5e982b25-8110-4095-b6db-619947f52f4e English HELCOM Secretariat data@helcom.fi 2023-03-15T14:44:25 EPSG:3035 Relative distribution of nutrient concentration - Total Nitrogen (HOLAS 2) 2018-01-15 https://metadata.helcom.fi/geonetwork/srv/eng/catalog.search#/metadata/5e982b25-8110-4095-b6db-619947f52f4e Concentration of nitrogen pressure layer is interpolated from annual seasonal average of total nitrogen concentrations from surface waters (0-10 m) extracted from ICES’s oceanographic database, database of Swedish Meteorological and Hydrological Institute, EEA’s Eionet database and Data from Gulf of Finland year 2014. The points were interpolated to cover the entire Baltic Sea with Spline with barriers interpolation method. Values were log-transformed and normalised (more detailed description below). HELCOM Secretariat data@helcom.fi Bio-geographical regions GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme environmental impact nitrogen GEMET 2018-08-16 geonetwork.thesaurus.external.theme.gemet-en MADS HOLAS2 Spatial Pressures Use constraints: Data can be used freely given that the source is cited. Access constraints: No limitations on public access. English environment 7.822566 33.865816 52.502121 66.439254 2011-01-01 2016-12-13 TIFF https://maps.helcom.fi/website/MADS/download/?id=5e982b25-8110-4095-b6db-619947f52f4e WWW:LINK-1.0-http--link Download 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 Point wise concentration values (µmol / l) were aggregated to 5x5km grid and annual seasonal averages (2011-2016) were calculated per grid cell (winter: december, january, february; spring: march, april, may; summer: june, july, august; autumn: september, october, november). Grid values were interpolated to 1x1km grid with "spline with barriers" method. A mild generalisation was applied for the layer. All values above 95 percentile and under 5 percentile were grouped together to avoid over-influence of extreme values. Layer was log-transformed and normalised. Data source: ICES’s oceanographic database (http://www.ices.dk/marine-data/data-portals/Pages/ocean.aspx), For Sweden: SMHI (http://www.smhi.se/klimatdata/oceanografi/havsmiljodata/marina-miljoovervakningsdata), eionet (https://www.eionet.europa.eu/), Gulf of Finland year 2014. Data quality: Not known gaps Attribute information: Pressure value Spatial coverage: Entire Baltic Sea. Spatial resolution: Original data as points, interpolated to 1 km x 1 km grid.