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  • 2020-2024  (7)
  • 2023  (4)
  • 2022  (3)
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  • 2020-2024  (7)
Year
  • 1
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    Variability of Marine Methane Bubble Emissions on the Clayoquot Slope, Offshore Vancouver Island, Between 2017 and 2021 (2022)
    Frontiers
    Details
    Publication Date: 2024-02-07
    Description: Seabed methane gas emissions occur worldwide at cold seeps located along most continental margins. Fluxes of methane gas released from the seabed in the form of bubbles can be extremely variable even over short time intervals. Some factors controlling the variability are still poorly understood. Here, we report on the results of continuous long-term sonar monitoring of bubble emissions at a depth of 1,260 m on the Clayoquot Slope, northern Cascadia margin. With a total monitoring duration of 4 years and a sampling period of 1 h, this is by far the longest high temporal resolution monitoring of seabed methane gas release ever conducted. Our results provide evidence that the diurnal and semi-diurnal tides influence the timing of the onset and cessation of bubble emissions. However, gas emissions within the monitoring area are active more than 84% of the time, indicating that tides alone are not sufficient to make venting pause. We hypothesize that the gas fluxes are transient but generally sufficiently high to maintain ebullition independently of the tidally-induced bottom pressure variations. Results also show that the tides do not seem to modulate the vigor of active gas emissions.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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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
  • 3
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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
  • 4
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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
  • 5
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    Multibeam bathymetry raw data (EM 120 echosounder entire dataset) of RV METEOR during cruise M74/4 (2022)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Description: Multibeam bathymetry raw data using the ship's own Kongsberg (Simrad) EM 120 multibeam echosounder was not continuously recorded during RV METEOR cruise M74/4. Data was recorded on 15 days between 2007-11-30 and 2007-12-14. This dataset contains a survey at the islands of the Maldives. The approximate average depth of the entire dataset is around 700m. The data are archived at the Federal Maritime and Hydrographic Agency of Germany (Bundesamt für Seeschifffahrt und Hydrographie, BSH) and provided to PANGAEA database for data curation and publication. Ancillary sound velocity profiles (SVP) files from the cruise are not archived at the BSH, thus no SVP files are added to this dataset. However, data analysis of the multibeam raw data revealed that SVP has been changed several times during the survey. This publication is conducted within the efforts of the German Marine Research Alliance in the core area "Data management and Digitalization" (Deutsche Allianz Meeresforschung, DAM). Data are unprocessed and therefore contains incorrect depth measurements (artifacts) without further processing. Overall, it appears that the data quality is rather good to moderate since the gridded hillshade data showed relatively few obstacles. It appears, that the Kongsberg EM 710 multibeam echosounder was simultaneously running during data acquisition since the coverage is nearly the same (https://doi.org/10.1594/PANGAEA.942458). However this did not significantly affecting data quality (nevertheless, based on the data, whether a direct interference between both system exists is unknown). Data can be processed e.g. with the open source software package MB-System (Caress, D. W., and D. N. Chayes, MB-System: Mapping the Seafloor, http://www.mbari.org/products/research-software/mb-system/, 2022).
    Keywords: Bathymetry; Binary Object; Binary Object (File Size); Binary Object (Media Type); Comment; DAM_Underway; DAM Underway Research Data; Data file recording distance; Data file recording duration; DATE/TIME; ELEVATION; File content; Kongsberg datagram raw file name; LATITUDE; LONGITUDE; M74/4; M74/4_0_Underway-1; Meteor (1986); Multibeam Echosounder; NEOMA: The Neogene of the Maldives; Number of pings; Ship speed; Start of data file, depth; Start of data file, heading; Start of data file recording, date/time; Start of data file recording, latitude; Start of data file recording, longitude; Stop of data file, depth; Stop of data file, heading; Stop of data file recording, date/time; Stop of data file recording, latitude; Stop of data file recording, longitude; Swath-mapping system Simrad EM-120 (Kongsberg Maritime AS)
    Type: Dataset
    Format: text/tab-separated-values, 7724 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 6
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    Multibeam bathymetry raw data (Kongsberg EM710 entire dataset) of RV METEOR during cruise M74/4 (2022)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Description: Multibeam bathymetry raw data using the ship's own Kongsberg EM 710 multibeam echosounder was not continuously recorded during RV METEOR cruise M74/4. Data was recorded on 16 days between 2007-11-29 and 2007-12-14. This dataset contains a survey at the islands of the Maldives. The approximate average depth of the entire dataset is around 425m. The data are archived at the Federal Maritime and Hydrographic Agency of Germany (Bundesamt für Seeschifffahrt und Hydrographie, BSH) and provided to PANGAEA database for data curation and publication. Ancillary sound velocity profiles (SVP) files from the cruise are not archived at the BSH, thus no SVP files are added to this dataset. However, data analysis of the multibeam raw data revealed that SVP has been changed several times during the survey. This publication is conducted within the efforts of the German Marine Research Alliance in the core area "Data management and Digitalization" (Deutsche Allianz Meeresforschung, DAM). Data are unprocessed and therefore contains incorrect depth measurements (artifacts) without further processing. Overall, it appears that the data quality is rather poor since the gridded hillshade data showed relatively many obstacles (artifacts). It appears, that the Kongsberg (Simrad) EM 120 multibeam echosounder was simultaneously running during data acquisition since the data coverage is nearly the same. However whether this was affecting the data quality is unknown. The corresponding dataset of the Kongsberg (Simrad) EM 120 multibeam echosounder is comparably of much better data quality (https://doi.org/10.1594/PANGAEA.942457). Data can be processed e.g. with the open source software package MB-System (Caress, D. W., and D. N. Chayes, MB-System: Mapping the Seafloor, http://www.mbari.org/products/research-software/mb-system/, 2022).
    Keywords: Bathymetry; Binary Object; Binary Object (File Size); Binary Object (Media Type); Comment; DAM_Underway; DAM Underway Research Data; Data file recording distance; Data file recording duration; DATE/TIME; ELEVATION; File content; Kongsberg datagram raw file name; LATITUDE; LONGITUDE; M74/4; M74/4_0_Underway-2; Meteor (1986); Multibeam Echosounder; NEOMA: The Neogene of the Maldives; Number of pings; Ship speed; Start of data file, depth; Start of data file, heading; Start of data file recording, date/time; Start of data file recording, latitude; Start of data file recording, longitude; Stop of data file, depth; Stop of data file, heading; Stop of data file recording, date/time; Stop of data file recording, latitude; Stop of data file recording, longitude; Swath-mapping system Simrad EM710 (Kongsberg Maritime AS)
    Type: Dataset
    Format: text/tab-separated-values, 13536 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 7
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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: 2024-06-25
    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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