/2 07.06.2024 – 06.07.2024 St. John’s (Kanada) – Reykjavik (Island) 3. Wochenbericht (17.06. – 23.06.2024)
    Type: Report , NonPeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 7
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    Long-term culture system for deep-sea mussels Gigantidas childressi (2024)
    ASLO (Association for the Sciences of Limnology and Oceanography) | Wiley
    Details
    Publication Date: 2024-06-24
    Description: The simulation of deep-sea conditions in laboratories is technically challenging but necessary for experiments that aim at a deeper understanding of physiological mechanisms or host-symbiont interactions of deep-sea organisms. In a proof-of-concept study, we designed a recirculating system for long-term culture (〉2 yr) of deep-sea mussels Gigantidas childressi (previously Bathymodiolus childressi). Mussels were automatically (and safely) supplied with a maximum stable level of ~60 μmol L−1 methane in seawater using a novel methane–air mixing system. Experimental animals also received daily doses of live microalgae. Condition indices of cultured G. childressi remained high over the years, and low shell growth rates could be detected, too, which is indicative of positive energy budgets. Using stable isotope data, we demonstrate that G. childressi in our culture system gained energy, both, from the digestion of methane-oxidizing endosymbionts and from digesting particulate food (microalgae). Limitations of the system, as well as opportunities for future experimental approaches involving deep-sea mussels, are discussed.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
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    PAPER (OCEANREP)
  • 8
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    Introduction to special issue on seabed prospecting technology (2024)
    Wiley
    Details
    Publication Date: 2024-06-24
    Type: Article , PeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 9
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    Zooplankton seasonal vertical migration in an optimality-based plankton ecosystem model (2024)
    Oxford University Press
    Details
    Publication Date: 2024-06-24
    Description: Several species from various zooplankton taxa perform seasonal vertical migrations (SVM) of typically several hundred meters between the surface layer and overwintering depths, particularly in high-latitude regions. We use OPtimality-based PLAnkton (OPPLA) ecosystem model) to simulate SVM behavior in zooplankton in the Labrador Sea. Zooplankton in OPPLA is a generic functional group without life cycle, which facilitates analyzing SVM evolutionary stability and interactions between SVM and the plankton ecosystem. A sensitivity analysis of SVM-related parameters reveals that SVM can amplify the seasonal variations of phytoplankton and zooplankton and enhance the reduction of summer surface nutrient concentrations. SVM is often explained as a strategy to reduce exposure to visual predators during winter. We find that species doing SVM can persist and even dominate the summer-time zooplankton community, even in the presence of Stayers, which have the same traits as the migrators, but do not perform SVM. The advantage of SVM depends strongly on the timing of the seasonal migrations, particularly the day of ascent. The presence of higher (visual) predators tends to suppress the Stayers in our simulations, whereas the SVM strategy can persist in the presence of non-migrating species even without higher predators.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
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    PAPER (OCEANREP)
  • 10
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    Regional Variation in Extratropical North Atlantic Air‐Sea Interaction 1960–2020 (2024)
    AGU (American Geophysical Union) | Wiley
    Details
    Publication Date: 2024-06-24
    Description: Air-sea interaction in late boreal winter is studied over the extratropical North Atlantic (NA) during 1960–2020 by examining the relationship between sea-surface temperature (SST) and total turbulent heat flux (THF). The two quantities are positively correlated on interannual timescales over the central-midlatitude and subpolar NA, suggesting the atmosphere on average drives SST and THF variability is independent of SST. On decadal timescales and over the central-midlatitude NA the correlation is negative, suggesting ocean processes on average drive SST and THF variability is sensitive to SST. The correlation is positive over the subpolar NA. There, interannual and decadal THF variability is governed by the North Atlantic Oscillation (NAO). During the major late 20th and early 21st century SST increase in the subpolar NA diminishing oceanic heat loss associated with a weakening NAO was observed. This study suggests that the atmosphere is more sensitive to SST over the central-midlatitude than subpolar NA. Key Points: - Regional variation in the nature of air-sea interaction over the extratropical North Atlantic (NA) north of 35°N - Timescale dependence in relationship between sea-surface temperature (SST) and turbulent heat flux over the central-midlatitude NA - The atmosphere is more sensitive to SST variability over the central-midlatitude than subpolar NA
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
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