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  • 1
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: Online-Ressource (PDF-Datei: 251 S., 4.28 MB) , Ill., graph. Darst., Kt.
    Language: German
    Note: Kiel, Univ., Diss., 2001
    Location Call Number Limitation Availability
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  • 2
    In: Marine chemistry, Amsterdam [u.a.] : Elsevier Science, 1972, 107(2007), 4, Seite 498-515, 0304-4203
    In: volume:107
    In: year:2007
    In: number:4
    In: pages:498-515
    Description / Table of Contents: Two newly developed coring devices, the Multi-Autoclave-Corer and the Dynamic Autoclave Piston Corer were deployed in shallow gas hydrate-bearing sediments in the northern Gulf of Mexico during research cruise SO174 (Oct- Nov 2003). For the first time, they enable the retrieval of near-surface sediment cores under ambient pressure. This enables the determination of in situ methane concentrations and amounts of gas hydrate in sediment depths where bottom water temperature and pressure changes most strongly influence gas/hydrate relationships. At seep sites of GC185 (Bush Hill) and the newly discovered sites at GC415, we determined the volume of low-weight hydrocarbons (C1 through C5) from nine pressurized cores via controlled degassing. The resulting in situ methane concentrations vary by two orders of magnitudes between 0.031 and 0.985 mol kg -1 pore water below the zone of sulfate depletion. This includes dissolved, free, and hydrate-bound CH4. Combined with results from conventional cores, this establishes a variability of methane concentrations in close proximity to seep sites of five orders of magnitude. In total four out of nine pressure cores had CH4 concentrations above equilibrium with gas hydrates. Two of them contain gas hydrate volumes of 15% (GC185) and 18% (GC415) of pore space. The measurements prove that the highest methane concentrations are not necessarily related to the highest advection rates. Brine advection inhibits gas hydrate stability a few centimeters below the sediment surface at the depth of anaerobic oxidation of methane and thus inhibits the storage of enhanced methane volumes. Here, computerized tomography (CT) of the pressure cores detected small amounts of free gas. This finding has major implications for methane distribution, possible consumption, and escape into the bottom water in fluid flow systems related to halokinesis.
    Type of Medium: Online Resource
    Pages: Ill., graph. Darst
    ISSN: 0304-4203
    Language: English
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  • 3
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    PANGAEA
    In:  Supplement to: MacDonald, Ian R; Bohrmann, Gerhard; Escobar, E; Abegg, Friedrich; Blanchon, Paul; Blinova, Valentina N; Brueckmann, Warner; Drews, Manuela; Eisenhauer, Anton; Han, X; Heeschen, Katja U; Meier, Felix; Mortera-Gutierrez, Carlos; Naehr, T; Orcutt, B; Bernard, B; Brroks, J; de Farágo, M (2004): Asphalt volcanism and chemosynthetic life, Campache Knolls, Gulf of Mexico. Science, 304(5673), 999-1002, https://doi.org/10.1126/science.1097154
    Publication Date: 2023-05-12
    Description: In the Campeche Knolls, in the southern Gulf of Mexico, lava-like flows of solidified asphalt cover more than 1 square kilometer of the rim of a dissected salt dome at a depth of 3000 meters below sea level. Chemosynthetic tubeworms and bivalves colonize the sea floor near the asphalt, which chilled and contracted after discharge. The site also includes oil seeps, gas hydrate deposits, locally anoxic sediments, and slabs of authigenic carbonate. Asphalt volcanism creates a habitat for chemosynthetic life that may be widespread at great depth in the Gulf of Mexico.
