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Marine Environmental Data and Information Network

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  • This dataset contains high and low water values manually digitised from historic hand-written tabulated ledgers, from the Port of London Authority (PLA). The dataset contains 463 years of data, from across 15 tide gauge sites along the Thames Estuary (bounding box = -0.3159W, 51.3914N, 1.3797E, 51.8428N), for the period 1911 to 1995. When these historic records are combined with digital records available from the PLA since 1995, the new sea level time-series spans the 109-year period from 1911 to 2019. London is one of the world’s most important coastal cities and is located around the Thames Estuary. Quantifying changes in sea levels in the Thames Estuary over the 20th century and early part of the 21st century is vital to inform future management of flood risk in London. This dataset is of importance for ongoing monitoring of mean sea-level rise, and changes in tidal range and extreme sea levels in the Thames Estuary. The project was led by the Ocean and Earth Science, University of Southampton and the Environment Agency, with contributions from the Leibniz Institute for Baltic Sea Research Warnemunde and the National Oceanography Centre. The study contributes to the objectives of UK National Environment Research Council (NERC) project E-Rise: Earliest detection of sea-level rise accelerations to inform lead time to upgrade/replace coastal flood defence infrastructure (NE/P009069/1; I.D.H.).

  • The WireWall project developed a prototype wave overtopping field measurement system. The system was designed and trailed at Crosby Beach, Hall Road carpark, north of Liverpool during winter 2018/2019. The data collected include both wave-by-wave overtopping volumes and horizontal velocities. At the time of the project the coastal structure at this site comprised a stepped revetment and vertical sea wall with a recurve. The system was designed at the National Oceanography Centre, validated in HR Wallingford’s flume facility and deployed with Sefton Council. Five datasets are available from the project. These contain processed data from: 1) The numerical wave overtopping estimates for past events used to design the system and plan deployments; 2) The numerical wave overtopping estimates for the joint wave and water level conditions with a 1 in 1 year return period probability to a 1 in 200 year return period probability in Liverpool Bay; 3) The dock side tests; 4) The physical laboratory experiments; and, 5) The field trials during windy spring tides. For Crosby these data can be used to validate/calibrate numerical tools used for coastal scheme design and flood hazard forecasting. Beach profile data collected alongside the overtopping measurements have been archived with the Northwest Regional Coastal Monitoring Programme, https://www.channelcoast.org/northwest/. This project was delivered by the National Oceanography Centre in collaboration with HR Wallingford. Our project partners were Sefton Council, Balfour Beatty, Environment Agency, Channel Coastal Observatory and Marlan Maritime Technologies.

  • A set of historical tide gauge sea level records from Santander (Northern Spain) have been recovered from logbooks stored at the Spanish National Geographical Institute (IGN). Sea level measurements have been digitised, quality-controlled and merged into a consistent sea level time series. Vertical references among instruments benchmarks have been derived from high precision vertical levelling surveys. The observations were recorded as daily averages and are from three different instruments in two locations in Santander (Spain). The historical sea level record in Santander consists of a daily time series spanning the period 1876-1924 and it is further connected to the modern tide gauge station nearby, ensuring datum continuity up to the present. The data from Santander comes from a floating gauge and then syphon gauges. This scarcity of long-term sea-level observations, as well as their uneven geographical distribution is a major challenge for climate studies that address, for example, the quantification of mean sea-level rise at centennial time scales, the accurate assessment of sea-level acceleration or the long-term changes in sea-level extremes that are vital for coastal risk assessments. This dataset represents an additional effort of sea-level data archaeology and aims at preserving the historical scientific heritage that has been up to now stored in old archives in non-electronic format. The research was partially funded by the Spanish Ministry of Science, Innovation and Universities. A further two series were rescued from Alicante under the same initiative.

