The open-sea core indicators are updated using data reported by Contracting Parties to the HELCOM COMBINE database hosted by ICES, using the algorithms developed for the eutrophication assessment work flow. The reporting values are collated based on the indicators specifications shown in Assessment protocol table 1 (see HELCOM Eutrophication assessment manual).
Assessment protocol table 1. Specifications for the DIP indicator.
The core indicator is applicable in the 17 open sea assessment units (at least one nautical mile seawards from the baseline). In the coastal units the indicator is assessed using comparable indicators developed nationally for the purposes of assessments under the EU Water Framework Directive.
The assessment units are defined in the HELCOM Monitoring and Assessment Strategy Annex 4.