    Keywords: 136; Campeche Knoll; Carbon dioxide; Center for Marine Environmental Sciences; Ethane; Isobutane; MARUM; Methane; n-Butane; OTEGA II; Propane; Sample type; see reference(s); SO174/2; SO174/2_136; Sonne; Television-Grab; TVG; δ13C, carbon dioxide, gas hydrate; δ13C, ethane; δ13C, isobutane; δ13C, methane; δ13C, propane
    Type: Dataset
    Format: text/tab-separated-values, 31 data points
    Location Call Number Limitation Availability
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  • 4
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    Unknown
    PANGAEA
    In:  Supplement to: Heeschen, Katja U; Hohnberg, Hans-Jürgen; Haeckel, Matthias; Abegg, Friedrich; Drews, Manuela; Bohrmann, Gerhard (2007): In situ hydrocarbon concentrations from pressurized cores in surface sediments, Northern Gulf of Mexico. Marine Chemistry, 107(4), 498-515, https://doi.org/10.1016/j.marchem.2007.08.008
    Publication Date: 2023-06-27
    Description: Two newly developed coring devices, the Multi-Autoclave-Corer and the Dynamic Autoclave Piston Corer were deployed in shallow gas hydrate-bearing sediments in the northern Gulf of Mexico during research cruise SO174 (Oct-Nov 2003). For the first time, they enable the retrieval of near-surface sediment cores under ambient pressure. This enables the determination of in situ methane concentrations and amounts of gas hydrate in sediment depths where bottom water temperature and pressure changes most strongly influence gas/hydrate relationships. At seep sites of GC185 (Bush Hill) and the newly discovered sites at GC415, we determined the volume of low-weight hydrocarbons (C1 through C5) from nine pressurized cores via controlled degassing. The resulting in situ methane concentrations vary by two orders of magnitudes between 0.031 and 0.985 mol kg**-1 pore water below the zone of sulfate depletion. This includes dissolved, free, and hydrate-bound CH4. Combined with results from conventional cores, this establishes a variability of methane concentrations in close proximity to seep sites of five orders of magnitude. In total four out of nine pressure cores had CH4 concentrations above equilibrium with gas hydrates. Two of them contain gas hydrate volumes of 15% (GC185) and 18% (GC415) of pore space. The measurements prove that the highest methane concentrations are not necessarily related to the highest advection rates. Brine advection inhibits gas hydrate stability a few centimeters below the sediment surface at the depth of anaerobic oxidation of methane and thus inhibits the storage of enhanced methane volumes. Here, computerized tomography (CT) of the pressure cores detected small amounts of free gas. This finding has major implications for methane distribution, possible consumption, and escape into the bottom water in fluid flow systems related to halokinesis.
    Keywords: 152; 153; 158; 166; 170; Bush Hill; Center for Marine Environmental Sciences; DAPC; Dynamic autoclave piston corer; MAC; MARUM; Multi autoclave corer; OTEGA II; SO174/1; SO174/1_118; SO174/1_63; SO174/1_90; SO174/1_97; SO174/2; SO174/2_152; SO174/2_153; SO174/2_158; SO174/2_166; SO174/2_170; Sonne
    Type: Dataset
    Format: application/zip, 5 datasets
    Location Call Number Limitation Availability
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  • 5
    Publication Date: 2023-07-10
    Keywords: 152; 153; 158; 166; 170; Analysis; Bush Hill; Center for Marine Environmental Sciences; DAPC; Device type; Dynamic autoclave piston corer; Elevation of event; Event label; Latitude of event; Location type; Longitude of event; MAC; MARUM; Multi autoclave corer; OTEGA II; Pressure, water; Sample, optional label/labor no; SO174/1; SO174/1_118; SO174/1_63; SO174/1_90; SO174/1_97; SO174/2; SO174/2_152; SO174/2_153; SO174/2_158; SO174/2_166; SO174/2_170; Sonne
    Type: Dataset
    Format: text/tab-separated-values, 42 data points
    Location Call Number Limitation Availability
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  • 6
    Publication Date: 2023-06-27
    Keywords: 152; 153; 158; 166; 170; Bush Hill; C1 hydrocarbons; C2 hydrocarbons; C3 hydrocarbons; C5-isomers hydrocarbons; Center for Marine Environmental Sciences; DAPC; Device type; Dynamic autoclave piston corer; Elevation of event; Event label; Gas chromatography (Thermo-Electron), capillary column and FID; iso-C4 hydrocarbons; Latitude of event; Location type; Longitude of event; MAC; MARUM; Multi autoclave corer; n-C4 hydrocarbons; OTEGA II; SO174/1; SO174/1_118; SO174/1_63; SO174/1_90; SO174/2; SO174/2_152; SO174/2_153; SO174/2_158; SO174/2_166; SO174/2_170; Sonne; Volume
    Type: Dataset
