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  • PANGAEA  (3)
  • National Academy of Sciences  (1)
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  • 1
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    Unknown
    Geochemistry of sediment cores and hydrochemistry of water bottle samples in the North Sea during James Cook cruise JC077 (2017)
    PANGAEA
    In:  Supplement to: Lichtschlag, Anna; Cevatoglu, Melis; Connelly, Douglas P; James, Rachael H; Bull, Jonathan M (2018): Increased Fluid Flow Activity in Shallow Sediments at the 3 km Long Hugin Fracture in the Central North Sea. Geochemistry, Geophysics, Geosystems, 19(1), 2-20, https://doi.org/10.1002/2017GC007181
    Details
    Publication Date: 2023-02-24
    Description: The North Sea hosts a wide variety of seafloor seeps that may be important for transfer of chemical species, such as methane, from the Earth's interior to its exterior. Here we provide geochemical and geophysical evidence for fluid flow within shallow sediments at the recently discovered, 3 -km long Hugin Fracture in the Central North Sea. Although venting of gas bubbles was not observed, concentrations of dissolved methane were significantly elevated (up to six-times background values) in the water column at various locations above the fracture, and microbial mats that form in the presence of methane were observed at the seafloor. Seismic amplitude anomalies revealed a bright spot at a fault bend that may be the source of the water column methane. Sediment porewaters recovered in close proximity to the Hugin Fracture indicate the presence of fluids from two different shallow (〈500 m) sources: (i) a reduced fluid characterized by elevated methane concentrations and/or high levels of dissolved sulfide (up to 6 mmol L-1), and (ii) a low-chlorinity fluid (Cl ~305 mmol L-1) that has low levels of dissolved methane and/or sulfide. The area of the seafloor affected by the presence of methane-enriched fluids is similar to the footprint of seepage from other morphological features in the North Sea.
    Keywords: ECO2; Sub-seabed CO2 Storage: Impact on Marine Ecosystems
    Type: Dataset
    Format: application/zip, 25 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    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
  • 3
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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
  • 4
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    Unknown
    Vailulu'u Seamount, Samoa : life and death on an active submarine volcano (2006)
    National Academy of Sciences
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © National Academy of Sciences, 2006. This article is posted here by permission of National Academy of Sciences for personal use, not for redistribution. The definitive version was published in Proceedings of the National Academy of Sciences 103 (2006): 6448-6453, doi:10.1073/pnas.0600830103.
    Description: Submersible exploration of the Samoan hotspot revealed a new, 300-m-tall, volcanic cone, named Nafanua, in the summit crater of Vailulu'u seamount. Nafanua grew from the 1,000-m-deep crater floor in 〈4 years and could reach the sea surface within decades. Vents fill Vailulu'u crater with a thick suspension of particulates and apparently toxic fluids that mix with seawater entering from the crater breaches. Low-temperature vents form Fe oxide chimneys in many locations and up to 1-m-thick layers of hydrothermal Fe floc on Nafanua. High-temperature (81°C) hydrothermal vents in the northern moat (945-m water depth) produce acidic fluids (pH 2.7) with rising droplets of (probably) liquid CO2. The Nafanua summit vent area is inhabited by a thriving population of eels (Dysommina rugosa) that feed on midwater shrimp probably concentrated by anticyclonic currents at the volcano summit and rim. The moat and crater floor around the new volcano are littered with dead metazoans that apparently died from exposure to hydrothermal emissions. Acid-tolerant polychaetes (Polynoidae) live in this environment, apparently feeding on bacteria from decaying fish carcasses. Vailulu'u is an unpredictable and very active underwater volcano presenting a potential long-term volcanic hazard. Although eels thrive in hydrothermal vents at the summit of Nafanua, venting elsewhere in the crater causes mass mortality. Paradoxically, the same anticyclonic currents that deliver food to the eels may also concentrate a wide variety of nektonic animals in a death trap of toxic hydrothermal fluids.
    Description: This work was supported by the National Oceanic and Atmospheric Administration (NOAA) Oceans Exploration and the Hawaii Undersea Research Laboratory–NOAA Undersea Research Program, the National Science Foundation, the Australian Research Council, and the SERPENT program.
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: 5598800 bytes
    Format: application/pdf
    Location Call Number Limitation Availability
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    PAPER (OA)
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