Dataset description:

This dataset contains data on water flows, actual waterborne (riverine plus direct) inputs and atmospheric deposition of nutrients. Furthermore, it includes normalized total (atmospheric and waterborne) inputs of nitrogen and phosphorus into the Baltic Sea. The data are used in the HELCOM core indicator of nutrient inputs (nitrogen and phosphorus) to the Baltic Sea marine ecosystem (Inputs of nutrients - HELCOM indicators).

The data is presented in the format of MS Excel workbook consisting of 3 sheets. Sheets of nitrogen inputs and phosphorus inputs integrate 4 tables each. These tables contain time series, starting from 1995, of assessed nutrient input values: waterborne actual (riverine+direct), atmospheric deposition (actual), total actual input (air+water), normalize total input (air+water). Nitrogen and phosphorus inputs are assessed for the following Baltic Sea sub-basins: Bothnian Bay (BOB), Bothnian Sea (BOS), Baltic Proper (BAP), the Gulf of Finland (GUF), the Gulf of Riga (GUR), Danish Straights (DS), Kattegat (KAT) and the whole Baltic Sea (BAS). All input data is given in tonnes per year (tonnes/year).

The Flow sheet contains only one table with an annual water flow data time-series for each sub-basin of the Baltic Sea given in cubic meters per year (m3/s).

The river input data is based on riverine monitoring data and estimation of loads from unmonitored areas by countries in the frame of national monitoring programs. Data on waterborne inputs and water flow is reported by Contracting Parties to the PLC-Water database. The data are verified and quality assured using the PLC water database verification tools and national expert quality assurance.

Atmospheric deposition of nitrogen for all Baltic Sea sub-basins is computed using the latest version of EMEP MSC-W model and data on official emissions reported by EMEP Contracting Parties.

Dataset content:

Excel workbook contains the following sheets:

Nitrogen inputs – time-series of waterborne actual (riverine+direct), atmospheric deposition (actual), total actual input (air+water), normalized total input (air+water) (tonnes/year) .

Phosphorus inputs – time-series of waterborne actual (riverine+direct), atmospheric deposition (actual), total actual input (air+water), normalized total input (air+water) (tonnes/year).

flow - annual water flow data time-series (m3/s).

Visualization:

MS Excel workbook.

Data update:

Metadata is updated by HELCOM Secretariat annually after adoption of indicator report.

The dataset is updated by HELCOM Secretariat annually after adoption of indicator report.