HELCOM Metadata catalogue
Chlorophyll-a HOLAS 3
This core indicator evaluates the average chlorophyll-a concentration in surface water (0 – 10 m) during summer (June – September) during the assessment period 2016-2021. The measured average chlorophyll-a is a combined estimate of three types of data:
1) in-situ measurements from oceanographic monitoring data (surface water 0-10 m) and
2) earth observation data.
3) Ferrybox data.
More detailed description on methodology can be found at
HELCOM Core indicator report at https://indicators.helcom.fi/indicator/chlorophyll/
This dataset displays the result of the indicator in HELCOM Assessment Scale 4b (Division of the Baltic Sea into 19 open sea sub-basins and division of coastal areas to WFD water types or water bodies). The open sea areas have been assessed based on HELCOM Monitoring data, earth observation data and ferrybox data. Results for coastal areas are based on national WFD results reported by HELCOM EG EUTRO.
Attribute information:
"HELCOM_ID" = Code of the HELCOM scale 4b assessment unit
"Country" = Country/ Opensea
"level_2" = name of the subbasin
"level_4" = Name of the HELCOM scale 4 assessment unit
"Area (km2)" = Area of the HELCOM scale 4 assessment unit
"Indicator" = Name of indicator
“Season” = Season of the indicator (Summer = June-September)
“Period” = Assessment period (20162021 = 2016 – 2021)
Indicator value (ES) = Indicator value calculated for the assessment unit
"Standard deviation (STD)" = Standard deviation of data used for calculating ES
"Number of samples " = Number of samples by assessment unit
"Theshold value (ET)" = Commonly agreed thershold value
"Ratio between ES and ET (ER)" = Eutrophication ratio: Ratio between ES and ET (in case of indicator with positive response to eutrophication)
"ES_SCORE” = Confidence based on the data used for calculating ES
"ET_SCORE” = Confidence of target-setting procedure
"I_SCORE” = Confidence (%) = average of ES-Score and ET-Score
"Indicator Weight" = Indicator Weight in integrated eutrophication assessment
“Status” = Status of the indicator (“Good”, “Not good”, “Not assessed” or "Not applicable")
“Confidence” = Confidence of result based on I-SCORE (“High”, “Moderate” or “Low”)
"AULEVEL" = Assessment unit level used for the indicator
Simple
- Date (Creation)
- 2023-03-18
- Unique resource identifier
- https://metadata.helcom.fi/geonetwork/srv/eng/catalog.search#/metadata/5326090b-6414-4070-a003-1e6f098b2908
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GEMET - INSPIRE themes, version 1.0
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Oceanographic geographical features
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GEMET
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chlorophyll
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- Keywords
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MADS
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HOLAS3
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Core indicator
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- Use constraints
- Other restrictions
- Other constraints
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Use constraints: Data can be used freely given that the source is cited (following creative commons license CC-BY). The source should be cited as: “HELCOM HOLAS 3 Dataset (2023)"
- 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
- 2016-01-01 Unknown
- End date
- 2021-12-31 Now
- 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 Chlorophyll-a HOLAS 3 ( WWW:LINK-1.0-http--link )
- OnLine resource
- View Chlorophyll-a HOLAS 3 ( WWW:LINK-1.0-http--link )
- Hierarchy level
- Dataset
Conformance result
- Date (Publication)
- 2010-12-08
- Statement
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Data source: The average chlorophyll-a was combined estimate of two types of data:
1) In-situ monitoring data provided by the HELCOM Contracting Parties, and kept in the HELCOM COMBINE
database, hosted by ICES (www.ices.dk), added with data from the Gulf of Finland year database, hosted by
the Finnish Environment Institute.
2) FerryBox flow-through data is reported to ICES by Contracting Parties, to be included into the
eutrophication assessment database. It is reported according to the QA/QC guidance for FerryBox Flowthrough information, providing adequate metadata and quality information, including the following:
• (arithmetic and) geometric mean
• mode (most frequently occurring value in dataset)
• standard deviation
• percentiles (5,25, 50, 75, 95)
• N of observations that were used to derive statistics
Additional information:
http://www.helcom.fi/baltic-sea-trends/indicators/chlorophyll-a
- File identifier
- 5326090b-6414-4070-a003-1e6f098b2908 XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Date stamp
- 2023-09-22T16:12:45
Overviews
Spatial extent
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