Memo of the on-line meeting of the HELCOM EN-Marine Litter (30 May 2017)

Transcription

1 Memo of the on-line meeting of the HELCOM EN-Marine Litter (3 May 217) A working meeting of the HELCOM EN-Marine Litter was held on 3 May 217 as an online meeting. The list of participants is contained in Annex 1. The aim of the Meeting is to share and discuss on-going and future work on marine litter in the frame of HELCOM SPICE as well as continue the discussion on the treatment of national data to identify top beach litter items. The meeting may also want to exchange their views in relation to the upcoming meeting of the MSFD TG ML to be held on 8-9 June 217, in Gdansk (Poland). On-going and future work on marine litter in the frame of HELCOM SPICE: beach litter The Meeting took note of two documents prepared by Poland. The first one presenting a draft report on the analysis of national beach litter monitoring data (Annex 2). The second one containing a proposal for establishing beach litter baselines at different spatial scales (i.e. regional, sub-basin and national) (Annex 3). The Meeting took note of the views by Poland of not using the period as the temporal scale for the regional baseline due to lack of data, but the period instead. The Meeting noted that there is no official Danish position on these two documents. However, Denmark suggested that HELCOM focus on establishment/regional input to the establishment of scientifically well founded and statistically robust baselines. Denmark hopes to aim for increased harmonization of the HELCOM monitoring of beach litter in the future. According to the new MSFD GES decision the threshold values for marine litter should be established through cooperation at the EU level. At present Denmark is therefore of the understanding that this division of work should be taken into account and it would probably also be very difficult for Denmark to support environmental targets for marine litter in HELCOM as long the EU work has not finished. The Meeting noted further the Danish suggestion not to use linear regression for the analysis of data but the logarithmic one as it is done when analysing contaminants. The Meeting noted the views by Poland that it would not be appropriate to use the same approach as with contaminants since there are not long data series available of beach litter data. The Meeting took note that is the poorest data period for Estonia and that they would propose to use the period instead. The Meeting agreed that Poland will circulate compiled national data for verification by the HELCOM EN-Marine Litter by 6 June 217. The Meeting noted that cigarette butts are counted within 1 m when using the MARLIN methodology for quantification and the number is multiplied with 1 for the unit per 1 m. The Meeting noted that data correction for cigarette butts has been conducted and that this correction may increase the registered amounts of artificial polymer materials. This situation would apply to all countries using the MARLIN methodology for quantification of cigarette butts (Estonia, Finland, Latvia and Sweden). The Meeting recalled that the current version of the pre-core indicator report on beach litter (STATE & CONSERVATION 5-216, document 4J-27) contains, among others, the following specifications regarding the monitoring methodology proposed to be used regionally: 1. Three sampling campaigns during the year, preferably in April-May, July-August and October-November have to be organised. Information from these three sampling campaigns will be used for the beach litter assessment. If it is possible, according to national climatological conditions a forth campaign is to be Page 1 of 3

2 conducted during winter time. Information from this forth campaign, when available, will be included separately in the assessment (i.e. different colours on map representations); 2. Type of beaches to be sampled: a) In principle only beaches without any cleaning should be used. Beaches that are cleaned daily or more frequently should not be included in the monitoring programme; b) It is recommended that at least one beach in the monitoring programme is not included in the regular cleaning process and is frequented by few visitors to serve as reference beach, e.g. within a nature sanctuary or a military area. A description of the beaches to be sampled is to be provided, including information on distance from harbours and cities, usage intensity/number of visitors, date of the last cleaning and frequency of the cleaning process; Data collected from beaches cleaned more frequently than once per day may be relevant for further national considerations. The Meeting recalled that Demark, Estonia, Finland, Latvia and Sweden do not conduct monitoring in winter time. The Meeting agreed that specific mentioning in the report will be made in relation to the influence of lack of monitoring in winter on the results of the following monitoring in spring. The Meeting agreed to provide comments to the two documents by 15 June, including the approach followed to analyse the data. The Meeting also agreed that based on the feedback received the SPICE draft report will be further elaborated and finished by the end of June 217. On-going and future work on marine litter in the frame of HELCOM SPICE: microlitter The Meeting took note of the draft report on information collected on microlitter as prepared by Finland (Annex 4). The Meeting noted that further work on the draft report is to be conducted to include a map where data is available. The Meeting agreed to provide comments to the document by 15 June. The Meeting took note of the views by Denmark that there is a need for harmonization and standardization of monitoring methods and guidelines for microliter. However, it is to bear in mind that since GES thresholds are to be established through coordination at EU level, some level of EU coordination will also be optimal for the monitoring. Since Denmark is a member of both OSPAR and HELCOM Denmark would very much appreciate a closer cooperation between OSPAR and HELCOM regarding the development of microlitter indicators. The Meeting noted that as part of the HELCOM SPICE project a workshop on microlitter is to be held on 7-8 November 217, in Helsinki. The aim of the workshop is to discuss the results achieved through Theme 2 of the SPICE project. The focus of the workshop: microlitter, from sampling environments (i.a. water surface, water column, sediment, biota), to options for sampling (i.a. manta trawl, Baby-Bongo net, box core) and analytical methods (i.a. stereo microscopy, Raman, FTIR, chemical digestion, enzyme digestion). Upcoming meeting of the MSFD TG ML The Meeting noted that the next meeting of the MSFD TG ML is to be held on 8-9 June 217, in Gdansk (Poland). The Meeting noted the views by Germany that it is a good opportunity to see the approach on baselines definition followed by OSPAR. Future work The Meeting agreed to hold the next meeting of the HELCOM EN-Marine Litter as an on-line meeting in August (date tbc before the summer break), where among other issues the drafting of guidelines for beach litter monitoring for their submission to STATE & CONSERVATION will be discussed. Page 2 of 3

