HELCOM Hosts Experts Network on Underwater Noise

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Suppressing harmful underwater noise in the Baltic Sea tops the agenda of the HELCOM Pressure group this week, as the practical work for creating a regional register of impulsive sounds kick-starts.

The occurrence of such abrupt sounds, challenging to measure, is planned for national reporting in a jointly agreed manner, and the register contributes to the overall task of minimizing the negative impact of underwater noise on marine life.

Representatives of scientific and policy institutions from the Baltic littoral states will take part in the 3-day Pressure group meeting, held in Copenhagen, Denmark, to review and assess the impact of pressures mainly from input of hazardous substances and nutrients, littering of marine environment and dredging activities. The Meeting will be chaired by Lars Sonesten from the Swedish University of Agricultural Sciences.​

The Meeting follows up on the commitment to set up the impulsive sound register by the end of 2016, along with other noise management measures, as agreed by the HELCOM 2013 Ministerial Meeting. The new HELCOM Experts Network on Underwater Noise is about to start hands-on activities, the topmost goal being a Roadmap to building a knowledge base on underwater noise. The Network will prepare the short term Roadmap for 2015–17 and look after its implementation. Moreover, the Meeting will review the ongoing work to prepare a region-wide HELCOM indicator for ambient noise, referring to continuous low frequency anthropogenic sound.

As the biotopes of the Baltic seafloor are negatively affected by several human activities such as dredging, construction, fishing with bottom contact fishing gear and extraction of sand and gravel, the Meeting will inspect the latest concerned information submitted by the countries. An updated report on disposal of dredged material at sea for 1999–2013 has been submitted for the Meeting, which is invited to identify any hindrances for reporting comprehensive and reliable information in due time.

The packed agenda of the Meeting will, among others, also address several sites which have been proposed for deletion from the HELCOM Hot Spot list. The four suggested Hot Spots, aka significant pollution sites in the Baltic Sea region, concern the following Polish sites: Plaszow waste water treatment plant (WWTP) in Krakow; left-bank WWTP in Poznan; Czajka, Poludnie and Pancerz WWTPs in Warsaw; and Hajdow WWTP in Lublin.

Other points of consideration of the Meeting include marine litter and the progress in implementation of the recently adopted Regional Action Plan; further development of the HELCOM Recommendation on sewage sludge handling; and reviewing the priority hazardous substances which are to be assessed by HELCOM in the future.

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