bd227931-7f33-419a-a84b-ae6c543a1cbb English HELCOM Secretariat data@helcom.fi 2021-09-09T11:59:00 EPSG:3035 Availability of deep water habitat, based on occurrence of H2S (HOLAS 2) 2018-01-15 https://metadata.helcom.fi/geonetwork/srv/eng/catalog.search#/metadata/bd227931-7f33-419a-a84b-ae6c543a1cbb 'Availability of deep water habitat, based on occurrence of H2S' layer describes the suitability of the bottom areas for the Baltic Sea biota, with regard to oxygen conditions of the near bottom waters. The data used to produce the layer was received from Leibniz-Institut für Ostseeforschung Warnemünde (IOW): - areas (polygons) with hydrogen sulfide (H2S) based on point measurements and modelling. Five time periods / year, for years 2011-2016 (altogether 30 layers). The polygons were converted to raster layers in a way, that for each time period (6 years, 5 time periods each year), areas with H2S got a value 0, other areas got the value 1. All layers were summed, (representing 6 years, 5 time periods each year, maximum value 30) and data was normalised. For more detailed information on the data used, please see Feistel et al. 2016. HELCOM Secretariat data@helcom.fi Bio-geographical regions GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme oxygen deficiency GEMET 2018-08-16 geonetwork.thesaurus.external.theme.gemet-en MADS HOLAS2 ecosystem component Biodiversity Use constraints: Data can be used freely given that the source is cited as "HELCOM HOLAS II Data set: Availability of deep water habitat, based on occurrence of H2S (2018)" Access constraints: No limitations on public access. English environment oceans 7.530495 34.131647 52.277123 66.475422 2011-01-01 2016-12-31 TIFF https://maps.helcom.fi/website/MADS/download/?id=bd227931-7f33-419a-a84b-ae6c543a1cbb 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 Data source: Polygon data on sulfidic areas kindly provided by Leibniz-Institut für Ostseeforschung Warnemünde (IOW). Separate maps can be viewed at http://www.io-warnemuende.de/msr-2016-0100.html. Reference: Feistel, S., Feistel, R., Nehring, D., Matthhäus, W., Nausch, G., Nauman n, M., 2016: Hypoxic and anoxic regions in the Baltic Sea, 1969-2015. Meereswiss. Ber, Warnemünde, 100. doi:10.12754/msr-2016-0100 in 2018 Availability of deep water habitat, based on occurrence of H2S layer has been updated with IOW data from 2016. Data quality: The data is based on monitoring data and modelling. For further information, see reference. Attribute information: Raster value representing an index value for oxygen. 0 value represents the lowest value for BS bottom communities, 1 the highest value.