3 Annex 1 List of Participants Dennis Gräwe State Agency for Environment, Nature Conservation and Geology, Mecklenburg-Vorpommern (LUNG M-V) Poland Wlodzimierz Krzyminski Institute of Meteorology and Water Management, National Research Institute Tamara Zalewska Institute of Meteorology and Water Management - National Research Institute, Maritime Branch Name Organisation address Denmark Jakob Strand Aarhus University, Department of Bioscience jak@dmu.dk Estonia Marek Press Keep the Estonian Sea Tidy Association press@datanet.ee Finland Outi Setälä Finnish Environment Institute, SYKE outi.setala@ymparisto.fi Germany Elke Fischer University of Hamburg elke.fischer@unihamburg.de dennis.graewe@lung.mvregierung.de Wlodzimierz.krzyminski@i mgw.pl Tamara.Zalewska@imgw.p l Sweden Eva Blidberg Keep Sweden Tidy Eva.Blidberg@hsr.se HELCOM Secretariat Marta Ruiz HELCOM Secretariat Marta.Ruiz@helcom.fi Page 3 of 3

4 Annex 2 Draft report on the analysis of national beach litter monitoring data Report of beach litter baselines analysis The data for the analysis comes from monitoring carried out by Baltic Sea countries (Tab. 1). The monitoring sites in each country were assigned to the relevant sub-basins (coastal areas at level 3) indicated as areas recommended by the HELCOM Monitoring and Assessment Strategy. The basic unit used for the calculations is the number of items in each category per 1 m (it could be called as the frequency of marine litter items per 1 m in each category and total number). If the monitoring is conducted on a different than 1 meters long section, then the data is converted to 1m. Such solution allows to compare results from different periods and locations. Table 1 Spatial (countries and HELCOM sub-basins) and temporal (years) information on data applied for beach litter baselines analysis Country HELCOM sub-basin Years Danmark Arkona Basin Danish Coastal waters Kattegat Danish Coastal waters Estonia Gulf of Riga Estonian Coastal waters Gulf of Finland Estonian Coastal waters Northern Baltic Proper Finnish Coastal waters Finland Gulf of Finland Finnish Coastal waters Bothnian Bay Finnish Coastal waters Arkona Basin German Coastal waters Germany Mecklenburg Bight German Coastal waters Bornholm Basin German Coastal waters Latvia Gulf of Riga Latvian Coastal waters Lithuania Eastern Gotland Basin Lithuanian Coastal waters Eastern Gotland Basin Polish Coastal waters Poland Bornholm Basin Polish Coastal waters Gdansk Basin Polish Coastal waters The Sound Swedish Coastal waters Western Gotland Basin Swedish Coastal waters Bornholm Basin Swedish Coastal waters Sweden Northern Baltic Proper Swedish Coastal waters Arkona Basin Swedish Coastal waters Bothnian Bay Swedish Coastal waters Eastern Gotland Basin Swedish Coastal waters Kattegat Swedish Coastal waters

5 Sweden Poland Lithuania Latvia Germany SUM Finland Estonia Denmark Mean number of items / 1m Fig. 5b Mean number of plastic items and sum of all categories/ 1m aggregated for countries Sweden Poland Lithuania Latvia Germany Finland Estonia Rubber Cloth/textile Paper/cardboard Processed/worked wood Glass/ceramics Unclassified Denmark Mean number of items / 1m Fig. 5b Mean number of items within categories/ 1m aggregated for countries

