Annual geometric mean of Chlorophyll-a in the Baltic Sea (Sentinel-3 OLCI) 2016–/Yearly geometric mean of Chlorophyll-a in the Baltic Sea (Sentinel-3 OLCI) 2016—

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Provided by Finnish Digital Agency / Population Register Centre

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Dataset information

Country of origin
Updated
Created
2022.02.01
Available languages
Finnish
Keywords
satelliittihavaintotieto, status-assessment, water-body, remote-sensing, tarkka, water-framework-directive, ecological-status, coastal-water, ei-inspire, earth-observation, ecological-assessment, water-quality, eutrophication, surface-water, sea-regions, chlorophyll, satellite-image, sea-water, monitoring
Quality scoring
225

Dataset description

**[FI]** satellite observations are used for monitoring chlorophyll a (ug/l) in surface water in the Baltic Sea. Chlorophyll A (chl-a) describes the amount of algae in water, but not directly the number of cyanobacteria. It is also a key factor in assessing the level of eutrophication of water. The data represents the annual level of chlorophyll a during the summer, covering all cloudless observations from the beginning of June to the end of September. The data are calculated using the geometric mean of all observations for each pixel, which represents statistically well the distribution of the data.The material has a terrain separation capacity of 300 m. Chlorophyll A compiled in SYKE for 2016 — using the observations of the EU Copernicus Sentinel-3 series OLCI (Ocean and Land Color Instrument). Satellite observations have been processed to concentrations of a chlorophyll using the FUB (Freie University of Berlin) (Shcroeder et al., 2007). Seasonal composites represent for each year the concentrations of chlorophyll-a in the period from 1 June to 30 September. This period is used for HELCOM’s A-Chlorophyll Status Assessments and for EU Directive Reporting for High Seas (Marine Strategy Directive). Purpose: Assessment and eutrophication of water status in the Baltic Sea. The material is part of SYKE’s open data (CC BY 4.0). *** **[En]** Satellite remote sensing is used to monitor the Chlorophyll-a (ug/l) of surface water in the Baltic Sea. Chlorophyll-a (chl-a) represents the quantity of algae in the water but not directly the amount of Cyanobacteria. The dataset describes the annual level on summerly chl-a. All non-cloudy daily images have been accounted from the period of June-September. The dataset is calculated using geometric mean of all observations for each pixel. The spatial resolution is 300 meters. The Chlorophyll-a dataset for years 2016– have been calculated in the Finnish Environment Institute (SYKE) using EU Copernicus program Sentinel-3 series OLCI (Ocean and Land Colour Instrument) observations. Satellite observations have been processed to chl-a concentrations using a neural network-based FUB processor (Shcroeder et al., 2007). The season composites describe the level chl-a concentrations for the period of 1.6.-30.9. The period used for the aggregate of summerly observations follows the status assessment periods accounted in HELCOM chl-a status assessment and the directive reporting (Marine Strategy Directive). Purpose of use: Status assessment and monitoring eutrophication of the water in the Baltic Sea. *** ## References/References Schroeder, T., Schaale, M., & Fischer, J. (2007). Retrieval of atmospheric and oceanic properties from MERIS measurements: A new Case-2 water processor for BEAM. International Journal of Remote Sensing, 28(24), 5627-5632. *** **WMS server/WMS service endpoint**: https://geoserver2.ymparisto.fi/geoserver/eo/wms **WMS level/WMS layer**: S3_OLCI_CHLA_geomean_yearly_assper_[YEAR] *** **[EN]** Composures are calculated from all observations of the OLCI instrument of the Sentinel-3 satellite in the summer season. *** **[En]** Composites have been calculated from all observations of the Sentinel-3 satellite’s OLCI instrument for the summer season.
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