4e9b5cc6e2d15d7a81a26abeed3de275 English dataset Helen Peat UK Polar Data Centre Acting Head of the UK Polar Data Centre High Cross Cambridge Cambridgeshire CB3 0ET United Kingdom PDCServiceDesk@bas.ac.uk https://www.bas.ac.uk/data/uk-pdc/ pointOfContact 2026-03-16T10:33:27 MEDIN 3.1.1 urn:ogc:def:crs:EPSG::4326 OGP Arctic Ocean Hydrate Dissociation Study 2011/12 British Oceanographic Data Centre record 1048ArcticHydrate2011-12 2018-02-06 publication 2017-09-18 creation 2026-03-16 revision EDMED6624 http://www.bodc.ac.uk/ This dataset includes two cruises of data collected to investigate Arctic hydrate dissociation as a consequence of climate change and to determine vulnerable methane reservoir and gas escape mechanisms. Work during both JR269A and JR269B was focused on two separate geographical areas. The first of these was west of Prins Karls Forland, in water depths of between 150 and 1200 m. At its landward end, this survey area crosses a region at water depths up to 400 m where a dense concentration of methane escape bubble plumes occur. The second survey area straddles the summit of the Vestnesa Ridge, in water depths of 1180 to 1400 m, and is also the site of methane escape bubble plumes within the water column and of fluid escape chimneys and pockmarks previously imaged at and beneath the sea bed. This area lies approximately 100 km west of the mouth of Kongsfjorden. Data collection took place between August 2011 and July 2012. The research expedition used a deep-towed, very high resolution seismic system to image the small-scale structures that convey gas to the seabed and to detect the presence of gas in the sediments. This was done in conjunction with an electromagnetic exploration system that uses a deep-towed transmitter and receivers on the seabed to derive the variations in electrical resistivity in the sediments beneath the seabed. The observations carried out on the two cruises included; underway, meteorological observations and echo sounder data, multichannel seismic reflection profiling data, wide angle seismic survey data, and ocean bottom seismometer (OBS) data, ocean bottom electro-magnetometer data and controlled source electromagnetic surveys (CSEM). The overall objectives of the project were to determine the spatial distribution of gas and hydrate accumulations beneath the sea bed; to investigate and understand gas transport and escape mechanisms, their spatial distribution, and the controls on these; and to quantify gas and hydrate saturation values in situ within the pore spaces of the shallow sediment reservoirs. The research is focused on specific areas where significant accumulations of methane hydrate and active methane venting through the sea floor were observed and documented during the earlier JR211 cruise in 2008. This is a NERC funded project hosted by University of Southampton. The data held at BODC include multichannel seismic reflection, TOPAS sub-bottom profiler and 2D seismic reflection data in SEG-Y format. No further data are expected. Unknown University of Southampton School of Ocean and Earth Science Unknown +44 (0)23 8059 2011 National Oceanography Centre, European Way Southampton Hampshire SO14 3ZH United Kingdom soes@noc.soton.ac.uk http://www.soes.soton.ac.uk/ owner Unknown University of Southampton School of Ocean and Earth Science Unknown +44 (0)23 8059 2011 National Oceanography Centre, European Way Southampton Hampshire SO14 3ZH United Kingdom soes@noc.soton.ac.uk http://www.soes.soton.ac.uk/ originator British Oceanographic Data Centre Director Joseph Proudman Building 6 Brownlow Street Liverpool Merseyside L3 5DA United Kingdom enquiries@bodc.ac.uk https://www.bodc.ac.uk/ custodian British Oceanographic Data Centre Director Joseph Proudman Building 6 Brownlow Street Liverpool Merseyside L3 5DA United Kingdom enquiries@bodc.ac.uk https://www.bodc.ac.uk/ distributor asNeeded Geology GEMET - INSPIRE themes, version 1.0 2009-07-31 revision Two-dimensional seismic reflection Seismic reflection SeaDataNet Parameter Discovery Vocabulary 2023-12-12 revision Natural Environment Research Council Designated Data Centres Marine Environmental Data and Information Network MEDIN metadata record availability 2012-01-11 revision unknown SeaVoX Vertical Co-ordinate Coverages 2020-05-21 revision otherRestrictions No limitations apply Data are freely available to all following agreement to the terms and conditions of a Data Licence otherRestrictions Usage restrictions are specified in the terms of the licence English geoscientificInformation 6.00 16.00 78.50 79.0833 SeaVoX water bodies 2025-08-07 revision Greenland Sea 2011-08-27 2012-07-24 Binary https://www.bodc.ac.uk/about/contact_us/contact_details/ Enquiries contact details BODC's address, telephone and fax numbers for general enquiries offlineAccess dataset COMMISSION REGULATION (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 publication BODC protocols are based on the Open Archival Information System (OAIS) model enabling BODC to iterate towards compliance with the on-going evolution and development of community requirements including FAIR (Findable,Accessible,Interoperable,Reusable), TRUST (Transparency, Responsibility, User community, Sustainability, Technology) and CARE (Collective Benefit, Authority to Control, Responsibility, Ethics). Data managers quality assure submissions and assemble the metadata necessary for curation. Submissions (as received) are placed in a long-term accession and stored in triplicate across multiple sites. Appropriate data are transferred into a standard internal format with source variable names mapped to controlled vocabularies, documentation assembled, and metadata loaded into BODC databases. Access to these data is through direct request, the BODC website and through partner repositories such as SeaDataNet. Access control is attained by assigning a data policy to each set of data and this policy is used to administer access when data are requested. Discovery metadata is aligned with EU INSPIRE (through MEDIN) and SeaDataNet community standards. Data are converted to open community formats including Ocean Data View ASCII and SeaDataNet NetCDF, with data described using terms from the NERC vocabulary server. BODC submission agreements are documented on the BODC website and customer service is assured with a dedicated requests team that serve data following local regulations including General Data Protection Regulation (GDPR) 2018 and Environmental Information Regulations (EIR) 2004. true This dataset was created by the organisations with the "originator" role in this metadata record following their in-house data processing and quality control procedures. The data were then provided to the British Oceanographic Data Centre (BODC) for ingestion into one of the schemas of the National Oceanographic Database (NODB). During ingestion BODC undertake quality control, documentation and metadata enhancement procedures appropriate to the type of data. For an overview please see http://www.bodc.ac.uk/about/information_technology/data_processing_steps/. BODC supply full information about data collection, data processing and data quality with all data requests to enable users to assess data suitability themselves.Instrument(s) used to collect data: single-channel seismic reflection systems; >2000 Hz top-bandwidth sub-bottom penetrator and mud profiler systems; airgun.