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Median grain size of North Sea surface sediments
purpose:
The map shows the median grain size (or d50) of surface sediments in the North Sea predicted by interpolation of legacy grain size distribution data. It has been produced to aid in describing physical habitat characteristics and to supply consistent baseline data and boundary conditions for ecological and biophysical modelling.
abstract:
In grain size analysis, the median is the midpoint of the cumulative particles size distribution curve of a sediment sample. The median grain size is an important biophysical variable that relates to sediment stability and often can be mapped with a quantifiable correspondence to the occurrence of benthic species and assemblages. This map conveys information on the median grain size of seabed sediments in the North Sea. It has been produced with multivariate geostatistics (external drift kriging) using the percentage mud content as a trend variable. The underlying data set is a compilation of over 30,000 sediment samples from many national and European surveys conducted over a period of more than 50 years. Due to the vintage of some samples in the database, users are advised to consider the dynamic nature of the seafloor when using the data and when creating derived surrogate based habitat maps. Also, due to the diversity of sources for the pointdata, users should be aware of the differing methods by which the grain size analyses were conducted. As a consequence, map confidence is not necessarily uniform and thus areas not always comparable, even though the interpolation surface my look continuous.
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Citation proposal
Dr. Frank-Detlef Bockelmann (Helmholtz-Zentrum Geesthacht, Zentrum für Material- und Küstenforschung GmbH). Median grain size of North Sea surface sediments. https://gdk.gdi-de.org/geonetwork/srv/api/records/de.dkrz.wdcc.iso3565414 |
Simple
- Alternate title
- Median grain size of North Sea surface sediments
- Date ( Creation )
- 2017-11-16
- Identifier
- None
- Identifier
- doi:10.1594/WDCC/coastMap_Substrate_MGS / Median grain size of North Sea surface sediments
Originator
- Other citation details
- doi:10.1594/WDCC/coastMap_Substrate_MGS
Point of contact
- Keywords ( Theme )
-
- seafloor conditions
- Keywords ( Theme )
-
- geodata
- Metadata language
- eng English
))
- Begin date
- 1960-01-01
- End date
- 2014-12-31
- Distribution format
-
- zip-file (zip-file )
Distributor
- Units of distribution
- Mb
- Transfer size
- 1
- OnLine resource
- http://doi.org/doi:10.1594/WDCC/coastMap_Substrate_MGS
- Hierarchy level
- series Series
gmd:MD_Metadata
- File identifier
- de.dkrz.wdcc.iso3565414 XML
- Hierarchy level
- series Series
- Hierarchy level name
- coastMap_Substrate_MGS
- Date stamp
- 2022-04-23T04:26:56
- Metadata standard name
- ISO 19115
- Metadata standard version
- ISO 19139 / DKRZ ISO Simple Profile V1.0
Point of contact
Originator
Overviews
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