6 Sweden Poland Lithuania Latvia Germany Finland Estonia Rubber Cloth/textile Paper/cardboard Processed/worked wood Glass/ceramics Unclassified Denmark % 2% 4% 6% 8% 1% Fig. 6a Percentage of mean number of items within categories/ 1m aggregated for countries (with artificial polymer materials) Sweden Poland Lithuania Latvia Germany Finland Estonia Rubber Cloth/textile Paper/cardboard Processed/worked wood Glass/ceramics Unclassified Denmark % 2% 4% 6% 8% 1% Fig. 6b Percentage of mean number of items within categories/ 1m aggregated for countries (without artificial polymer materials)

7 14 12 Number of Items / 1 m Rubber Cloth/textile Paper/cardboard Processed/worked wood Metal Glass/ceramics Unclassified Spring Summer Autumn Winter Fig. 4a Mean number of items within categories/ 1m aggregated for whole the Baltic Sea vs. season Number of items / 1m Sum 2 Spring Summer Autumn Winter Fig. 4b Mean number of items within categories/ 1m aggregated for whole the Baltic Sea vs. season

8 Year Rubber Year Cloth/textile Year

9 Paper/cardboard Year Processed/worked wood Year Metal Year

10 Glass/ceramics Year Sum Year Fig. 2 Mean number of items within categories / 1m aggregated for whole the Baltic Sea vs. years (mean ± 95% confidence level)

11 22 2 APM: y = x; r = -.933, r 2 =.871, p =.25 SUM: y = x; r = -.932, r 2 =.869, p = Sum of all categories Mean Year Fig. 3a Mean number of items / 1m aggregated for whole the Baltic Sea vs. years statistical significance Mean number of items / 1m Rubber (p =.3253; r = -.561; r 2 =.315) Paper/carbord (p =.152; r = -.743; r 2 =.552) Processed/worked wood (p =.4314; r = -.464; r 2 =.215) Metal (p =.144; r = -.755; r 2 =.57) Glass/ceramics (p =.26; r = -.922; r 2 =.85) Cloth/textile (p =.32; r = -.913; r 2 =.834) Year Fig. 3b Mean number of items / 1m aggregated for whole the Baltic Sea vs. years statistical significance

12 Table 2 Results of statistical significance studies of changes in the number beach marine litter in the period p values below.5 indicate statistically significant decreasing trends Sub - basins Artificial polymer materials Rubber Cloth/textile p values below.5 Paper/ Cardboard Processing/ worked wood Metal Glass/ ceramics 4 Bornholm Basin German Coastal waters Bornholm Basin Swedish Coastal waters Bothnian Bay Swedish Coastal waters Eastern Gotland Basin Lithuanian Coastal waters Eastern Gotland Basin Swedish Coastal waters Gulf of Finland Estonian Coastal waters Gulf of Finland Finnish Coastal waters Gulf of Riga Estonian Coastal waters * Gulf of Riga Latvian national waters Kattegat Swedish Coastal waters Mecklenburg Bight German Coastal waters Northern Baltic Proper Finnish Coastal waters Northern Baltic Proper Swedish Coastal waters *increasing trend Sum

13 Table 3 Statistical results for all aggregated data within categories and sum, for whole the Baltic Sea area calculated for two periods: (1) and 2 ( ) Confidence Confidence Percentile Percentile Percentile Percentile Mean Minimum Maximum -95% +95% Rubber Cloth/textile Paper/cardboard Processed/worked wood Metal Glass/ceramics Sum

14 Table 4 Sub-basin aggregated statistical data calculated for artificial polymer materials for HELCOM_subasin_National Mean Confidence -95% Confidence +95% Minimum Maximum Percentile 1 Percentile 15 Percentile 25 Percentile 75 Arkona Basin Danish Coastal waters Kattegat Danish Coastal waters Gulf of Riga Estonian Coastal waters Gulf of Finland Estonian Coastal waters Northern Baltic Proper Finnish Coastal waters Gulf of Finland Finnish Coastal waters Bothnian Bay Finnish Coastal waters Arkona Basin German Coastal waters Mecklenburg Bight German Coastal waters Bornholm Basin German Coastal waters Gulf of Riga Latvian national waters Eastern Gotland Basin Polish Coastal waters Bornholm Basin Polish Coastal waters Gdansk Basin Polish Coastal waters The Sound Swedish Coastal waters Western Gotland Basin Swedish Coastal waters Bornholm Basin Swedish Coastal waters Northern Baltic Proper Swedish Coastal waters Arkona Basin Swedish Coastal waters Bothnian Bay Swedish Coastal waters Eastern Gotland Basin Swedish Coastal waters Kattegat Swedish Coastal waters

