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  • 2020-2024  (4)
  • 2023  (4)
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  • 2020-2024  (4)
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  • 1
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    Yam Seep at Four-Way Closure Ridge: a prominent active gas seep system at the accretionary wedge SW offshore Taiwan (2023)
    Springer
    Details
    Publication Date: 2024-02-07
    Description: Hydroacoustic surveys at the accretionary wedge southwest of Taiwan reveal a confined active hydrocarbon seepage area of ~ 49,000 m 2 in ~ 1350 m water depth on the northern crest of the Four-Way Closure Ridge, which we call Yam Seep. In this study, multibeam and side-scan sonar data acquired during surveys with an autonomous underwater vehicle during an expedition with R/V Ocean Researcher I in 2017 showed that the area is characterized by rough topography and high seafloor backscatter. Seafloor observations with a video sled and sediment sampling with gravity corers and the MeBo seafloor drill rig during an expedition with R/V SONNE in 2018 revealed that the area is almost entirely covered by intensely fractured methane-derived carbonates, which indicate that seepage has been ongoing for thousands of years. Hydroacoustic anomalies (‘flares’) in the water column indicated the presence of several gas bubble emission sites mostly at the center and eastern flank of the area in 2019. Drilling through massive carbonates in the northwestern part of Yam Seep induced free gas escape from a depth of ~ 5.1 m. This suggests the presence of gas hydrates in the subsurface as the seep area is located well within the gas hydrate stability zone. The inter-disciplinary investigations of the Yam Seep demonstrate that upward migration of light hydrocarbons and seafloor discharge has a considerable influence on the seabed properties.
    Type: Article , PeerReviewed
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Master track of HEINCKE cruise HE628 in 1 sec resolution (zipped, 100.5 MB) (2023)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Details
    Publication Date: 2024-04-20
    Description: Raw data acquired by position sensors on board RV Heincke during expedition HE628 were processed to receive a validated master track which can be used as reference of further expedition data. During HE628 the inertial navigation system IXSEA PHINS III and the GPS receivers Trimble Marine SPS461 and SAAB R5 SUPREME NAV were used as navigation sensors. Data were downloaded from DAVIS SHIP data base (https://dship.awi.de) with a resolution of 1 sec. Processed data are provided as a master track with 1 sec resolution derived from the position sensors' data selected by priority and a generalized track with a reduced set of the most significant positions of the master track.
    Keywords: 1 sec resolution; CT; FJORDGAS; HE628; HE628-track; Heincke; North Sea; Underway cruise track measurements
    Type: Dataset
    Format: application/zip, 100.5 MBytes
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Master tracks in different resolutions of HEINCKE cruise HE628, Longyearbyen - Stavanger, 2023-09-04 - 2023-10-01 (2023)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Details
    Publication Date: 2024-04-20
    Description: Raw data acquired by position sensors on board RV Heincke during expedition HE628 were processed to receive a validated master track which can be used as reference of further expedition data. During HE628 the inertial navigation system IXSEA PHINS III and the GPS receivers Trimble Marine SPS461 and SAAB R5 SUPREME NAV were used as navigation sensors. Data were downloaded from DAVIS SHIP data base (https://dship.awi.de) with a resolution of 1 sec. Processed data are provided as a master track with 1 sec resolution derived from the position sensors' data selected by priority and a generalized track with a reduced set of the most significant positions of the master track.
    Keywords: Calculated; Course; CT; DATE/TIME; FJORDGAS; HE628; HE628-track; Heincke; LATITUDE; LONGITUDE; North Sea; Speed; Underway cruise track measurements
    Type: Dataset
    Format: text/tab-separated-values, 7822 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Physical oceanographic profiles of 43 CTD casts during MARIA S. MERIAN cruise MSM98 in 20201 in the North Sea (2023)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: During the RV Maria S. Merian cruise 98, which took place between 08.01.2021 to 23.01.2021 bathymetry data based on multibeam echosounder (MBES) was recorded. The main objective of the cruise was focused on the hydrocarbon fluid emissions in the German North Sea and focused on the 'Entenschnabel'- area. In total, 43 CTDs were deployed, mainly to sample the methane content in the water column and to observe the stratigraphy of the water column. Oceanographic data as well as water samples have been collected at every CTD station. At the borehole locations of B11-2 and B18-1 but also at the DOK1-X Thor-1 and D1 well 4 CTDS per site have been deployed.Detailed information about the temperature, conductivity and oxygen of the water column have been carried out with a Seabird CTD/Rosette SBE911 with SBE-32 water sampler, equipped with 24 OTE bottles (10L).
    Keywords: -; borehole logging; Boreholes; Bottle number; Center for Marine Environmental Sciences; Counts; CTD/Rosette; CTD-RO; Density, mass density; Density, sigma-theta (0); DEPTH, water; Elevation of event; Entenschnabel; Event label; Fluorescence; Fluorometer, WET Labs ECO AFL/FL; GeoB24404-1; GeoB24404-2; GeoB24404-3; GeoB24404-4; GeoB24406-1; GeoB24407-1; GeoB24408-1; GeoB24414-1; GeoB24415-1; GeoB24416-1; GeoB24417-1; GeoB24418-1; GeoB24419-1; GeoB24420-1; GeoB24421-1; GeoB24422-1; GeoB24423-1; GeoB24424-1; GeoB24425-1; GeoB24426-1; GeoB24427-1; GeoB24428-1; GeoB24429-1; GeoB24445-1; GeoB24445-2; GeoB24445-3; GeoB24445-4; GeoB24450-1; GeoB24450-2; GeoB24450-3; GeoB24450-4; GeoB24451-1; GeoB24451-2; GeoB24452-1; GeoB24452-2; GeoB24455-1; GeoB24455-2; GeoB24455-3; GeoB24455-4; GeoB24456-1; GeoB24456-2; GeoB24456-3; GeoB24456-4; GPF 20‐3 092; hydrocarbons; Latitude of event; Longitude of event; Maria S. Merian; MARUM; MSM98; MSM98_14-1; MSM98_15-1; MSM98_16-1; MSM98_17-1; MSM98_18-1; MSM98_19-1; MSM98_20-1; MSM98_21-1; MSM98_22-1; MSM98_23-1; MSM98_24-1; MSM98_25-1; MSM98_26-1; MSM98_27-1; MSM98_28-1; MSM98_29-1; MSM98_4-1; MSM98_4-2; MSM98_4-3; MSM98_4-4; MSM98_45-1; MSM98_45-2; MSM98_45-3; MSM98_45-4; MSM98_50-1; MSM98_50-2; MSM98_50-3; MSM98_50-4; MSM98_51-1; MSM98_51-2; MSM98_52-1; MSM98_52-2; MSM98_55-1; MSM98_55-2; MSM98_55-3; MSM98_55-4; MSM98_56-1; MSM98_56-2; MSM98_56-3; MSM98_56-4; MSM98_6-1; MSM98_7-1; MSM98_8-1; North Sea; Optional event label; Oxygen; Oxygen saturation; Oxygen sensor, SBE 43; Pressure, water; Pressure sensor, Digiquartz; Radiation, photosynthetically active; Salinity; Sound velocity in water; Temperature, water; Temperature, water, potential; Turbidity (Nephelometric turbidity unit); Turbidity Meter, WET Labs ECO NTU
    Type: Dataset
    Format: text/tab-separated-values, 6524548 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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