Chemistry

Data & products on marine water quality

Ocean Acidification

In recent decades, ocean acidification has been occurring 100 times faster than over the past 55 million years ( European Environment Agency, 2020), threatening marine ecosystems with different pressures. For this reason, the ocean acidification is widely included in the European Integrated Maritime Policy.

EMODnet Chemistry Portal can give a valuable scientific contribution to the European environmental strategies, providing free and open access to data and data products on ocean acidification in seawater from all EU basins.

The data sets included in the Portal concern the parameters listed below:
  • Alkalinity, acidity and pH of the water column;
  • Carbonate chemistry in sediment pore waters;
  • Partial pressure (pCO2) and fugacity (fCO2) of carbon dioxide in the water column;
  • Total dissolved inorganic carbon (TCO2) concentration in the water column.

The Measurement data, as delivered by the originators, are accessible through the Data Discovery and Access Service. The Service provides relevant metadata, including identifier, data originator and data holding center for all datasets. The data can be downloaded depending on the specific sharing policy (public, restricted, moratorium...) applied by the originator, after user registration and shopping request.

Data collections of standardised, harmonised and validated datasets are available for six sea regions, as shown in the figure on the right. Each regional data collection is accessible through a digital object identifier. The aggregated data are available in ODV csv spreadsheet format, which can be easily handled and visualised with ODV Software. Multiple parameter codes (P01 terms) and associated standard units (P06 terms) are automatically aggregated and standardized by using the EMODnet Chemistry P35 vocabulary.

All datasets have been submitted to a step by step aggregation process. Firstly, they have been prepared and validated using ODV tools. Secondly, data harmonisation and quality assessment have been undertaken per region. Users can find the whole process in the User Manual for aggregated datasets of eutrophication_and ocean acidification.

Visualization products are available through the Map Viewer. The HELP tab provides practical information about the characteristics and functionalities of the system.

The products named Plots firstly display location of sampling stations for a single parameter and give information on the number of observations. These maps can be customized selecting both depth and time ranges. Secondly, the maps give access to dynamic plots, time series or vertical profiles, by clicking on the dots representing the sampling stations (figure below on the right). Users can easily customize the plots as well.

In addition, the regionally aggregated collections of data for ocean acidification are accessible through the Catalogue Service where users can also retrieve the full set of metadata, originators and distributors.

EMODnet Chemistry is not responsible of the use of the data and products by third-parties. Users are requested to ensure proper acknowledgment of the EMODnet Chemistry project and the data originators.