15 Table 5 Sub-basin aggregated statistical data calculated for cloth/textile for HELCOM_subasin_National Confidence Confidence Mean Minimum Maximum Percentile Percentile Percentile Percentile -95% +95% Arkona Basin Danish Coastal waters Kattegat Danish Coastal waters Gulf of Riga Estonian Coastal waters Gulf of Finland Estonian Coastal waters Northern Baltic Proper Finnish Coastal waters Gulf of Finland Finnish Coastal waters Bothnian Bay Finnish Coastal waters Arkona Basin German Coastal waters Mecklenburg Bight German Coastal waters Bornholm Basin German Coastal waters Gulf of Riga Latvian national waters Eastern Gotland Basin Polish Coastal waters Bornholm Basin Polish Coastal waters Gdansk Basin Polish Coastal waters The Sound Swedish Coastal waters Western Gotland Basin Swedish Coastal waters Bornholm Basin Swedish Coastal waters Northern Baltic Proper Swedish Coastal waters Arkona Basin Swedish Coastal waters Bothnian Bay Swedish Coastal waters Eastern Gotland Basin Swedish Coastal waters Kattegat Swedish Coastal waters

16 Table 6 Sub-basin aggregated statistical data calculated for glass/ceramics for HELCOM_subasin_National Confidence Confidence Mean Minimum Maximum Percentile Percentile Percentile Percentile -95% +95% Arkona Basin Danish Coastal waters Kattegat Danish Coastal waters Gulf of Riga Estonian Coastal waters Gulf of Finland Estonian Coastal waters Northern Baltic Proper Finnish Coastal waters Gulf of Finland Finnish Coastal waters Bothnian Bay Finnish Coastal waters Arkona Basin German Coastal waters Mecklenburg Bight German Coastal waters Bornholm Basin German Coastal waters Gulf of Riga Latvian national waters Eastern Gotland Basin Polish Coastal waters Bornholm Basin Polish Coastal waters Gdansk Basin Polish Coastal waters The Sound Swedish Coastal waters Western Gotland Basin Swedish Coastal waters Bornholm Basin Swedish Coastal waters Northern Baltic Proper Swedish Coastal waters Arkona Basin Swedish Coastal waters Bothnian Bay Swedish Coastal waters Eastern Gotland Basin Swedish Coastal waters Kattegat Swedish Coastal waters

17 Table 7 Sub-basin aggregated statistical data calculated for metal for HELCOM_subasin_National Confidence Confidence Mean Minimum Maximum Percentile Percentile Percentile Percentile -95% +95% Arkona Basin Danish Coastal waters Kattegat Danish Coastal waters Gulf of Riga Estonian Coastal waters Gulf of Finland Estonian Coastal waters Northern Baltic Proper Finnish Coastal waters Gulf of Finland Finnish Coastal waters Bothnian Bay Finnish Coastal waters Arkona Basin German Coastal waters Mecklenburg Bight German Coastal waters Bornholm Basin German Coastal waters Gulf of Riga Latvian national waters Eastern Gotland Basin Polish Coastal waters Bornholm Basin Polish Coastal waters Gdansk Basin Polish Coastal waters The Sound Swedish Coastal waters Western Gotland Basin Swedish Coastal waters Bornholm Basin Swedish Coastal waters Northern Baltic Proper Swedish Coastal waters Arkona Basin Swedish Coastal waters Bothnian Bay Swedish Coastal waters Eastern Gotland Basin Swedish Coastal waters Kattegat Swedish Coastal waters

18 Table 8 Sub-basin aggregated statistical data calculated for cardboard for HELCOM_subasin_National Mean Confidence - 95% Confidence +95% Minimum Maximum Percentile 1 Percentile 15 Percentile 25 Percentile 75 Arkona Basin Danish Coastal waters Kattegat Danish Coastal waters Gulf of Riga Estonian Coastal waters Gulf of Finland Estonian Coastal waters Northern Baltic Proper Finnish Coastal waters Gulf of Finland Finnish Coastal waters Bothnian Bay Finnish Coastal waters Arkona Basin German Coastal waters Mecklenburg Bight German Coastal waters Bornholm Basin German Coastal waters Gulf of Riga Latvian national waters Eastern Gotland Basin Polish Coastal waters Bornholm Basin Polish Coastal waters Gdansk Basin Polish Coastal waters The Sound Swedish Coastal waters Western Gotland Basin Swedish Coastal waters Bornholm Basin Swedish Coastal waters Northern Baltic Proper Swedish Coastal waters Arkona Basin Swedish Coastal waters Bothnian Bay Swedish Coastal waters Eastern Gotland Basin Swedish Coastal waters Kattegat Swedish Coastal waters

