HELCOM Metadata catalogue
TBT and imposex 2018 biota data
This dataset represents the underlying biota data on core indicator TBT and imposex. The core indicator evaluates the status of the marine environment based on concentrations of the tributyltin (TBT) and its breakdown products dibutyltin (DBT) and monobutyltin (MBT) in the Baltic Sea; in water, biota (mussels, marine gastropods) and sediments. Imposex effects of TBT on marine gastropods are used as another source of data on TBT. Quantitative thresholds are used to evaluate if core indicators status is Achieve, Fail or Not assessed. Good status is achieved when the concentrations of TBT are below the threshold value.
This dataset displays the result of the indicator in HELCOM Assessment Scale 4 (Division of the Baltic Sea into 17 sub-basins and further division into coastal and off-shore areas and division of the coastal areas by WFD water types or water bodies).
Attribute information:
"region" = name of region
"country" = country
"station" = Unique text that identifies the station
"stationNam" = name for the station
"determinan" = determinant parameter (VDS = Vas deference Sequence)
"detGroup" = the grouping of determinands used to display the results
"species" = species of measurement
"_shape" = shape used to map assessment results
"colour" = colour used to map assessment results
"l3area" = HELCOM assessment unit on scale 3
"l4area" = HELCOM assessment unit on scale 4
"nyall" = total number of years of data
"nyfit" = number of years of data used in the assessment
"nypos" = number of years with at least one measurement above the limit of detection
"lastyear" = most recent year of data
"prtrend" = the significance of the change over the most recent 20 years; for the assessment conducted in November 2017 and published in June 2018, this is the period 1996-2016
"rtrend" = annual ‘linear’ change over the most recent 20 years
"meanLY" = fitted value in last monitoring year
"clLY" = upper one-sided 95% confidence limit on fitted value in last monitoring year
"HQS" = Threshold value
"HQSdiff" = difference between clLY and HQS
"HQSbelow" = whether the mean value in the last monitoring year is significantly below HQS
Simple
- Date (Publication)
- 2018-06-28
- Unique resource identifier
- https://metadata.helcom.fi/geonetwork/srv/eng/catalog.search#/metadata/4df4cdd5-588e-4834-b163-486e94ad4ce0
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GEMET - INSPIRE themes, version 1.0
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Oceanographic geographical features
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- Keywords
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MADS
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HOLAS2 2018 Core indicator
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Core indicator
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- Use constraints
- Other restrictions
- Other constraints
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Use constraints: The data and resulting data products (tables, figures and maps) available on the indicator web pages can be used freely given that the source is cited. The indicator should be cited as following: HELCOM (2018) TBT and imposex. HELCOM core indicator report. Online. [Date Viewed], [Web link].
- Access constraints
- Other restrictions
- Other constraints
- Access constraints: No limitations on public access.
- Spatial representation type
- Vector
- Metadata language
- English
- Topic category
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- Environment
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- Begin date
- 2011-01-01
- End date
- 2016-12-31
- Unique resource identifier
- EPSG:3035
- Distribution format
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ESRI Shapefile
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1.0
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ESRI Shapefile
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1.0
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- OnLine resource
- Download dataset ( WWW:LINK-1.0-http--link )
- OnLine resource
- Open in Map Viewer ( WWW:LINK-1.0-http--link )
- Hierarchy level
- Dataset
Conformance result
- Date (Publication)
- 2010-12-08
- Statement
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The indicator is based on data held in the HELCOM COMBINE database hosted at the International Council for the Exploration of the Seas (ICES). To evaluate contamination status of Baltic Sea, the ratio of concentration of TBT in the biotic and abiotic elements of marine environment to the specified concentration (threshold) levels are used. Data are extracted from the HELCOM COMBINE database as specified in the extraction table to ensure that the values are from the appropriate measurement matrices (Assessment protocol table 1). The confidence of the indicator evaluation is high in the Kattegat and Belt Sea/The sound area since the data on TBT concentrations and imposex bivalves, sediments and marine gastropods is spatially adequate and time series are available for several stations. In the rest of the Baltic Sea, confidence is low due to very limited data availability.
Additional information:
http://www.helcom.fi/baltic-sea-trends/indicators/tbt-and-imposex
Link to metadata of the indicator:
- File identifier
- 4df4cdd5-588e-4834-b163-486e94ad4ce0 XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Date stamp
- 2021-09-24T11:16:49
Overviews
Spatial extent
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