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  • Center for Marine Environmental Sciences; MARUM  (6)
  • Hochschulschrift  (4)
  • 11; Abyssogena soutwardae, height of valve; Abyssogena soutwardae, height of valve/length of valve ratio; Abyssogena soutwardae, length of fibrous ligament/length of posterior lamellar ligament ratio; Abyssogena soutwardae, length of fibrous ligament/length of valve ratio; Abyssogena soutwardae, length of fibrous part of ligament; Abyssogena soutwardae, length of posterior lamellar ligament/length of valve; Abyssogena soutwardae, length of posterior lamellar part of ligament; Abyssogena soutwardae, length of valve; Abyssogena soutwardae, position of umbo; Abyssogena soutwardae, width of valve; Abyssogena soutwardae, width of valve/length of valve ratio; Advance_II_11; Akademik Mstislav Keldysh; ALVIN; AMK41; AMK41-3869-1; Anyas Garden, Logatchev area; AT_3133; Barbados; BARESNAUT_Pl_94; Calculated; Center for Marine Environmental Sciences; Comment; Elevation of event; Event label; HYDROMAR1; Latitude of event; Logachev Hydrothermal Field, diffusive field; Longitude of event; M60/3; M60/3-66-ROV; M66/1; M66/1_395; MARUM; Measured using callipers; Meteor (1986); Mid-Atlantic Ridge at 10-15°N; MIR; MIR deep-sea manned submersible; offshore Virginia; off the Canary Archipelago, Henry Seamount; Remote operated vehicle; ROV; Submersible Alvin; Type  (1)
  • 123; 134; Calculated; Calyptogena makranensis, height of valve; Calyptogena makranensis, height of valve/length of valve ratio; Calyptogena makranensis, length of fibrous ligament; Calyptogena makranensis, length of fibrous ligament/length of posterior lamellar ligament; Calyptogena makranensis, length of fibrous ligament/length of valve ratio; Calyptogena makranensis, length of posterior lamellar ligament; Calyptogena makranensis, length of posterior lamellar ligament/length of valve; Calyptogena makranensis, length of valve; Calyptogena makranensis, position of umbo; Calyptogena makranensis, width of valve; Calyptogena makranensis, width of valve/length of valve ratio; Center for Marine Environmental Sciences; Elevation of event; Event label; Latitude of event; Longitude of event; M54/3A; M54/3A_123; M54/3A_134; MARUM; Measured using callipers; Meteor (1986); Television-Grab; TVG; Type  (1)
Publikationsart
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  • 1
    Buch
    Buch
    Untersuchungen an cold seep assoziierten Organismen im NE-Pazifik (1997)
    Kiel : Forschungszentrum für marine Geowissenschaften der Christian-Albrechts-Univ.
    Details Verfügbarkeit
    Schlagwort(e): Diplomarbeit ; Hochschulschrift
    Materialart: Buch
    Seiten: 89, VII S , Ill., graph. Darst., Kt
    Sprache: Deutsch
    Anmerkung: Kiel, Univ., Diplomarbeit, 1997
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Buch
    Buch
    The influence of hydrogen sulfide on the benthic community structure at cold seeps and interactions between the cold-seep and deep-sea ecosystems : three case studies (2001)
    Details Verfügbarkeit
    Schlagwort(e): Dissertation ; Hochschulschrift
    Materialart: Buch
    Seiten: 85 S , Ill., graph. Darst., Kt
    Sprache: Englisch
    Anmerkung: Kiel, Univ., Diss., 2001
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  • 3
    Online-Ressource
    Online-Ressource
    The influence of hydrogen sulfide on the benthic community structure at cold seeps and interactions between the cold-seep and deep-sea ecosystems : three case studies (2001)
    Kiel
    Details Verfügbarkeit
    Schlagwort(e): Dissertation ; Hochschulschrift
    Materialart: Online-Ressource
    Seiten: 1 Online-Ressource (97 Seiten = 6 MB) , Illustrationen, Graphen, Karten
    Ausgabe: Online-Ausgabe 2023
    URL: https://oceanrep.geomar.de/id/eprint/14920/
    Sprache: Englisch
    Anmerkung: Zusammenfassung in deutscher und englischer Sprache
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  • 4
    Online-Ressource
    Online-Ressource
    Untersuchungen an cold seep assoziierten Organismen im NE-Pazifik (1997)
    Kiel
    Details Verfügbarkeit
    Schlagwort(e): Diplomarbeit ; Hochschulschrift
    Materialart: Online-Ressource
    Seiten: 1 Online-Ressource (101 Seiten = 6 MB) , Illustrationen, Graphen, Karten
    Ausgabe: Online-Ausgabe 2023
    URL: https://oceanrep.geomar.de/id/eprint/14276/
    Sprache: Deutsch
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  • 5
    facet.materialart.
