satellite/9km/climatology/GMIS_A_K490_MM eng File Identifier of the parent series series Global Marine Information System, Directorate D - Sustainable Resources, Joint Research Centre JRC-EMIS@ec.europa.eu pointOfContact 2013-10-16 ISO19115 2003/Cor.1:2006 http://www.opengis.net/def/crs/EPSG/0/4936 GMIS - MODIS-AQUA Monthly climatology sea surface diffuse attenuation coefficient at 490nm (9km) in m^-1 2013-08-22 creation 2013-06-11T11:15:00 revision 2013-08-29 publication satellite/9km/climatology/GMIS_A_K490_MM https://jeodpp.jrc.ec.europa.eu/ftp/public/JRC-OpenData/GMIS Water Transparency (Diffuse attenuation coefficient at 490nm, Kd490 in m^-1 at 9km resolution): The diffuse attenuation coefficient Kd490 measures the light penetration in the water column at the blue-green wavelengths (ca. 490 nm). It represents a good indicator of water transparency resulting from the combined action of absorption and backscattering by the water constituents, and the structure of the surrounding light field. Global Marine Information System, Directorate D - Sustainable Resources, Joint Research Centre JRC-EMIS@ec.europa.eu pointOfContact Melin, Frederic European Commission, Joint Research Centre (JRC) frederic.melin@ec.europa.eu author sea surface diffuse attenuation coefficient climatology ocean color satellite observations marine environment coastal environment sea water protection marine monitoring GIS digital format climate change Environmental monitoring facilities Oceanographic geographical features Protected sites GEMET - INSPIRE themes, version 1.0 2008-06-01 publication environmental data GEMET - Concepts, version 2.4 2010-01-13 publication HYDROSPHERE (freshwater, marine water, waters) GEMET - Groups, version 2.4 2010-01-13 publication NATURAL ENVIRONMENT, ANTHROPIC ENVIRONMENT GEMET - Supergroups, version 2.4 2010-01-13 publication water GEMET - Themes, version 2.4 2010-01-13 publication OCEANS GEOSS - Earth Observation Vocabulary, version 1.0 2011-05-01 publication no conditions apply otherRestrictions no limitations 9 eng oceans environment -180.0 180.0 -90.0 90.0 2002-07-01 2017-12-31 https://jeodpp.jrc.ec.europa.eu/ftp/public/JRC-OpenData/GMIS/ Global Marine Information System WWW:LINK The Global Marine Information System (GMIS) provides information on marine ecosystems and coastal state, using biological and physical variables generated by satellite remote sensing. GMIS allows visualisation and download of Remote Sensing Ocean color data and derived products hosted at the Directorate D - Sustainable Resources. information https://jeodpp.jrc.ec.europa.eu/ftp/public/JRC-OpenData/GMIS/satellite/9km/climatology/ GMIS - Download access (GMIS_A_K490) WWW:DOWNLOAD Direct NetCDF download download series 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 See the referenced specification false General information: Monthly climatology sea surface diffuse attenuation coefficient at 490nm in m^-1 (log10 scalling) derived from the MODIS-AQUA sensor. Processing information: Kd(490) data is processed using SeaDAS 6.4 software and the standard algorithm for Kd(490) (Werdell 2005). Temporal characteristics: This dataset consists of standard Monthly climatology sea surface Kd(490) maps at 9km resolution (L3 product). Description of observation methods/instruments: The remote sensing of 'Ocean Colour' represents a measure of the spectral variations in the light leaving the water surface, subsequently interpreted in terms of concentrations of optically-significant constituents in the water. The electromagnetic signal collected by the sensor on-board the satellite is largely determined by photons that have never reached the water surface, but have been backscattered within the atmosphere through multiple interactions between gas molecules and aerosols. After removing the atmospheric contribution, the water leaving radiance recorded at a given time by the satellite reflects the optical properties of the water which, in turn, mirrors a specific structure and biogeochemical composition of the marine waters. The satellite-derived reflectance at the air-sea interface is related to apparent optical properties of the water constituents including Kd(490). Quality/accuracy/calibration information: The algorithm is an empirical band-ratio formula, with retrieval standard error and r^2 (for log-transformed data) of 0.28 and 0.89, respectively, as calculated over the development in situ data set (Werdell 2005). References: Werdell, P.J. (2005). Ocean color K490 algorithm evaluation. http://oceancolor.gsfc.nasa.gov/REPROCESSING/SeaWiFS/R5.1/k490_update.html Other contextual information: The product is stored in NetCDF data and available for download.