Chemistry

Data & products on marine water quality

Data Products

EMODnet Chemistry provides access to data products based on harmonized, standardized, validated datasets coming from all EU sea basins. Data products concern eutrophication, ocean acidification, contaminants and marine litter.

EMODnet Chemistry data products can be synthesized as follows:

Eutrophication

Gridded climatologies

They are spatially interpolated maps that display the depth variability over time of 5 variables: Dissolved inorganic nitrogen (DIN), Phosphate, Silicate, Chlorophyll - a, and Dissolved oxygen concentration. The tools used are the 2 dimensional DIVA version (Data Interpolating Variational Analysis) and its implemented version DIVAnd, that is the generalisation in n dimensions of the method (long, lat, depth, time, etc.). All maps can be customized selecting both depth and time ranges. An animation of the evolution over time of the parameters is also available. They are available to download as NetCDF, PNG, PDF, EPS, SVG, WebM (animation), MP4 (animation), KML. The maps can be also visualized by using OGC WMS and OPeNDAP web services.

Three main kinds of climatologies can be downloaded:

  • All European seas
  • By sea region
  • Coastal areas

Their main characteristics are detailed below:

All European seas

These monthly climatologies are built by combining available data of all EU sea basins.

Temporal coverage: 1960 - 2020;
Temporal resolution: monthly;
Spatial resolution: 0.25 degree;
Depth coverage: 0-5500 m;
Depth levels: 102;
Tool: DIVAnd;
Unit: mg/m3 or umol/l.

By sea region

These seasonal climatologies are built by combining data per sea region as 6-years running averages. For the Arctic Ocean, Baltic Sea, Black Sea and North Sea, the seasons are:
Winter: Dec – Feb
Spring: Mar – May
Summer: Jun – Aug
Autumn: Sep – Nov

For the Mediterranean Sea and NE Atlantic Ocean the seasons are:
Winter: Jan – Mar
Spring: Apr – Jun
Summer: Jul – Sep
Autumn: Oct –Dec

Temporal coverage: 1997 - 2017;
Temporal resolution: seasonal;
Spatial resolution: 0.1 degree (it slightly varies among regions);
Depth coverage: It widely varies among regions (minimum 0-200 m in the Black Sea; maximum 0-3000 m in the NE Atlantic);
Vertical resolution: finer near the surface;
Tool: Diva and DIVAnd (dependent on region);
Unit: mg/m3 or umol/l.

Coastal areas

These seasonal climatologies are built by combining data of specific coastal areas: Gulf of Riga (Baltic Sea), Danube Delta (Black Sea), Loire River (NE Atlantic Ocean), Po River (Mediterrranean Sea). The seasons are the same as for maps by sea region.

Temporal coverage: dependent on data availability and varies with regions and parameters;
Temporal resolution: seasonal;
Spatial resolution: 0.01 degree;
Depth coverage: dependent on data availability and varies with regions and parameters;
Tool: DIVAnd;
Unit: mg/m3 or umol/l.

Contaminants

Spatial distribution and MSFD focused data evaluation

These products display location of sampling stations and contribute to the evaluation of data quality and adequacy for environmental quality assessment in seawater, biota and sediment. The maps are available for ten selected substances included in the macro categories: Antifoulants, Hydrocarbons, Heavy metals, Polychlorinated biphenyls, Pesticides and biocides.

These products allow users to visualize the following information:

  • Data below and above Limit of Quantification (LOQ);
  • Data with LOQ above or below 30 percent of EQSD threshold values;
  • Sampled matrix.

Main characteristics are listed below:
Temporal coverage: 1970 - 2017;
Temporal resolution: annual;
Available to download as: shapefile and PNG;
Web services: WMS, WFS

Marine Litter

Spatial distribution, composition and abundance

Products for beach litter are divided in two macro categories, depending on the origin of data: official monitoring ( data considered for MSFD official evaluation and analysis) and other sources (data from monitoring, cleaning and research activities).

The maps allow users to visualize the following information:

  • Beaches locations and litter list used;
  • Number of surveys and temporal coverage;
  • Composition of litter according to material categories in percent;
  • Total litter abundance and specific litter group abundances.

Products for seafloor litter allow users to visualize the following information:

  • Survey locations and fishing gears used;
  • Composition of litter according to material categories in percent;
  • Total litter density and specific litter group densities.
For abundance and density maps an animation of the change over time is also available.

Main characteristics are listed below:
Temporal coverage of beach litter official monitoring: 2001-2020;
Temporal coverage of beach litter other sources: 2012-2020;
Temporal coverage of seafloor litter: 2006 to 2021;
Temporal resolution: annual;
Available to download as: Shapefile;
Web services: WFS

Map Viewer

Map Viewer allows users to browse, interact and visualize all maps. It gives access to the on-line visualization of the products. The HELP tab provides practical information about the characteristics and functionalities of the system.

Catalogue service

Browsing the product catalogue allows users to search for one or more available products as well as the related data collections. Users can also retrieve the full set of metadata, originators and distributors. The catalogue is integrated with the Map viewer, is compliant with ISO19139 metadata standards and fulfils INSPIRE Directive requirements.

webODV data explorer

For eutrophication, ocean acidification and contaminants the webODV data explorer tool allows users to easily create different kinds of graphics and products for visualizing data distributions

  • along a ship track (section), as shown in the right figure below
  • on constant depth surfaces, as shown in the central figure below
  • along the track of drifting profiling floats, as shown in the left figure below

All information are available via the dedicated tutorial video and the user manual webODV Data Explorer HowTo