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  • 2015-2019  (4)
  • 2015  (4)
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  • 2015-2019  (4)
Year
  • 1
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    Unknown
    Hydrochemistry measured on water bottle samples during James Cook cruise JC077 (2015)
    PANGAEA
    Details
    Publication Date: 2023-02-24
    Keywords: AA; Alkalinity, total; Autoanalyzer; Carbon, inorganic, dissolved; Cast number; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; ECO2; Elevation of event; Event label; Gas chromatography; James Cook; JC077; JC077-CTD1; JC077-CTD10; JC077-CTD11; JC077-CTD12; JC077-CTD13; JC077-CTD14; JC077-CTD15; JC077-CTD16; JC077-CTD17; JC077-CTD18; JC077-CTD19; JC077-CTD2; JC077-CTD20; JC077-CTD21; JC077-CTD22; JC077-CTD23; JC077-CTD24; JC077-CTD25; JC077-CTD26; JC077-CTD27; JC077-CTD28; JC077-CTD29; JC077-CTD3; JC077-CTD30; JC077-CTD31; JC077-CTD32; JC077-CTD33; JC077-CTD34; JC077-CTD35; JC077-CTD36; JC077-CTD37; JC077-CTD38; JC077-CTD39; JC077-CTD4; JC077-CTD40; JC077-CTD41; JC077-CTD42; JC077-CTD43; JC077-CTD44; JC077-CTD45; JC077-CTD46; JC077-CTD47; JC077-CTD48; JC077-CTD49; JC077-CTD5; JC077-CTD50; JC077-CTD51; JC077-CTD52; JC077-CTD53; JC077-CTD54; JC077-CTD55; JC077-CTD56; JC077-CTD57; JC077-CTD58; JC077-CTD59; JC077-CTD6; JC077-CTD60; JC077-CTD61; JC077-CTD62; JC077-CTD63; JC077-CTD64; JC077-CTD7; JC077-CTD8; JC077-CTD9; Latitude of event; Longitude of event; Methane; Nitrate and Nitrite; Oxygen; Phosphate; Silicate; Sub-seabed CO2 Storage: Impact on Marine Ecosystems; Titration; Titration, Winkler
    Type: Dataset
    Format: text/tab-separated-values, 1874 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Unknown
    Deep-Ocean dissolved organic matter in hydrothermal vents (2015)
    PANGAEA
    In:  Supplement to: Hawkes, Jeffrey A; Rossel, Pamela E; Stubbins, Aron; Butterfield, David A; Connelly, Douglas P; Achterberg, Eric Pieter; Koschinsky, Andrea; Chavagnac, Valerie; Hansen, Christian T; Bach, Wolfgang; Dittmar, Thorsten (2015): Efficient removal of recalcitrant deep-ocean dissolved organic matter during hydrothermal circulation. Nature Geoscience, 8(11), 856-860, https://doi.org/10.1038/ngeo2543
    Details
    Publication Date: 2024-02-17
    Description: Oceanic dissolved organic carbon (DOC) is an important carbon pool, similar in magnitude to atmospheric CO2, but the fate of its oldest forms is not well understood (Dittmar and Stubbins, 2014; Hansell, 2013, doi:10.1146/annurev-marine-120710-100757). Hot hydrothermal circulation may facilitate the degradation of otherwise un-reactive dissolved organic matter, playing an important role in the long-term global carbon cycle. The oldest, most recalcitrant forms of DOC, which make up most of oceanic DOC, can be recovered by solid-phase extraction. Here we present measurements of solid-phase extractable DOC from samples collected between 2009 and 2013 at seven vent sites in the Atlantic, Pacific and Southern oceans, along with magnesium concentrations, a conservative tracer of water circulation through hydrothermal systems. We find that magnesium and solid-phase extractable DOC concentrations are correlated, suggesting that solid-phase extractable DOC is almost entirely lost from solution through mineralization or deposition during circulation through hydrothermal vents with fluid temperatures of 212-401 °C. In laboratory experiments, where we heated samples to 380 °C for four days, we found a similar removal efficiency. We conclude that thermal degradation alone can account for the loss of solid-phase extractable DOC in natural hydrothermal systems, and that its maximum lifetime is constrained by the timescale of hydrothermal cycling, at about 40 million years (Elderfield and Schultz, 1996, doi:10.1146/annurev.earth.24.1.191).