19 Table 9 Sub-basin aggregated statistical data calculated for processed/worked wood for HELCOM_subasin_National Mean Confidence Confidence Minimum Maximum Percentile Percentile Percentile Percentile -95% +95% Arkona Basin Danish Coastal waters Kattegat Danish Coastal waters Gulf of Riga Estonian Coastal waters Gulf of Finland Estonian Coastal waters Northern Baltic Proper Finnish Coastal waters Gulf of Finland Finnish Coastal waters Bothnian Bay Finnish Coastal waters Arkona Basin German Coastal waters Mecklenburg Bight German Coastal waters Bornholm Basin German Coastal waters Gulf of Riga Latvian national waters Eastern Gotland Basin Polish Coastal waters Bornholm Basin Polish Coastal waters Gdansk Basin Polish Coastal waters The Sound Swedish Coastal waters Western Gotland Basin Swedish Coastal waters Bornholm Basin Swedish Coastal waters Northern Baltic Proper Swedish Coastal waters Arkona Basin Swedish Coastal waters Bothnian Bay Swedish Coastal waters Eastern Gotland Basin Swedish Coastal waters Kattegat Swedish Coastal waters

20 Table 1 Sub-basin aggregated statistical data calculated for rubber for HELCOM_subasin_National Confidence Confidence Mean Minimum Maximum Percentile Percentile Percentile Percentile -95% +95% Arkona Basin Danish Coastal waters Kattegat Danish Coastal waters Gulf of Riga Estonian Coastal waters Gulf of Finland Estonian Coastal waters Northern Baltic Proper Finnish Coastal waters Gulf of Finland Finnish Coastal waters Bothnian Bay Finnish Coastal waters Arkona Basin German Coastal waters Mecklenburg Bight German Coastal waters Bornholm Basin German Coastal waters Gulf of Riga Latvian national waters Eastern Gotland Basin Polish Coastal waters Bornholm Basin Polish Coastal waters Gdansk Basin Polish Coastal waters The Sound Swedish Coastal waters Western Gotland Basin Swedish Coastal waters Bornholm Basin Swedish Coastal waters Northern Baltic Proper Swedish Coastal waters Arkona Basin Swedish Coastal waters Bothnian Bay Swedish Coastal waters Eastern Gotland Basin Swedish Coastal waters Kattegat Swedish Coastal waters

21 Table 11 Sub-basin aggregated statistical data calculated for sum of items for HELCOM_subasin_National Confidence Confidence Mean Minimum Maximum Percentile Percentile Percentile Upper -95% +95% Arkona Basin Danish Coastal waters Kattegat Danish Coastal waters Gulf of Riga Estonian Coastal waters Gulf of Finland Estonian Coastal waters Northern Baltic Proper Finnish Coastal waters Gulf of Finland Finnish Coastal waters Bothnian Bay Finnish Coastal waters Arkona Basin German Coastal waters Mecklenburg Bight German Coastal waters Bornholm Basin German Coastal waters Gulf of Riga Latvian national waters Eastern Gotland Basin Polish Coastal waters Bornholm Basin Polish Coastal waters Gdansk Basin Polish Coastal waters The Sound Swedish Coastal waters Western Gotland Basin Swedish Coastal waters Bornholm Basin Swedish Coastal waters Northern Baltic Proper Swedish Coastal waters Arkona Basin Swedish Coastal waters Bothnian Bay Swedish Coastal waters Eastern Gotland Basin Swedish Coastal waters Kattegat Swedish Coastal waters

22 Table 12 All yearly aggregated data within categories and sum Year Total Mean Confidence Confidence Sum Minimum Maximum Lower Upper Percentile Percentile Std.Dev. number of data number of items /1m -95% +95% quartile quartile Rubber Cloth/textile Paper/cardboard Processed/worked wood Metal Glass/ceramics Unclassified Sum Rubber Cloth/textile Paper/cardboard Processed/worked wood Metal Glass/ceramics Unclassified Sum Rubber Cloth/textile Paper/cardboard Processed/worked wood Metal Glass/ceramics Unclassified Sum Rubber

23 Year Total Mean Confidence Confidence Sum Minimum Maximum Lower Upper Percentile Percentile Std.Dev. number of data number of items /1m -95% +95% quartile quartile 15 9 Cloth/textile Paper/cardboard Processed/worked wood Metal Glass/ceramics Unclassified Sum Rubber Cloth/textile Paper/cardboard Processed/worked wood Metal Glass/ceramics Unclassified Sum