    Unbekannt
    Temperature, chloride and sulfate measurements of samples from RV METEOR cruise M112 (2017)
    PANGAEA
    In:  Supplement to: Loher, Markus; Pape, Thomas; Marcon, Yann; Römer, Miriam; Wintersteller, Paul; Praeg, Daniel; Torres, Marta E; Sahling, Heiko; Bohrmann, Gerhard (2018): Mud extrusion and ring-fault gas seepage – upward branching fluid discharge at a deep-sea mud volcano. Scientific Reports, 8, 6275, https://doi.org/10.1038/s41598-018-24689-1
    Details
    Publikationsdatum: 2023-03-03
    Beschreibung: Submarine mud volcanoes release sediments and gas-rich fluids at the seafloor via deeply-rooted plumbing systems that remain poorly understood. Here the functioning of Venere mud volcano, on the Calabrian accretionary prism in ~1,600 m water depth is investigated, based on multi-parameter hydroacoustic and visual seafloor data obtained using ship-borne methods, ROVs, and AUVs. Two seepage domains are recognized: mud breccia extrusion from a summit, and hydrocarbon venting from peripheral sites, hosting chemosynthetic ecosystems and authigenic carbonates indicative of long-term seepage. Pore fluids in freshly extruded mud breccia (up to 13 °C warmer than background sediments) contained methane concentrations exceeding saturation by 2.7 times and chloride concentrations up to five times lower than ambient seawater. Gas analyses indicate an underlying thermogenic hydrocarbon source with potential admixture of microbial methane during migration along ring faults to the peripheral sites. The gas and pore water analyses point to fluids sourced deep (〉3 km) below Venere mud volcano. An upward-branching plumbing system is proposed to account for co-existing mud breccia extrusion and gas seepage via multiple surface vents that influence the distribution of seafloor ecosystems. This model of mud volcanism implies that methane-rich fluids may be released during prolonged phases of moderate activity.
    Schlagwort(e): Center for Marine Environmental Sciences; MARUM
    Materialart: Dataset
    Format: application/zip, 26 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 6
    facet.materialart.
    Unbekannt
    Profiles of sediment echo soundings during three expeditions (M72/3, M84/2, and MSM15/2) in the Black Sea with links to Parasound data files (2012)
    PANGAEA
    In:  Supplement to: Römer, Miriam; Sahling, Heiko; Pape, Thomas; Bahr, André; Feseker, Tomas; Wintersteller, Paul; Bohrmann, Gerhard (2012): Geological control and magnitude of methane ebullition from a high-flux seep area in the Black Sea - the Kerch seep area. Marine Geology, 319, 57-74, https://doi.org/10.1016/j.margeo.2012.07.005
    Details
    Publikationsdatum: 2023-05-12
    Beschreibung: We investigated gas bubble emissions at the Don-Kuban paleo-fan in the northeastern Black Sea regarding their geological setting, quantities as well as spatial and temporal variabilities during three ship expeditions between 2007 and 2011. About 600 bubble-induced hydroacoustic anomalies in the water column (flares) originating from the seafloor above the gas hydrate stability zone (GHSZ) at ~700 m water depth were found. At about 890 m water depth a hydrocarbon seep area named "Kerch seep area" was newly discovered within the GHSZ. We propose locally domed sediments ('mounds') discovered during ultra-high resolution bathymetric mapping with an autonomous underwater vehicle (AUV) to result from gas hydrate accumulation at shallow depths. In situ measurements indicated spatially limited temperature elevations in the shallow sediment likely induced by upward fluid flow which may confine the local GHSZ to a few meters below the seafloor. As a result, gas bubbles are suspected to migrate into near-surface sediments and to escape the seafloor through small-scale faults. Hydroacoustic surveys revealed that several flares originated from a seafloor area of about 1 km**2 in size. The highest flare disappeared in about 350 m water depth, suggesting that the released methane remains in the water column. A methane flux estimate, combining data from visual quantifications during dives with a remotely operated vehicle (ROV) with results from ship-based hydroacoustic surveys and gas analysis revealed that between 2 and 87 x 10**6 mol CH4 yr-1 escaped into the water column above the Kerch seep area. Our results show that the finding of the Kerch seep area represents a so far underestimated type of hydrocarbon seep, which has to be considered in methane budget calculations.
