Probability that the seafloor is below the halocline in the Baltic - Original point dataset – Version 2022

Based on DHI operational Hydrodynamic 3D Model DKBS2hd model run results, a point dataset describing for each year the probability of a certain seabed location in the Baltic Sea being located below the deep halocline has been created. The spatial coverage is the Baltic Sea. The spatial resolution is 5km. The temporal coverage is 20 years (2001-2020). The dataset is a point shapefile, the attribute table of which contains the following columns - 20 columns whose name is in the form p[yyyy] (e.g; p2001), where yyyy is the year: for the year yyyy, probability of the point location being located below the deep halocline - column ‘mean’: probability average (i.e. average of the 20 yearly probabilities) - column ‘std’: probability standard deviation across the 20 years The development of the original point dataset was funded by the EMODnet lot ‘Seabed Habitats’ for use in the development of the EUSeaMap product, more specifically in modeling the spatial distribution of the biological zones ‘circalittoral’ and ‘offshore circalittoral’. According to the EUNIS habitat classification, in the Baltic Sea the circalittoral is above the halocline/pycnocline, while the offshore circalittoral is below.

Identificatie

Alternatieve titel PH_BAL_000l_AVG_HALOCLINE_PT
Versiedatum 2022-09-15T12:00:00
Type versiedatum Publicatie: Uitgavedatum van de dataset.
Dataset identificator Probability that the seafloor is below the halocline in the Baltic - Original point dataset – Version 2022

Inhoud

Krediet EMODnet broad-scale seabed habitat map for Europe (2022), funded by the European Commission
Krediet DHI, DKBS2, Hydrodynamic Model Setup and Validation, Technical note, DHI, August 2018. Available upon request to the author (see section 'author' in the current metadata)
Status compleet: Productie van de data is compleet / afgerond.

Contactgegevens dataset(serie)

Naam Contactpersoon Poul Hammer
Organisatie DHI
E-mail ph@dhigroup.com
Rol Auteur: Partij die auteur is van de data.

Contactgegevens dataset(serie)

Naam Contactpersoon Mickaël Vasquez
Organisatie Ifremer
E-mail Mickael.Vasquez@ifremer.fr
Rol Producent: Partij die de data heeft aangemaakt.

Contactgegevens dataset(serie)

Naam Contactpersoon Zyad Al-Hamdani
Organisatie GEUS
E-mail azk@geus.dk
Rol Producent: Partij die de data heeft aangemaakt.

Contactgegevens dataset(serie)

Naam Contactpersoon Verner Brandbyge Ernstsen
Organisatie GEUS
E-mail vbe@geus.dk
Rol Producent: Partij die de data heeft aangemaakt.

Trefwoorden

GEMET - INSPIRE themes, version 1.0 Oceanographic geographical features
GDI-Vlaanderen Trefwoorden Metadata GDI-Vl-conform
Overige trefwoorden Halocline , Picnoclyne
Overige trefwoorden Baltic Sea
Ruimtelijk schema dataset(serie) vector: Vector data wordt gebruikt om geografische data te representeren.

Ruimtelijke resolutie dataset(serie)

Noemer 5
Taal Engels
Karakterset UTF-8: 8-bit variabele grootte universele karakterset, gebaseerd op ISO/IEC 10646
Categorie(ën) Oceanen

Begrenzing

Omschrijving geografische begrenzing

Omschrijvende rechthoek

Minimum x-coordinaat 4.68284214382817
Maximum x-coordinaat 33.257426104929
Minimum y-coordinaat 53.0852016593362
Maximum y-coordinaat 65.8122850195508
Identificator geografische begrenzing

Referentiesysteem

Horizontaal en/of verticaal referentiesysteem

Unieke code 32633
Codespace EPSG

Kwaliteit

Niveau kwaliteitsinformatie Dataset: Informatie heeft betrekking op de dataset.