24 Table 13 All aggregated data by sub-basins within categories and sum Mean Total number Lower Upper Percentile Percentile HELCOM_subasin_National number Sum Min Max of items quartile quartile 15 9 of data /1m Arkona Basin Danish Coastal waters Rubber Arkona Basin Danish Coastal waters Cloth/textile Arkona Basin Danish Coastal waters Paper/cardboard Arkona Basin Danish Coastal waters Processed/worked wood Arkona Basin Danish Coastal waters Metal Arkona Basin Danish Coastal waters Glass/ceramics Arkona Basin Danish Coastal waters Unclassified Arkona Basin Danish Coastal waters Sum Arkona Basin Danish Coastal waters Kattegat Danish Coastal waters Rubber Kattegat Danish Coastal waters Cloth/textile Kattegat Danish Coastal waters Paper/cardboard Kattegat Danish Coastal waters Processed/worked wood Kattegat Danish Coastal waters Metal Kattegat Danish Coastal waters Glass/ceramics Kattegat Danish Coastal waters Unclassified Kattegat Danish Coastal waters Sum Kattegat Danish Coastal waters Gulf of Riga Estonian Coastal waters Rubber Gulf of Riga Estonian Coastal waters Cloth/textile Gulf of Riga Estonian Coastal waters Paper/cardboard Gulf of Riga Estonian Coastal waters Processed/worked wood Gulf of Riga Estonian Coastal waters Metal Gulf of Riga Estonian Coastal waters Glass/ceramics Gulf of Riga Estonian Coastal waters Unclassified Gulf of Riga Estonian Coastal waters Sum Gulf of Riga Estonian Coastal waters Gulf of Finland Estonian Coastal waters Rubber Gulf of Finland Estonian Coastal waters

25 Mean Total number Lower Upper Percentile Percentile HELCOM_subasin_National number Sum Min Max of items quartile quartile 15 9 of data /1m Cloth/textile Gulf of Finland Estonian Coastal waters Paper/cardboard Gulf of Finland Estonian Coastal waters Processed/worked wood Gulf of Finland Estonian Coastal waters Metal Gulf of Finland Estonian Coastal waters Glass/ceramics Gulf of Finland Estonian Coastal waters Unclassified Gulf of Finland Estonian Coastal waters Sum Gulf of Finland Estonian Coastal waters Northern Baltic Proper Finnish Coastal waters Rubber Northern Baltic Proper Finnish Coastal waters Cloth/textile Northern Baltic Proper Finnish Coastal waters Paper/cardboard Northern Baltic Proper Finnish Coastal waters Processed/worked wood Northern Baltic Proper Finnish Coastal waters Metal Northern Baltic Proper Finnish Coastal waters Glass/ceramics Northern Baltic Proper Finnish Coastal waters Unclassified Northern Baltic Proper Finnish Coastal waters Sum Northern Baltic Proper Finnish Coastal waters Gulf of Finland Finnish Coastal waters Rubber Gulf of Finland Finnish Coastal waters Cloth/textile Gulf of Finland Finnish Coastal waters Paper/cardboard Gulf of Finland Finnish Coastal waters Processed/worked wood Gulf of Finland Finnish Coastal waters Metal Gulf of Finland Finnish Coastal waters Glass/ceramics Gulf of Finland Finnish Coastal waters Unclassified Gulf of Finland Finnish Coastal waters Sum Gulf of Finland Finnish Coastal waters Bothnian Bay Finnish Coastal waters Rubber Bothnian Bay Finnish Coastal waters Cloth/textile Bothnian Bay Finnish Coastal waters Paper/cardboard Bothnian Bay Finnish Coastal waters Processed/worked wood Bothnian Bay Finnish Coastal waters Metal Bothnian Bay Finnish Coastal waters

26 Mean Total number Lower Upper Percentile Percentile HELCOM_subasin_National number Sum Min Max of items quartile quartile 15 9 of data /1m Glass/ceramics Bothnian Bay Finnish Coastal waters Unclassified Bothnian Bay Finnish Coastal waters Sum Bothnian Bay Finnish Coastal waters Arkona Basin German Coastal waters Rubber Arkona Basin German Coastal waters Cloth/textile Arkona Basin German Coastal waters Paper/cardboard Arkona Basin German Coastal waters Processed/worked wood Arkona Basin German Coastal waters Metal Arkona Basin German Coastal waters Glass/ceramics Arkona Basin German Coastal waters Unclassified Arkona Basin German Coastal waters Sum Arkona Basin German Coastal waters Mecklenburg Bight German Coastal waters Rubber Mecklenburg Bight German Coastal waters Cloth/textile Mecklenburg Bight German Coastal waters Paper/cardboard Mecklenburg Bight German Coastal waters Processed/worked wood Mecklenburg Bight German Coastal waters Metal Mecklenburg Bight German Coastal waters Glass/ceramics Mecklenburg Bight German Coastal waters Unclassified Mecklenburg Bight German Coastal waters Sum Mecklenburg Bight German Coastal waters Bornholm Basin German Coastal waters Rubber Bornholm Basin German Coastal waters Cloth/textile Bornholm Basin German Coastal waters Paper/cardboard Bornholm Basin German Coastal waters Processed/worked wood Bornholm Basin German Coastal waters Metal Bornholm Basin German Coastal waters Glass/ceramics Bornholm Basin German Coastal waters Unclassified Bornholm Basin German Coastal waters Sum Bornholm Basin German Coastal waters Gulf of Riga Latvian national waters

