Metadata catalogue
Seafloor litter - Plastic bags density normalized per km² 2012/2021 v2021
This visualization product displays plastic bags density per trawl.
EMODnet Chemistry included the collection of marine litter in its 3rd phase. Since the beginning of 2018, data of seafloor litter collected by international fish-trawl surveys 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 (OSPAR and MEDITS protocols) and reference lists used on a European scale. Moreover, within the same protocol, different gear types are deployed during fishing bottom trawl surveys.
In cases where the wingspread and/or number of items were unknown, data could not be used because these fields are needed to calculate the density. Data collected before 2011 are affected by this filter.
When the distance reported in the data was null, it was calculated from:
- the ground speed and the haul duration using this formula: Distance (km) = Haul duration (h) * Ground speed (km/h);
- the trawl coordinates if the ground speed and the haul duration were not filled in.
The swept area is calculated from the wingspread (which depends on the fishing gear type) and the distance trawled:
Swept area (km²) = Distance (km) * Wingspread (km)
Densities have been calculated on each trawl and year using the following computation:
Density of plastic bags (number of items per km²) = ∑Number of plastic bags related items / Swept area (km²)
Percentiles 50, 75, 95 & 99 have been calculated taking into account data for all years.
Plastic bags reference codes taken into account for this product and information on data processing and calculation are detailed in the document attached p22.
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.
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Citation proposal
Ifremer, VIGIES (Information Valuation Service for Integrated Management and Monitoring) - IFREMER, SISMER, Scientific Information Systems for the SEA. Seafloor litter - Plastic bags density normalized per km² 2012/2021 v2021. https://services.mspdata.eu:/geonetwork/srv/api/records/af33bb27-a321-4376-a42e-6f856a936cd9 |
Simple
- Alternate title
- sl_plasticbags
- Date ( Creation )
- 2021-06-28
- Edition
- 1.0
- Identifier
- DOI:10.13120/af33bb27-a321-4376-a42e-6f856a936cd9
- Credit
- EMODnet Chemistry
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- Thèmes Sextant ( Theme )
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- /Human Activities/Pollution
- GEMET - INSPIRE themes, version 1.0 ( Theme )
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- Oceanographic geographical features
- Parameter Discovery Vocabulary (P02) ( parameter )
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- Litter abundance and type , Sea-floor litter abundance
- SeaVoX salt and fresh water body gazetteer ( reference-geographical-area )
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- Black Sea , Baltic Sea , Mediterranean Sea , Arctic Ocean , Northeast Atlantic Ocean (40W) , North Sea
- Keywords ( Theme )
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- EMODnet Chemistry
- Matrix Categories ( parameter )
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- sediment
- EMODnet Chemistry chemical groups ( parameter )
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- Marine litter
- Use limitation
- CC BY 4.0: https://creativecommons.org/licenses/by/4.0/
- Access constraints
- Other restrictions
- Use constraints
- Creative Commons Attribution 4.0 International
- Other constraints
- Usage is subject to mandatory citation: "This resource was generated in the framework of EMODnet Chemistry, under the support of DG MARE Call for Tender EASME/EMFF/2018/1.3.1.8 - lot4."
- Spatial representation type
- Vector
- Metadata language
- eng
- Topic category
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- Oceans
- Description
- bounding box
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- Reference system identifier
- EPSG / WGS 84 (EPSG 4326)
- Geometric object type
- Point
- Distribution format
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- ( )
- OnLine resource
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sl_plasticbags
Seabed litter - Plastic bags density (Nb. Items/km2)
- OnLine resource
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Visualization products for Beach and Seafloor Litter data
Methodologies applied to create the maps
- OnLine resource
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Guidelines and forms for gathering marine litter data
Guidelines and forms for gathering marine litter data
- OnLine resource
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Data Access and Citation
Data Access and Citation
- OnLine resource
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Direct Download
Direct Download
- Hierarchy level
- Series
Conformance result
- Date ( Publication )
- 2010-12-08
- Explanation
- See the referenced specification
- Statement
- The data used as input for this product have been extracted from the EMODnet Chemistry Download Service: https://emodnet-chemistry.maris.nl/search
Metadata
- File identifier
- af33bb27-a321-4376-a42e-6f856a936cd9 XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Series
- Hierarchy level name
- Product record
- Date stamp
- 2021-11-26T13:56:11
- Metadata standard name
- ISO 19115:2003/19139 - EMODNET - SDN
- Metadata standard version
- 1.0
