Baltic Sea - Eutrophication and Acidity aggregated datasets 1902/2022 v2023

EMODnet Chemistry aims to provide access to marine chemistry datasets and derived data products concerning eutrophication, acidity and contaminants. The importance of the selected substances and other parameters relates to the Marine Strategy Framework Directive (MSFD). This aggregated dataset contains all unrestricted EMODnet Chemistry data on eutrophication and acidity, and covers the Baltic Sea. Data were aggregated and quality controlled by "Swedish Meteorological and Hydrological Institute (SMHI)" in Sweden.
ITS-90 water temperature and water body salinity variables have also been included ('as are') to complete the eutrophication and acidity data. If you use these variables for calculations, please refer to SeaDataNet for the quality flags: https://www.seadatanet.org/Products/Aggregated-datasets.
Regional datasets concerning eutrophication and acidity are automatically harvested, and the resulting collections are aggregated and quality controlled using ODV Software and following a common methodology for all sea regions ( https://doi.org/10.13120/8xm0-5m67). Parameter names are based on P35 vocabulary, which relates to EMODnet Chemistry aggregated parameter names and is available at: https://vocab.nerc.ac.uk/search_nvs/P35/.
When not present in original data, water body nitrate plus nitrite was calculated by summing all nitrate and nitrite parameters. The same procedure was applied for water body dissolved inorganic nitrogen (DIN), which was calculated by summing all nitrate, nitrite, and ammonium parameters. Concentrations per unit mass were converted to a unit volume using a constant density of 1.25 kg/L.
The aggregated dataset can also be downloaded as an ODV collection and spreadsheet, which is composed of a metadata header followed by tab separated values. This spreadsheet can be imported to ODV Software for visualisation (more information can be found at: https://www.seadatanet.org/Software/ODV).

欧洲海洋观测与数据网络化学分部（EMODnet Chemistry）旨在提供与富营养化、海洋酸化及污染物相关的海洋化学数据集与衍生数据产品的访问服务。所选物质及其他参数的重要性与《海洋战略框架指令（Marine Strategy Framework Directive, MSFD）》密切相关。本聚合数据集涵盖了波罗的海海域内所有不受限制的EMODnet Chemistry富营养化与酸化相关数据。该数据集由瑞典气象与水文研究所（Swedish Meteorological and Hydrological Institute, SMHI）完成数据聚合与质量控制。
国际温标ITS-90下的水温与水体盐度变量也已纳入数据集（保留原始格式），以完善富营养化与酸化相关数据。若您需使用这些变量开展计算，请参考SeaDataNet的质量标记规范：https://www.seadatanet.org/Products/Aggregated-datasets。
针对富营养化与酸化的区域数据集将自动采集，所得数据集集合将通过ODV软件完成聚合与质量控制，并遵循适用于所有海域的统一方法（https://doi.org/10.13120/8xm0-5m67）。参数名称基于P35词汇表制定，该词汇表对应EMODnet Chemistry聚合参数命名规范，可通过以下链接获取：https://vocab.nerc.ac.uk/search_nvs/P35/。
若原始数据中未包含水体硝态氮与亚硝态氮总量，则通过合并所有硝态氮与亚硝态氮参数值进行计算。水体溶解无机氮（Dissolved Inorganic Nitrogen, DIN）的计算采用相同流程：通过合并所有硝态氮、亚硝态氮与铵态氮参数值得到总量。所有单位为质量浓度的数值均通过固定密度1.25 kg/L转换为体积浓度。
本聚合数据集还可作为ODV数据集集合与电子表格下载，电子表格包含元数据表头与制表符分隔的数值内容。该电子表格可导入ODV软件进行可视化展示（更多信息可访问：https://www.seadatanet.org/Software/ODV）。