The data and resulting data products (tables, figures and maps) available on the indicator web page can be used freely given that the source is cited. The indicator should be cited as following:
HELCOM (2018) Total nitrogen. HELCOM core indicator report. Online. [Date Viewed], [Web link].
Result: Total Nitrogen (TN)
Data source: The average for 2011-2016 was estimated using monitoring data provided by the HELCOM Contracting Parties, and kept in the HELCOM COMBINE database, hosted by ICES (www.ices.dk). Nominated members of HELCOM STATE & CONSERVATION group were given the opportunity to review the data, and to supply any missing monitoring observations, in order to achieve a complete dataset.
Description of data: The data includes total nitrogen observations, determined as explained in the HELCOM COMBINE manual. Measurements made at the depth of 0 – 10 m from the surface were used in the assessment.
Temporal coverage: The raw data includes observations throughout the year, during the assessment period 2011-2016. For the summer average, observations taken during June-September were included only.
Data aggregation: The 2011-2016 averages for each sub-basin were produced as an inter-annual estimates using observations from all months / June-September.