• 2022 August 30 18:08

    Aerial surveillance and regional cooperation remain key in detecting oil spills in the Baltic Sea - HELCOM

    Last year, 52 harmful spills of mineral oil were detected in HELCOM countries’ waters, according to the Annual report on discharges observed during aerial surveillance in the Baltic Sea 2021. The long-term decreasing trend is remarkable, as in the starting year of aerial surveillance of spills in 1989, 763 pollution occurrences were reported, according to HELCOM.

    “The decreasing number of harmful spills in the Baltic is likely a re­sult of intensive aerial surveillance, even if the density of shipping has grown. It acts as a deterrent, as the vessels are aware that they are constantly being watched”, comments Markus Helavuori, Professional Secretary of HELCOM.

    Over the years, the aerial surveil­lance activity in the countries has substantially improved. For example, the remote sensing equipment on board air­crafts and satellite surveillance is in good use to enable bigger area coverage and optimization of flights effectiveness. While in 2021, staff absence caused by covid-19 and technical reasons caused a dip in the annual flight hours, overall, the high number of annual flight hours has been maintained.

    Aerial surveys of oil spills have been carried out by Contracting Parties of HELCOM with standardized methods for several years, covering nearly the entire Baltic Sea. That is why it has been a substantial part of the HELCOM indicator on oil spills affecting the marine environment and, the confidence of the indicator evaluation has been considered high. The update of all HELCOM indicators will soon be finished as they form an elementary part of the next Holistic Assessment of the Baltic Sea (HOLAS 3), to be released in 2023.

    Collecting data on the frequency, size and nature of such spills is essential to understanding the environmental impacts of different kinds of substances on the Baltic Sea. Out of the 52 mineral oil spills identified in the Baltic Sea by air in 2021, the overwhelming majority (98%) were smaller than one cubic metre (1 m3) – small sizes of detected spills being another long-standing trend.

    An interactive data visualization dash­board has been developed by the HEL­COM Secretariat to offer users a more open and analytical view into the aerial surveil­lance dataset. This dashboard presents data on detected spills of mineral oil in the Baltic Sea from 1998 until 2021. Reporting on spills of other substances and un­known substances is also included from 2014 onwards. The dashboard has been developed using ‘Power BI’ a data visualization software by Microsoft.

    The dashboard is interactive meaning that users can filter data based on fields of interest. Users can drill-down into the dataset by simply selecting a data field via the visual, dropdown, or map.

    Currently coordinated by the HELCOM Informal Working Group on Aerial Surveillance (IWGAS), the surveillance of spills started in 1989 to detect spills of mineral oil. Since 2014, spills of other and unknown substances have been added to the reporting, among them garbage, litter and floating objects. Spills of unidentified chemical substances and novel fuel types warrant particular attention with regard to improving detection and response capabilities, especially in light of higher risks for accidents as a result of increased marine traffic and extreme weather conditions due to climate change.

    Through the Helsinki Convention (Article 14, Annex VII, Regulation 7), the HELCOM Contracting Parties – the nine Baltic countries and the European Union – have agreed to monitor pollution incidents and spills, making “necessary assessments of the situation and [taking] adequate response action in order to avoid or minimize subsequent pollution effects.”

    The HELCOM Recommendation 34E/4 further advises to monitor the whole of the Baltic Sea area with regular airborne surveillance, to develop and improve the existing remote sensing systems, and to coordinate surveillance activities which take place outside territorial waters.




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