  • The data set comprises time series of non-directional surface wave spectra from moored buoys and shipborne wave recorders at fixed locations. Individual spectra comprise some 60 or so estimates of wave energy at a range of spectral frequencies, computed from 20 to 30 minute recordings of the sea surface displacement/heave. The spectra are computed at intervals ranging from 1 to 3 hours. Data holdings comprise 500 recording months of data from some 14 sites across the continental shelf areas around the British Isles and the NE Atlantic between 1976 and 1995. Observation periods at specific sites vary from 4 months to 6 years. Data from the following sites are included in the data set: Holderness offshore (53 55.9N, 000 01.4E 01; Mar 1986 - 31 Mar 1987); Holderness nearshore (53 55.7N, 000 03.5W; 01 Mar 1986 - 30 Jun 1986); West Bexington (50 38.1N, 002 42.5W; 01 Nov 1983 - 31 Mar 1985; 01 May 1985 - 26 Feb 1986; 01 May 1986 - 30 Apr 1987); West Bexington (50 36.0N, 002 39.6W; 01 Sep 1987 - 01 Apr 1988); Eddystone (50 10.0N, 004 15.0W; 01 Jan 1976 - 31 Dec 1981); Kinnairds Head (57 55.8N, 001 54.1W; 01 Feb 1980 - 30 Dec 1981); Scilly Isles (49 51.8N, 006 41.0W; 01 Apr 1979 - 31 Jul 1979; 01 Feb 1980 - 31 Dec 1982; 01 Apr 1983 - 31 Dec 1983); South Uist deep water (57 17.8N, 007 53.6W; 01 Aug 1980 - 31 Dec 1982); South Uist offshore (57 18.2N, 007 38.3W; 28 Feb 1976 - 30 Nov 1982); South Uist inshore (57 19.8N, 007 27.2W; 01 Apr 1978 - 31 Jul 1982); Channel Lightvessel( 49 54.4N, 002 53.7W; 01 Mar 1986 - 30 Jun 1987; 01 Apr 1988 - 30 Nov 1988); Dowsing Lightvessel (53 34.0N, 000 50.2E; 01 Jul 1985 - 31 Dec 1985; 01 Feb 1986 - 30 Jun 1986; 01 Sep 1986 - 30 Apr 1987; 01 Jul 1987 - 31 Dec 1987); Ocean Weather Ship Lima (57 00.0N, 020 00.0W; 01 Jan 1984 - 30 Jun 1988; 01 Aug 1988 - 31 Dec 1988); Seven Stones Lightvessel (50 03.8N, 006 04.4W; 01 Jan 1985 - 28 Feb 1986; 01 May 1986 - 31 Mar 1987; 01 May 1987 - 31 May 1987; 01 Oct 1987 - 31 Oct 1987; 01 Dec 1987 - 31 Dec 1987). The data originate almost exclusively from UK laboratories and are managed by the British Oceanographic Data Centre. Data collection is ongoing at some sites (for example, Seven Stones Lighvessel) but these data are not managed by BODC. They are part of the Centre for Environment, Fisheries and Aquaculture Science (CEFAS) wavenet network.

  • The International Bathymetric Chart of the Arctic Ocean (IBCAO) Version 4.0 is a gridded continuous terrain model covering ocean and land of the Arctic region. The grid has been compiled from data covering approximately 14.2 percent of the Arctic seafloor with multibeam bathymetry and about 5.5 percent with other sources, excluding digitized depth contours. The grid-cell size (resolution) is 200x200 m on a Polar Stereographic projection, with the true scale set at a latitude of 75 deg N and a central meridian of 0 deg. The horizontal datum is WGS 84 and the vertical datum is assumed Mean Sea Level. IBCAO Version 4.0 has been compiled with support from the Nippon Foundation-GEBCO-Seabed 2030 Project, an international effort whose goal it is to see the entire world ocean mapped by 2030. A geographic version of the Polar Stereographic grid serves as input to the General Bathymetric Chart of Oceans (GEBCO) global gridded terrain model.

  • This dataset consists of eastward and northward current components at 32 depth levels. The dataset is a gridded dataset, with grid resolution of 1.85 km. It covers the entire Irish Sea area, with a precise range from -2.7 degrees longitude to -7 degrees longitude and from 51 degrees latitude to 56 degrees latitude. The data are daily averages and cover the period from 01 January 1996 to 01 January 2007. The dataset was generated by the Proudman Oceanographic Laboratory Coastal Ocean Modelling System coupled with the Wave Modelling model (POLCOMS-WAM) as part of the Natural Environment Research Council (NERC) CoFEE project which ran from April 2007 to September 2010. The eastward and northward current components were used as input conditions into a coastal processes and sediment transport model which looked at the response of the north Liverpool coastline to extreme flooding events. The dataset was generated by the Proudman Oceanographic Laboratory (since April 2010, part of the UK National Oceanography Centre). The dataset consists of 132 data files in Climate and Forecast (CF) compliant NetCDF format.

  • The dataset consists of northward and eastward baroclinic and barotropic current vectors derived from a 40 year run of the Proudman Oceanographic Laboratory Coastal Ocean Modelling System (POLCOMS) numerical model, run from 01 January 1964 to 31 December 2004. The dataset consists of 41 data files in Climate and Forecast (CF) compliant NetCDF format. The data are supplied as a gridded dataset covering the entire northwest European continental shelf and extending out into the Atlantic Ocean. The grid resolution varies from 7.8 km to 14.2 km along the longitudinal axis and is at 12.3 km on the latitudinal axis. The model contains 40 depth layers. The model run was from 01 January 1964 to 31 December 2004. The barotropic currents were generated every 20 seconds, while the baroclinic currents were generated every 300 seconds. These generated currents were then averaged over a 25 hour tidal cycle to remove tidal current influence from the data. The dataset consists of 41 data files in Climate and Forecast (CF) compliant NetCDF format. The model simulations were run on the HECTOR supercomputer managed by the University of Edinburgh. The data were generated by the National Oceanography Centre (NOC) Liverpool as part of Natural Environment Research Council (NERC) National Capability (NC) funding looking at multi-decadal variability and trends in temperature of the northwest European continental shelf.