    Format: text/tab-separated-values, 61 data points
    Location Call Number Limitation Availability
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  • 7
    Publication Date: 2023-06-27
    Keywords: 152; 153; 158; 166; 170; Bush Hill; Butane; Center for Marine Environmental Sciences; DAPC; Device type; Dynamic autoclave piston corer; Elevation of event; Ethane; Event label; Isobutane; Isopentane; Latitude of event; Location type; Longitude of event; MAC; MARUM; Methane; Multi autoclave corer; OTEGA II; Propane; see reference(s); SO174/1; SO174/1_118; SO174/1_63; SO174/1_90; SO174/2; SO174/2_152; SO174/2_153; SO174/2_158; SO174/2_166; SO174/2_170; Sonne
    Type: Dataset
    Format: text/tab-separated-values, 43 data points
    Location Call Number Limitation Availability
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  • 8
    Publication Date: 2023-06-27
    Keywords: 152; 153; 158; 170; Bush Hill; Center for Marine Environmental Sciences; DAPC; Device type; Dynamic autoclave piston corer; Elevation of event; Event label; Gas hydrate; Gas hydrate volume; Latitude of event; Length; Longitude of event; MAC; MARUM; Methane; Methane, absolute volume; Multi autoclave corer; OTEGA II; see reference(s); SO174/1; SO174/1_118; SO174/1_63; SO174/1_90; SO174/2; SO174/2_152; SO174/2_153; SO174/2_158; SO174/2_170; Sonne
    Type: Dataset
    Format: text/tab-separated-values, 58 data points
    Location Call Number Limitation Availability
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  • 9
    Publication Date: 2023-06-27
    Keywords: 158; 166; Bush Hill; C1 hydrocarbons; C2 hydrocarbons; C3 hydrocarbons; C5-isomers hydrocarbons; Center for Marine Environmental Sciences; Comment; DAPC; Dynamic autoclave piston corer; Elevation of event; Event label; Gas chromatography (Thermo-Electron), capillary column and FID; iso-C4 hydrocarbons; Latitude of event; Location type; Longitude of event; MAC; MARUM; Multi autoclave corer; n-C4 hydrocarbons; OTEGA II; SO174/2; SO174/2_158; SO174/2_166; Sonne; Standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 78 data points
    Location Call Number Limitation Availability
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  • 10
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    PANGAEA
    In:  Supplement to: Wallmann, Klaus; Drews, Manuela; Aloisi, Giovanni; Bohrmann, Gerhard (2006): Methane discharge into the Black Sea and the global ocean via fluid flow through submarine mud volcanoes. Earth and Planetary Science Letters, 248, 544-599, https://doi.org/10.1016/j.epsl.2006.06.026
    Publication Date: 2024-02-02
    Description: During the MARGASCH cruise M52/1 in 2001 with RV Meteor we sampled surface sediments from three stations in the crater of the Dvurechenskii mud volcano (DMV, located in the Sorokin Trough of the Black Sea) and one reference station situated 15 km to the northeast of the DMV. We analysed the pore water for sulphide, methane, alkalinity, sulphate, and chloride concentrations and determined the concentrations of particulate organic carbon, carbonate and sulphur in surface sediments. Rates of anaerobic oxidation of methane (AOM) were determined using a radiotracer (14CH4) incubation method. Numerical transport-reaction models were applied to derive the velocity of upward fluid flow through the quiescently dewatering DMV, to calculate rates of AOM in surface sediments, and to determine methane fluxes into the overlying water column. According to the model, AOM consumes 79% of the average methane flux from depth (8.9 x 10**+ 6 mol a**-1), such that the resulting dissolved methane emission from the volcano into the overlying bottom water can be determined as 1.9 x 10**+ 6 mol a**-1. If it is assumed that all submarine mud volcanoes (SMVs) in the Black Sea are at an activity level like the DMV, the resulting seepage represents less than 0.1% of the total methane flux into this anoxic marginal sea. The new data from the DMV and previously published studies indicate that an average SMV emits about 2.0 x 10**+ 6 mol a**-1 into the ocean via quiescent dewatering. The global flux of dissolved methane from SMVs into the ocean is estimated to fall into the order of 10**+10 mol a**-1. Additional methane fluxes arise during periods of active mud expulsion and gas bubbling occurring episodically at the DMV and other SMVs.
    Keywords: Black Sea; IFM-GEOMAR; Leibniz-Institut für Meereswissenschaften, Kiel; M52/1; M52/1_36-2; M52/1_48-2; M52/1_49-2; M52/1_6-1; Meteor (1986); MIC-3; MIC-4; MIC-5; MMIC; Multicorer with television; Multi Mini-Corer; TVMUC; TV-MUC-1
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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