    Schlagwort(e): Center for Marine Environmental Sciences; MARUM
    Materialart: Dataset
    Format: application/zip, 2 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 7
    facet.materialart.
    Unbekannt
    (Table 10) Measurements of right valves of Calyptogena costaricana
    PANGAEA
    Details
    Publikationsdatum: 2023-05-12
    Schlagwort(e): 123; 134; Calculated; Calyptogena makranensis, height of valve; Calyptogena makranensis, height of valve/length of valve ratio; Calyptogena makranensis, length of fibrous ligament; Calyptogena makranensis, length of fibrous ligament/length of posterior lamellar ligament; Calyptogena makranensis, length of fibrous ligament/length of valve ratio; Calyptogena makranensis, length of posterior lamellar ligament; Calyptogena makranensis, length of posterior lamellar ligament/length of valve; Calyptogena makranensis, length of valve; Calyptogena makranensis, position of umbo; Calyptogena makranensis, width of valve; Calyptogena makranensis, width of valve/length of valve ratio; Center for Marine Environmental Sciences; Elevation of event; Event label; Latitude of event; Longitude of event; M54/3A; M54/3A_123; M54/3A_134; MARUM; Measured using callipers; Meteor (1986); Television-Grab; TVG; Type
    Materialart: Dataset
    Format: text/tab-separated-values, 84 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 8
    facet.materialart.
    Unbekannt
    Gas emissions at the continental margin west off Svalbard during R/V Heinche cruise HE387 (2014)
    PANGAEA
    In:  Supplement to: Sahling, Heiko; Römer, Miriam; Pape, Thomas; Bergès, Benoit; dos Santos Ferreira, Christian; Boelmann, Jan; Geprägs, Patrizia; Tomczyk, Michal; Nowald, Nicolas; Dimmler, Werner; Schroedter, Leah; Glockzin, Michael; Bohrmann, Gerhard (2014): Gas emissions at the continental margin west of Svalbard: mapping, sampling, and quantification. Biogeosciences, 11(21), 6029-6046, https://doi.org/10.5194/bg-11-6029-2014
    Details
    Publikationsdatum: 2023-08-12
    Beschreibung: We mapped, sampled, and quantified gas emissions at the continental margin west of Svalbard during R/V Heincke cruise He-387 in late summer 2012. Hydroacoustic mapping revealed that gas emissions were not limited to a zone just above 396 m below sea level (m b.s.l.). Flares from this depth gained significant attention in the scientific community in recent years because they may be caused by bottom water-warming induced hydrate dissolution in the course of global warming and/or by recurring seasonal hydrate formation and decay. We found that gas emissions occurred widespread between about 80 and 415 m b.s.l. which indicates that hydrate dissolution might only be one of several triggers for active hydrocarbon seepage in that area. Gas emissions were remarkably intensive at the main ridge of the forlandet moraine complex in 80 to 90 m water depths, and may be related to thawing permafrost. Focused seafloor investigations were performed with the remotely operated vehicle (ROV) "Cherokee". Geochemical analyses of gas bubbles sampled at about 240 m b.s.l. as well as at the 396 m gas emission sites revealed that the vent gas is primarily composed of methane (〉 99.70%) of microbial origin (average d13C = -55.7 per mil V-PDB). Estimates of the regional gas bubble flux from the seafloor to the water column in the area of possible hydrate decomposition were achieved by combining flare mapping using multibeam and single beam echosounder data, bubble stream mapping using a ROV-mounted horizontally-looking sonar, and quantification of individual bubble streams using ROV imagery and bubble counting. We estimated that about 53 × 10**6 mol methane were annually emitted at the two areas and allow a large range of uncertainty due to our method (9 to 118 × 10**6 mol yr**-1). These amounts, first, show that gas emissions at the continental margin west of Svalbard were in the same order of magnitude as bubble emissions at other geological settings, and second, may be used to calibrate models predicting hydrate dissolution at present and in the future, third, may serve as baseline (year 2012) estimate of the bubble flux that will potentially increase in future due to ever-increasing global-warming induced bottom water-warming and hydrate dissolution.
