Beach Litter - Mean number of Cigarette related items per 100m & to 1 survey - without UNEP_MARLIN - Other sources

This visualization product displays smoking related items abundance per beach per year obtained during research & cleaning operations. EMODnet Chemistry included the gathering 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, - Separation of monitoring surveys from research & cleaning operations - Exclusion of beaches with no coordinates - Normalization of survey lengths and survey numbers per year - Some categories & some litter types have been removed Abundances have been calculated on each beach and year using the following computation: Cigarette related items abundance=(total number of Cigarette related items (normalized at 100m))/(Number of surveys on the year) Percentiles 50, 75 & 95 have been calculated taking into account data from all years. Cigarette related items reference codes taken into account for this product and information on data processing and calculation are detailed in the document attached p15.

该可视化产品展示了在研究及清理作业期间，每年每个海滩上与吸烟相关的物品丰富度。在 EMODnet 化学（EMODnet Chemistry）项目的第三阶段，收集海洋垃圾成为其重要内容之一。自 2018 年初以来，海滩垃圾数据已在 EMODnet 化学 海洋垃圾数据库（MLDB）中收集和处理。鉴于数据来源、采样方案和参考列表在欧盟范围内的异质性，数据的一致性处理成为最具挑战性的任务。为了实现数据的一致性，进行了初步处理，包括：排除 OSPAR 1000 协议、将监测调查与研究及清理作业分离、排除无坐标的海滩、规范化年度调查长度和年度调查次数，以及删除某些类别和某些垃圾类型。每个海滩和每年的丰富度通过以下计算得出：与香烟相关的物品丰富度=（香烟相关物品的总数，按 100 米标准化）/（该年度的调查次数）。计算了考虑所有年度数据的第 50、75 和 95 个百分位数。本产品所考虑的与香烟相关的物品参考代码以及数据处理和计算的信息详见于附文第 15 页。