de.dkrz.wdcc.iso3565414 series coastMap_Substrate_MGS Dr. Frank-Detlef Bockelmann Helmholtz-Zentrum Geesthacht, Zentrum für Material- und Küstenforschung GmbH author Dipl.-Geogr. Ulrike Kleeberg Helmholtz-Zentrum Geesthacht, Zentrum für Material- und Küstenforschung GmbH pointOfContact Dr. Frank-Detlef Bockelmann Helmholtz-Zentrum Geesthacht, Zentrum für Material- und Küstenforschung GmbH originator Prof. Dr. Kay-Christian Emeis Center for Earth System Research and Sustainability, University of Hamburg http://www.cen.uni-hamburg.de/ originator Dr. Frank-Detlef Bockelmann Helmholtz-Zentrum Geesthacht, Zentrum für Material- und Küstenforschung GmbH originator 2022-04-23T04:26:56 ISO 19115 ISO 19139 / DKRZ ISO Simple Profile V1.0 http://doi.org/doi:10.1594/WDCC/coastMap_Substrate_MGS Median grain size of North Sea surface sediments Median grain size of North Sea surface sediments 2017-11-16 creation None Median grain size of North Sea surface sediments doi:10.1594/WDCC/coastMap_Substrate_MGS Dr. Frank-Detlef Bockelmann Helmholtz-Zentrum Geesthacht, Zentrum für Material- und Küstenforschung GmbH originator Prof. Dr. Kay-Christian Emeis Center for Earth System Research and Sustainability, University of Hamburg http://www.cen.uni-hamburg.de/ originator Dr. Frank-Detlef Bockelmann Helmholtz-Zentrum Geesthacht, Zentrum für Material- und Küstenforschung GmbH originator doi:10.1594/WDCC/coastMap_Substrate_MGS 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. Dr. Frank-Detlef Bockelmann Helmholtz-Zentrum Geesthacht, Zentrum für Material- und Küstenforschung GmbH author Dipl.-Geogr. Ulrike Kleeberg Helmholtz-Zentrum Geesthacht, Zentrum für Material- und Küstenforschung GmbH pointOfContact seafloor conditions theme geodata theme eng -5.0 12.0 50.0 62.0 1960-01-01 2014-12-31 1 Median modelResult PHI scale zip-file zip-file distributor Mb 1 http://doi.org/doi:10.1594/WDCC/coastMap_Substrate_MGS series