Thresholds and Status evaluation

Status evaluation is measured in relation to scientifically based and commonly agreed sub-basin specific threshold value, which defines the concentration that should not be exceeded (Thresholds figure 1).

DIP thresholds figure.png

Thresholds figure 1. Schematic representation of the threshold values applied in the DIP core indicator, the threshold values are assessment unit specific (see Thresholds table 1).


These indicator threshold values were based on the results obtained in the TARGREV project (HELCOM 2013a), also taking advantage of the work carried out during the EUTRO PRO process (HELCOM 2009) and national work for EU WFD. The final threshold values were set through an expert evaluation process done via intersessional activity for the development of core eutrophication indicators (HELCOM CORE EUTRO), and the targets were adopted by the HELCOM Heads of Delegations 39/2012.


Thresholds table 1. Assessment unit specific threshold values for the DIP core indicator.

HELCOM_IDAssessment unit (open sea)Threshold value (μmol l−1)
SEA-002Great Belt0.59
SEA-003The Sound0.42
SEA-004Kiel Bay0.57
SEA-005Bay of Mecklenburg0.49
SEA-006Arkona Basin0.36
SEA-007Bornholm Basin0.30
SEA-008Gdansk Basin0.36
SEA-009Eastern Gotland Basin0.29
SEA-010Western Gotland Basin0.33
SEA-011Northern Baltic Proper0.25
SEA-012Gulf of Riga0.41
SEA-013Gulf of Finland0.59
SEA-014Åland Sea0.21
SEA-015Bothnian Sea0.19
SEA-016The Quark0.10
SEA-017Bothnian Bay0.07