4e9b5cc6e2d15d7a81a26abeed3de275 English dataset Helen Peat British Antarctic Survey Acting Head of the UK Polar Data Centre High Cross Madingley Road Cambridge CB3 OET United Kingdom polardatacentre@bas.ac.uk http://www.antarctica.ac.uk/about_bas/our_organisation/eid/pdc/index.php pointOfContact 2018-05-31T10:41:03 MEDIN Discovery Metadata Standard Version 2.3.8 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 2017-09-29 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 +44 (0)23 8059 3059 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 http://www.bodc.ac.uk/ custodian asNeeded Natural Environment Research Council Designated Data Centres Marine Environmental Data and Information Network MEDIN metadata record availability 2012-01-11 revision unknown Vertical Coverages 2013-02-06 revision Two-dimensional seismic reflection Seismic reflection SeaDataNet PDV 2018-04-05 revision Geology INSPIRE themes 2009-07-31 revision Usage restrictions are specified in the terms of the licence otherRestrictions Data are freely available to all following agreement to the terms and conditions of a Data Licence English geoscientificInformation 6.00 16.00 78.50 79.0833 2011-08-27 2012-07-24 British Oceanographic Data Centre Director Joseph Proudman Building 6 Brownlow Street Liverpool Merseyside L3 5DA United Kingdom enquiries@bodc.ac.uk http://www.bodc.ac.uk/ distributor dataset 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.