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Kattegat

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  • The national monitoring program is financed by the Swedish Agency for Marine and Water Management. Monitoring is performed by the Swedish Museum of Natural History. Data are stored in the Swedish Ocean Archive (SHARK) by the Swedish Meteorological and Hydrological Institute (SMHI). Information about the program and the methods are available in Swedish at the website of Swedish Agency for Marine and Water Management, https://www.havochvatten.se/overvakning-och-uppfoljning/miljoovervakning/marin-miljoovervakning/tumlare.html

  • Beach litter monitoring data from the Swedish coastline of Kattegat, the Sound and the Baltic Sea

  • The dataset entails the maritime spatial plan of Denmark that was adopted on September 29 2023.

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    This visualization product displays the density of floating micro-litter per net normalized per km² per year from specific protocols different from research and monitoring protocols. EMODnet Chemistry included the collection of marine litter in its 3rd phase. Before 2021, there was no coordinated effort at the regional or European scale for micro-litter. Given this situation, EMODnet Chemistry proposed to adopt the data gathering and data management approach as generally applied for marine data, i.e., populating metadata and data in the CDI Data Discovery and Access service using dedicated SeaDataNet data transport formats. EMODnet Chemistry is currently the official EU collector of micro-litter data from Marine Strategy Framework Directive (MSFD) National Monitoring activities (descriptor 10). A series of specific standard vocabularies or standard terms related to micro-litter have been added to SeaDataNet NVS (NERC Vocabulary Server) Common Vocabularies to describe the micro-litter. European micro-litter data are collected by the National Oceanographic Data Centres (NODCs). Micro-litter map products are generated from NODCs data after a test of the aggregated collection including data and data format checks and data harmonization. A filter is applied to represent only micro-litter sampled according to a very specific protocol such as the Volvo Ocean Race (VOR) or Oceaneye. Densities were calculated for each net using the following calculation: Density (number of particles per km²) = Micro-litter count / (Sampling effort (km) * Net opening (cm) * 0.00001) When the number of microlitters or the net opening was not filled, the density could not be calculated. Percentiles 50, 75, 95 & 99 have been calculated taking into account data for all years. Warning: the absence of data on the map doesn't necessarily mean that they don't exist, but that no information has been entered in the National Oceanographic Data Centre (NODC) for this area.

  • Beach litter monitoring data from Kattegat, the SOund and the Blatic Sea

  • In relation to Danish MSFD monitoring the data maps microplastics content in sediments in Danish waters. Data covers 13 sediment samples from the Belt Sea and its fjords, Kattegat and Limfjord. The samples were taken in 2018-2021 and analyzed in 2020-2021. A study of variation of microplastics over short distances, consisting of 13 sediment samples taken in a grid in Odense Fjord in 2021. The survey showed that microplastic could be found in all sediment samples in concentrations ranging from 22 to 7402 µg kg-1 (microgram microplastic per kg sediment dry matter). As number of microplastic particles, this corresponded to between 508 and 23340 N kg-1 (number of microplastics per kg of sediment dry matter) Odense Fjord showed that the microplastic content at this locality varied greatly. The average mass concentration was 4683 µg kg-1 with a range from 250 to 24848 µg kg-1 . Measured as a number, the concentration averaged 18671 N kg-1 with a range from 7266 to 34141 N kg-1 .

  • Microlitter was sampled with a module fitted on a Ferry Box system on the commercial ferry cruises (M/S Color Line Fantasy) between Oslo and Kiel. The system acquired samples in the Danish part of the Skagerrak and Kattegat. In total seven samples were collected from 23-10-2020 to 02-11-2020 using filters of mesh sizes of 300 and 500 µm. Particles were visually identified and analysed for chemical composition using FTIR. Particle concentrations ranged from 0.39 to 1.85 particles per m3 (average 0.91 per m3).

  • In a pilot study, microlitter was sampled with a Ferry Box system on the commercial ferry (M/S Color Line Fantasy) between Oslo and Kiel. The system acquired samples in the Danish part of the Skagerrak and Kattegat. In total thirteen samples were collected from September 2019 to February 2020 using mesh sizes 100 and 500 µm. Eleven samples were successfully processed. The samples were subsequently processed and analysed for chemical composition using FTIR. Microplastic amounts found ranged from 0 to 1.85 fragments or fibers per m3 (average 0.71 per m3).

  • Beach litter monitoring data from Kattegat, the Sound and the Baltic Sea

  • Contents and composition of microplastic-like particles have been analysed in ten sediment samples from the Danish part of the open North Sea and in the Inner Danish waters in 2015. The contents of microplastic-like particles in the size range 100-5000 µm were determined to be in the range of 192-3511 particles per kg dry weight sediment, dominated by blue and black coloured particles, mainly as fibres, and particle sizes < 300 µm were dominating.