    Schlagwort(e): Center for Marine Environmental Sciences; MARUM
    Materialart: Dataset
    Format: application/zip, 2 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 9
    facet.materialart.
    Unbekannt
    Gas bubble emissions from submarine hydrocarbon seeps at the Makran continental margin (offshore Pakistan) (2012)
    PANGAEA
    In:  Supplement to: Römer, Miriam; Sahling, Heiko; Pape, Thomas; Spieß, Volkhard; Bohrmann, Gerhard (2012): Quantification of gas bubble emissions from submarine hydrocarbon seeps at the Makran continental margin (offshore Pakistan). Journal of Geophysical Research: Oceans, 117, C10015, https://doi.org/10.1029/2011JC007424
    Details
    Publikationsdatum: 2023-12-04
    Beschreibung: Evidence for twelve sites with gas bubble emissions causing hydroacoustic anomalies in 18 kHz echosounder records ('flares') was obtained at the convergent Makran continental margin. The hydroacoustic anomalies originating from hydrocarbon seeps at water depths between 575 and 2870 m disappeared after rising up to 2000 m in the water column. Dives with the remotely operated vehicle 'Quest 4000 m' revealed that several individual bubble vents contributed to one hydroacoustic anomaly. Analyzed gas samples suggest that bubbles were mainly composed of methane of microbial origin. Bubble size distributions and rise velocities were determined and the volume flux was estimated by counting the emitted bubbles and using their average volume. We found that a low volume flux (Flare 1 at 575 mbsl: 90 ml/min) caused a weak hydroacoustic signal in echograms whereas high volume fluxes (Flare 2 at 1027 mbsl: 1590 ml/min; Flare 5 C at 2870 mbsl: 760 ml/min) caused strong anomalies. The total methane bubble flux in the study area was estimated by multiplying the average methane flux causing a strong hydroacoustic anomaly in the echosounder record with the total number of equivalent anomalies. An order-of-magnitude estimate further considers the temporal variability of some of the flares, assuming a constant flux over time, and allows a large range of uncertainty inherent to the method. Our results on the fate of bubbles and the order-of-magnitude estimate suggest that all of the ?40 ± 32 ? 106 mol methane emitted per year within the gas hydrate stability zone remain in the deep ocean.
    Schlagwort(e): Center for Marine Environmental Sciences; MARUM
    Materialart: Dataset
    Format: application/zip, 4 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 10
    facet.materialart.
    Unbekannt
    (Table 4) Measurements of right valves of Abyssogena southwardae n.sp. (2010)
    PANGAEA
    Details
    Publikationsdatum: 2024-06-26
    Schlagwort(e): 11; Abyssogena soutwardae, height of valve; Abyssogena soutwardae, height of valve/length of valve ratio; Abyssogena soutwardae, length of fibrous ligament/length of posterior lamellar ligament ratio; Abyssogena soutwardae, length of fibrous ligament/length of valve ratio; Abyssogena soutwardae, length of fibrous part of ligament; Abyssogena soutwardae, length of posterior lamellar ligament/length of valve; Abyssogena soutwardae, length of posterior lamellar part of ligament; Abyssogena soutwardae, length of valve; Abyssogena soutwardae, position of umbo; Abyssogena soutwardae, width of valve; Abyssogena soutwardae, width of valve/length of valve ratio; Advance_II_11; Akademik Mstislav Keldysh; ALVIN; AMK41; AMK41-3869-1; Anyas Garden, Logatchev area; AT_3133; Barbados; BARESNAUT_Pl_94; Calculated; Center for Marine Environmental Sciences; Comment; Elevation of event; Event label; HYDROMAR1; Latitude of event; Logachev Hydrothermal Field, diffusive field; Longitude of event; M60/3; M60/3-66-ROV; M66/1; M66/1_395; MARUM; Measured using callipers; Meteor (1986); Mid-Atlantic Ridge at 10-15°N; MIR; MIR deep-sea manned submersible; offshore Virginia; off the Canary Archipelago, Henry Seamount; Remote operated vehicle; ROV; Submersible Alvin; Type
    Materialart: Dataset
    Format: text/tab-separated-values, 169 data points
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    DATA PANGAEA
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