27 Mean Total number Lower Upper Percentile Percentile HELCOM_subasin_National number Sum Min Max of items quartile quartile 15 9 of data /1m Rubber Gulf of Riga Latvian national waters Cloth/textile Gulf of Riga Latvian national waters Paper/cardboard Gulf of Riga Latvian national waters Processed/worked wood Gulf of Riga Latvian national waters Metal Gulf of Riga Latvian national waters Glass/ceramics Gulf of Riga Latvian national waters Unclassified Gulf of Riga Latvian national waters Sum Gulf of Riga Latvian national waters Eastern Gotland Basin Lithuanian Coastal waters Rubber Eastern Gotland Basin Lithuanian Coastal waters Cloth/textile Eastern Gotland Basin Lithuanian Coastal waters Paper/cardboard Eastern Gotland Basin Lithuanian Coastal waters Processed/worked wood Eastern Gotland Basin Lithuanian Coastal waters Metal Eastern Gotland Basin Lithuanian Coastal waters Glass/ceramics Eastern Gotland Basin Lithuanian Coastal waters Unclassified Eastern Gotland Basin Lithuanian Coastal waters Sum Eastern Gotland Basin Lithuanian Coastal waters Eastern Gotland Basin Polish Coastal waters Rubber Eastern Gotland Basin Polish Coastal waters Cloth/textile Eastern Gotland Basin Polish Coastal waters Paper/cardboard Eastern Gotland Basin Polish Coastal waters Processed/worked wood Eastern Gotland Basin Polish Coastal waters Metal Eastern Gotland Basin Polish Coastal waters Glass/ceramics Eastern Gotland Basin Polish Coastal waters Unclassified Eastern Gotland Basin Polish Coastal waters Sum Eastern Gotland Basin Polish Coastal waters Bornholm Basin Polish Coastal waters Rubber Bornholm Basin Polish Coastal waters Cloth/textile Bornholm Basin Polish Coastal waters Paper/cardboard Bornholm Basin Polish Coastal waters Processed/worked wood Bornholm Basin Polish Coastal waters

28 Mean Total number Lower Upper Percentile Percentile HELCOM_subasin_National number Sum Min Max of items quartile quartile 15 9 of data /1m Metal Bornholm Basin Polish Coastal waters Glass/ceramics Bornholm Basin Polish Coastal waters Unclassified Bornholm Basin Polish Coastal waters Sum Bornholm Basin Polish Coastal waters Gdansk Basin Polish Coastal waters Rubber Gdansk Basin Polish Coastal waters Cloth/textile Gdansk Basin Polish Coastal waters Paper/cardboard Gdansk Basin Polish Coastal waters Processed/worked wood Gdansk Basin Polish Coastal waters Metal Gdansk Basin Polish Coastal waters Glass/ceramics Gdansk Basin Polish Coastal waters Unclassified Gdansk Basin Polish Coastal waters Sum Gdansk Basin Polish Coastal waters The Sound Swedish Coastal waters Rubber The Sound Swedish Coastal waters Cloth/textile The Sound Swedish Coastal waters Paper/cardboard The Sound Swedish Coastal waters Processed/worked wood The Sound Swedish Coastal waters Metal The Sound Swedish Coastal waters Glass/ceramics The Sound Swedish Coastal waters Unclassified The Sound Swedish Coastal waters Sum The Sound Swedish Coastal waters Western Gotland Basin Swedish Coastal waters Rubber Western Gotland Basin Swedish Coastal waters Cloth/textile Western Gotland Basin Swedish Coastal waters Paper/cardboard Western Gotland Basin Swedish Coastal waters Processed/worked wood Western Gotland Basin Swedish Coastal waters Metal Western Gotland Basin Swedish Coastal waters Glass/ceramics Western Gotland Basin Swedish Coastal waters Unclassified Western Gotland Basin Swedish Coastal waters Sum Western Gotland Basin Swedish Coastal waters

