Beach litter - Single use plastics (SUP) related items abundance normalized per 100m & to 1 survey - Other sources 2001/2020 v2021

This visualization product displays the single use plastics (SUP) related items abundance of marine macro-litter (> 2.5cm) per beach per year from non-MSFD monitoring surveys, research & cleaning operations. EMODnet Chemistry included the collection of marine litter in its 3rd phase. Since the beginning of 2018, data of beach litter have been gathered and processed in the EMODnet Chemistry Marine Litter Database (MLDB). The harmonization of all the data has been the most challenging task considering the heterogeneity of the data sources, sampling protocols and reference lists used on a European scale. Preliminary processing were necessary to harmonize all the data: - Exclusion of OSPAR 1000 protocol: in order to follow the approach of OSPAR that it is not including these data anymore in the monitoring; - Selection of surveys from non-MSFD monitoring, cleaning and research operations; - Exclusion of beaches without coordinates; - Selection of SUP related items only. The list of selected items is attached to this metadata. This list was created using EU Marine Beach Litter Baselines for Macro Litter on Coastlines from JRC (this document is attached to this metadata); - Exclusion of surveys without associated length; - Normalization of survey lengths to 100m & 1 survey / year: in some case, the survey length was not 100m, so in order to be able to compare the abundance of litter from different beaches a normalization is applied using this formula: Number of SUP related items of the survey (normalized by 100 m) = Number of SUP related items of the survey x (100 / survey length) Then, this normalized number of SUP related items is summed to obtain the total normalized number of SUP related items for each survey. Finally, the median abundance of SUP related items for each beach and year is calculated from these normalized abundances of SUP related items per survey. Percentiles 50, 75, 95 & 99 have been calculated taking into account SUP related items from other sources data for all years. More information is available in the attached documents. 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 Marine Litter Database for this area.

本可视化产品展示了基于非海洋战略框架指令（Marine Strategy Framework Directive, MSFD）监测调查、研究与清理行动获取的每年每处海滩海洋大型垃圾（粒径大于2.5cm）中一次性塑料（Single Use Plastics, SUP）相关物品的丰度。欧洲海洋观测与数据网络化学分部（EMODnet Chemistry）已将海洋垃圾监测纳入其第三阶段工作范畴。自2018年初起，海滩垃圾数据已完成采集并处理至EMODnet Chemistry海洋垃圾数据库（Marine Litter Database, MLDB）。考虑到欧洲范围内数据源、采样方案及参考清单存在显著异质性，对所有数据开展统一化处理是本次工作中最具挑战性的任务。为完成全量数据的统一化处理，需开展以下初步工作：- 排除OSPAR 1000协议相关数据：遵循OSPAR不再将此类数据纳入监测的规范要求；- 选取非MSFD监测、清理及研究行动产生的调查数据；- 排除未附带坐标信息的海滩数据；- 仅保留与SUP相关的物品数据。本次选定的物品清单已附于本元数据，该清单依据欧盟联合研究中心（Joint Research Centre, JRC）发布的《沿海大型垃圾欧盟海滩垃圾基线》制定（相关文档已随本元数据一并附上）；- 排除未附带调查样线长度信息的调查数据；- 将调查样线长度标准化为100米，且每年仅保留1份有效调查数据：部分调查的采样长度并非100米，为实现不同海滩垃圾丰度的横向可比，需通过以下公式完成标准化：标准化后每100米样线的SUP相关物品数量 = 本次调查实际记录的SUP相关物品数量 × (100 / 调查样线长度)随后，将标准化后的SUP相关物品数量求和，以得到每份调查的总标准化SUP相关物品数量。最终，基于每份调查的标准化丰度数据，计算得到每处海滩每年的SUP相关物品丰度中位数。此外，还针对全年度其他来源的SUP相关物品数据，计算了50、75、95及99百分位数。更多详细信息可参阅随附文档。注意：地图上未显示数据并不代表该区域不存在海洋垃圾，仅代表该区域未向海洋垃圾数据库录入相关监测信息。