    Keywords: Akademik Mstislav Keldysh; AMK47; AMK47-Lost_City; AT18-08; Atlantis (1997); Carbon, organic, dissolved; Carbon, organic, dissolved, extracted; Comment; Comment 2 (continued); Contamination; CTD/Rosette; CTD-RO; Description; Error; Event label; Factor; Identification; ISIS; ISIS MS2000; J2-574; J2-575; J2-576; J2-579; J2-580; J2-581; J2-583; James Cook; JC042; JC080; JC082; JC42_ISIS_130; JC42_ISIS_133; JC42_ISIS_134; JC42_ISIS_141; JC80_015_CTD; JC80_ISIS_189; JC80_ISIS_190; JC80_ISIS_194; JC82_ISIS_198; JC82_ISIS_200; JC82_ISIS_202; JC82_ISIS_204; JC82_ISIS_206; JC82_ISIS_207; Juan_de_Fuca_Ridge_Axial; Juan_de_Fuca_Ridge_Endeavour; Latitude of event; Lithology/composition/facies; Longitude of event; Lost City Hydrothermal Field, Mid-Atlantic Ridge; M82/3; M82/3_719-1; M82/3_722-1; M82/3_739-1; M82/3_756-1; Magnesium; Maria S. Merian; Meteor (1986); MIR; MIR deep-sea manned submersible; MSM10/3; MSM10/3_290ROV-11; MSM10/3_300; MSM10/3_313ROV-12; Name; Ocean and sea region; Percentage; Precision; Remote operated vehicle; Remote operated vehicle Jason II; ROV; ROVJ; Sample type; Sample volume; Sampling date; Site; Solid phase extractable; South Atlantic Ocean; tropical/subtropical North Atlantic; Type; Volume; Wakamiko_Crater
    Type: Dataset
    Format: text/tab-separated-values, 4130 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Unknown
    Fluxes and fate of dissolved methane released at the seafloor at the landward limit of the gas hydrate stability zone offshore western Svalbard (2015)
    AGU (American Geophysical Union) | Wiley
    In:  Journal of Geophysical Research: Oceans, 120 (9). pp. 6185-6201.
    Details
    Publication Date: 2017-05-02
    Description: Widespread seepage of methane from seafloor sediments offshore Svalbard close to the landward limit of the gas hydrate stability zone (GHSZ) may, in part, be driven by hydrate destabilization due to bottom water warming. To assess whether this methane reaches the atmosphere where it may contribute to further warming, we have undertaken comprehensive surveys of methane in seawater and air on the upper slope and shelf region. Near the GHSZ limit at ∼400 m water depth, methane concentrations are highest close to the seabed, reaching 825 nM. A simple box model of dissolved methane removal from bottom waters by horizontal and vertical mixing and microbially mediated oxidation indicates that ∼60% of methane released at the seafloor is oxidized at depth before it mixes with overlying surface waters. Deep waters are therefore not a significant source of methane to intermediate and surface waters; rather, relatively high methane concentrations in these waters (up to 50 nM) are attributed to isopycnal turbulent mixing with shelf waters. On the shelf, extensive seafloor seepage at 〈100 m water depth produces methane concentrations of up to 615 nM. The diffusive flux of methane from sea to air in the vicinity of the landward limit of the GHSZ is ∼4-20 μmol m-2 d-1, which is small relative to other Arctic sources. In support of this, analyses of mole fractions and the carbon isotope signature of atmospheric methane above the seeps do not indicate a significant local contribution from the seafloor source.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1002/2015JC011084
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
    facet.materialart.
    Unknown
    Efficient removal of recalcitrant deep-ocean dissolved organic matter during hydrothermal circulation (2015)
    Nature Publishing Group
    In:  Nature Geoscience, 8 (11). pp. 856-860.
    Details
    Publication Date: 2021-04-23
    Description: Oceanic dissolved organic carbon (DOC) is an important carbon pool, similar in magnitude to atmospheric CO2, but the fate of its oldest forms is not well understood. Hot hydrothermal circulation may facilitate the degradation of otherwise un-reactive dissolved organic matter, playing an important role in the long-term global carbon cycle. The oldest, most recalcitrant forms of DOC, which make up most of oceanic DOC, can be recovered by solid-phase extraction. Here we present measurements of solid-phase extractable DOC from samples collected between 2009 and 2013 at seven vent sites in the Atlantic, Pacific and Southern oceans, along with magnesium concentrations, a conservative tracer of water circulation through hydrothermal systems. We find that magnesium and solid-phase extractable DOC concentrations are correlated, suggesting that solid-phase extractable DOC is almost entirely lost from solution through mineralization or deposition during circulation through hydrothermal vents with fluid temperatures of 212-401°C. In laboratory experiments, where we heated samples to 380°C for four days, we found a similar removal efficiency. We conclude that thermal degradation alone can account for the loss of solid-phase extractable DOC in natural hydrothermal systems, and that its maximum lifetime is constrained by the timescale of hydrothermal cycling, at about 40 million years
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Format: text
    Format: text
    DOI: 10.1038/ngeo2543
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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