29 Mean Total number Lower Upper Percentile Percentile HELCOM_subasin_National number Sum Min Max of items quartile quartile 15 9 of data /1m Bornholm Basin Swedish Coastal waters Rubber Bornholm Basin Swedish Coastal waters Cloth/textile Bornholm Basin Swedish Coastal waters Paper/cardboard Bornholm Basin Swedish Coastal waters Processed/worked wood Bornholm Basin Swedish Coastal waters Metal Bornholm Basin Swedish Coastal waters Glass/ceramics Bornholm Basin Swedish Coastal waters Unclassified Bornholm Basin Swedish Coastal waters Sum Bornholm Basin Swedish Coastal waters Northern Baltic Proper Swedish Coastal waters Rubber Northern Baltic Proper Swedish Coastal waters Cloth/textile Northern Baltic Proper Swedish Coastal waters Paper/cardboard Northern Baltic Proper Swedish Coastal waters Processed/worked wood Northern Baltic Proper Swedish Coastal waters Metal Northern Baltic Proper Swedish Coastal waters Glass/ceramics Northern Baltic Proper Swedish Coastal waters Unclassified Northern Baltic Proper Swedish Coastal waters Sum Northern Baltic Proper Swedish Coastal waters Arkona Basin Swedish Coastal waters Rubber Arkona Basin Swedish Coastal waters Cloth/textile Arkona Basin Swedish Coastal waters Paper/cardboard Arkona Basin Swedish Coastal waters Processed/worked wood Arkona Basin Swedish Coastal waters Metal Arkona Basin Swedish Coastal waters Glass/ceramics Arkona Basin Swedish Coastal waters Unclassified Arkona Basin Swedish Coastal waters Sum Arkona Basin Swedish Coastal waters Bothnian Bay Swedish Coastal waters Rubber Bothnian Bay Swedish Coastal waters Cloth/textile Bothnian Bay Swedish Coastal waters Paper/cardboard Bothnian Bay Swedish Coastal waters

30 Mean Total number Lower Upper Percentile Percentile HELCOM_subasin_National number Sum Min Max of items quartile quartile 15 9 of data /1m Processed/worked wood Bothnian Bay Swedish Coastal waters Metal Bothnian Bay Swedish Coastal waters Glass/ceramics Bothnian Bay Swedish Coastal waters Unclassified Bothnian Bay Swedish Coastal waters Sum Bothnian Bay Swedish Coastal waters Eastern Gotland Basin Swedish Coastal waters Rubber Eastern Gotland Basin Swedish Coastal waters Cloth/textile Eastern Gotland Basin Swedish Coastal waters Paper/cardboard Eastern Gotland Basin Swedish Coastal waters Processed/worked wood Eastern Gotland Basin Swedish Coastal waters Metal Eastern Gotland Basin Swedish Coastal waters Glass/ceramics Eastern Gotland Basin Swedish Coastal waters Unclassified Eastern Gotland Basin Swedish Coastal waters Sum Eastern Gotland Basin Swedish Coastal waters Kattegat Swedish Coastal waters Rubber Kattegat Swedish Coastal waters Cloth/textile Kattegat Swedish Coastal waters Paper/cardboard Kattegat Swedish Coastal waters Processed/worked wood Kattegat Swedish Coastal waters Metal Kattegat Swedish Coastal waters Glass/ceramics Kattegat Swedish Coastal waters Unclassified Kattegat Swedish Coastal waters Sum Kattegat Swedish Coastal waters

31

32 Mean number of items / 1m Fig. 7 Mean of number of items of artificial polymer materials per 1 m calculated upon data for HELCOM sub-basin gathered in the periods listed in Table 1 Mean number of items / 1m Cloth/textile Fig. 8 Mean of number of items of cloth/textile per 1 m calculated upon data for HELCOM subbasin gathered in the periods listed in Table 1

33 Mean number of items / 1m Glass/ceramics Fig. 9 Mean of number of items of glass/textile per 1 m calculated upon data for HELCOM subbasin gathered in the periods listed in Table 1 Mean number of items / 1m Metal Fig. 1 Mean of number of items of metal per 1 m calculated upon data for HELCOM sub-basin gathered in the periods listed in Table 1

34 Mean number of items / 1m Paper/cardboard Fig. 11 Mean of number of items of paper/cardboard per 1 m calculated upon data for HELCOM sub-basin gathered in the periods listed in Table 1 Mean number of items / 1m Processed/worked wood Fig. 12 Mean of number of items of processed/worked wood per 1 m calculated upon data for HELCOM sub-basin gathered in the periods listed in Table 1

35 Mean number of items / 1m Rubber Fig. 13 Mean of number of items of rubber per 1 m calculated upon data for HELCOM sub-basin gathered in the periods listed in Table 1 Mean number of items / 1m Unclassified Fig. 14 Mean of number of items of unclassified per 1 m calculated upon data for HELCOM subbasin gathered in the periods listed in Table 1

36 Mean number of items / 1m Sum Fig. 15 Mean of number of sum of items per 1 m calculated upon data for HELCOM sub-basin gathered in the periods listed in Table 1