Bewerkingen

Algemene beschrijving herkomst The model was run by DHI in August 2022. Based on the model results, the final dataset was produced using the following procedure: Firstly the Brunt-Vaisala frequency squared (N2 = -g/ρ·dρ/dz, where g is the acceleration due to gravity, ρ is local water density as calculated by the hydrodynamic model and z is the vertical distance) was calculated in every model grid point horizontally and vertically for every time step. The Brunt-Vaisala frequency squared represents the strength of the stratification of the water column at a certain location. Secondly for every time step and for every horizontal grid point, the depth of the vertical maximum Brunt-Vaisala frequency squared was determined – this depth is assumed to represent the location of the deep halocline. In order to exclude any transient haloclines in the upper water column, a limit on the halocline depth of 25m was introduced such that only the water column below 25m was considered. Another limitation introduced in the analysis is that N^2 has to be above 0.0005s^-2 before it is accepted. This means that if N^2 at a certain time in a certain horizontal location is below this limit in the whole water column, then no halocline is identified. This lower limit on N^2 was introduced after some trial-and-error, in order to avoid identifying ‘false’ haloclines. Notice that this limit is influenced by both physical and model resolution considerations. Thirdly the annual probability of a certain seabed location being located under the deep halocline was calculated as the amount of time steps where a deep halocline was identified divided by the total number of time steps. The above procedure has been performed for the years delivered from 2001 to 2020 (incl.).

Conformiteit

Domeinconsistentie

Resultaat

Specificatie

Titel specificatie Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
Versiedatum 2010-12-08
Type versiedatum Publicatie: Uitgavedatum van de dataset.
Uitleg See the referenced specification
Conform verklaard Ja

Domeinconsistentie

Resultaat

Specificatie

Titel specificatie COMMISSION REGULATION (EC) No 1205/2008 of 3 December 2008 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards metadata
Versiedatum 2008-12-04
Type versiedatum Publicatie: Uitgavedatum van de dataset.
Uitleg See the referenced specification
Conform verklaard Ja

Toegangs- en gebruiksbeperkingen

Legale en veiligheidsbeperkingen

Beperkingen van de dataset(serie)

Legale beperkingen

(Juridische) toegangsbeperking anders: Restrictie niet opgenomen in lijst.

Overige beperkingen

Overige beperkingen no limitations to public access

Beperkingen van de dataset(serie)

Legale beperkingen

(Juridische) gebruiksbeperking anders: Restrictie niet opgenomen in lijst.

Overige beperkingen

Overige beperkingen no conditions to access and use

Beperkingen van de dataset(serie)

Legale beperkingen

Beschrijving Product under creative common license CC BY-NC-SA: https://creativecommons.org/licenses/by-nc-sa/4.0/
Beschrijving Citation in maps should be as follows: "Source : EMODnet Seabed Habitats (derived from DHI Hydrodynamic 3D Model DKBS2hd)"
Beschrijving Citation in bibliography should be as follows: "Vasquez, M., et al. EUSeaMap 2023. A European broad-scale seabed habitat map. Technical Report"

Distributie

Meta-metadata

Metadata identificator (fileIdentifier) 9e4edb30-aefb-4551-9c6f-7cf324b4edb3
Taal metadatarecord Engels
Karakterset metadatarecord UTF-8: 8-bit variabele grootte universele karakterset, gebaseerd op ISO/IEC 10646
Hiërarchisch niveau Dataset: Informatie heeft betrekking op de dataset.
Metadata wijzigingsdatum 2022-09-12T14:56:09.194Z
Naam metadatastandaard ISO 19115:2003/19139
Versie metadatastandaard 1.0

Metadata-auteur

Naam Contactpersoon Joint Nature Conservation Committee
Organisatie JNCC
E-mail emodnetseabedhabitats@jncc.gov.uk
Rol Contactpunt: Partij waarmee contact kan worden opgenomen voor het vergaren van kennis of verstrekking van de data.

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