  • This project aims to provide an estimate of the extent to which microplastic concentrations are underestimated with traditional sampling. Sampling events focus on coastal waters, where microplastics are predicted to have the greatest influence on marine life, on both sides of the North Atlantic Ocean. Samples were collected in the Gulf of Maine (USA) in July 2013 and the western English Channel off the coast of Plymouth (UK) between July and September 2015. Microplastic debris was collected via surface trawls using 100, 333 and 500 micrometer nets. Data collection was funded by the Natural Environment Research Council (NERC Grant NE/L003988/1 and NE/L007010/1); University of Exeter and Plymouth Marine Laboratory collaboration fund; in-kind contributions from the ‘Rozalia Project’; March Limited of Bermuda philanthropic support.

  • The GEBCO_2021 Grid is a global continuous terrain model for ocean and land with a spatial resolution of 15 arc seconds. In regions outside of the Arctic Ocean area, the grid uses as a base, Version 2.2 of the SRTM15+ data set between latitudes of 50 degrees South and 60 degrees North. This data set is a fusion of land topography with measured and estimated seafloor topography. This version of SRTM15+ is similar to version 2.1 [Tozer et al., 2020] with minor updates. Version 2.2 uses predicted depths based on the V29 gravity model [Sandwell et al., 2019] and approximately 400 small areas containing suspect data were visually identified and removed from the grid. Included on top of this base grid are gridded bathymetric data sets developed by the four Regional Centers of The Nippon Foundation-GEBCO Seabed 2030 Project. The GEBCO_2021 Grid represents all data within the 2021 compilation. The compilation of the GEBCO_2021 Grid was carried out at the Seabed 2030 Global Center, hosted at the National Oceanography Centre, UK, with the aim of producing a seamless global terrain model. Outside of Polar regions, the gridded bathymetric data sets are supplied by the Regional Centers as sparse grids, i.e. only grid cells that contain data were populated, were included on to the base grid without any blending. The data sets supplied in the form of complete grids (primarily areas north of 60N and south of 50S) were included using feather blending techniques from GlobalMapper software. The primary GEBCO_2021 grid contains land and ice surface elevation information - as provided for previous GEBCO grid releases. In addition, for the 2021 release a version with under-ice topography/bathymetry information for Greenland and Antarctica is also available. The GEBCO_2021 Grid has been developed through the Nippon Foundation-GEBCO Seabed 2030 Project. This is a collaborative project between the Nippon Foundation of Japan and the General Bathymetric Chart of the Oceans (GEBCO). It aims to bring together all available bathymetric data to produce the definitive map of the world ocean floor by 2030 and make it available to all. Funded by the Nippon Foundation, the four Seabed 2030 Regional Centers include the Southern Ocean - hosted at the Alfred Wegener Institute, Germany; South and West Pacific Ocean - hosted at the National Institute of Water and Atmospheric Research, New Zealand; Atlantic and Indian Oceans - hosted at the Lamont Doherty Earth Observatory, Columbia University, USA; Arctic and North Pacific Oceans - hosted at Stockholm University, Sweden and the Center for Coastal and Ocean Mapping at the University of New Hampshire, USA.

  • This dataset consists of depth-averaged eastward and northward current components. Also present is the sea surface height above sea level. The dataset is a gridded dataset, with grid resolution of 1.85 km. It covers the entire Irish Sea area, with a precise range from -2.7 degrees longitude to -7 degrees longitude and from 51 degrees latitude to 56 degrees latitude. The data are 30 minute averages and cover the period from 01 January 1996 to 01 January 2007. The dataset was generated by the Proudman Oceanographic Laboratory Coastal Ocean Modelling System coupled with the Wave Modelling model (POLCOMS-WAM) as part of the Natural Environment Research Council (NERC) CoFEE project which ran from April 2007 to September 2010. The depth-averaged eastward and northward current components and sea surface height were used as input conditions into a coastal processes and sediment transport model which looked at the response of the north Liverpool coastline to extreme flooding events. The dataset was generated by the Proudman Oceanographic Laboratory (since April 2010, part of the UK National Oceanography Centre). The dataset consists of 264 data files in Climate and Forecast (CF) compliant NetCDF format.