Physical environment - In situ data - Chlorophyll a concentration collected during the International Bottom Trawl Survey in 2007

Three environmental parameters were measured in situ during the IBTS in 2007. Temperature and salinity were measured using thermosalinometer 3 to 5 m under sea surface. Sub-surface (3-5 m) chlorophyll a concentration was measured using a fluorometer (measure the fluorescence emitted by the pigment). The IBTS survey, which takes place each year in January, gives a good illustration of winter conditions.

Simple

Alternate title
IBTS_environment_geostatA
Date ( Publication )
2009-12-31T00:00:00
Identifier
CHARM_IBTS_CHLOROA_R
Presentation form
Digital map
Other citation details
Source CHARM Consortium
Credit
IFREMER
Credit
CHARM consortium
Status
Completed
Point of contact
Ifremer - Yves Verin ( )
Laboratoire de Ressources Halieutiques, Ifremer, 150 quai Gambetta BP699 , Boulogne sur mer , 62321 ,
Custodian
CHARM Consortium - CHARM Consortium
Maintenance and update frequency
As needed
Thèmes Sextant ( Theme )
  • /Physical Environment/Physical Habitats
Keywords ( Discipline )
  • Species data set
  • CHARM
external.theme.gemet ( Theme )
  • ressource halieutique
GEMET - INSPIRE themes, version 1.0 ( Theme )
  • Oceanographic geographical features
Use limitation
research-only
Access constraints
License
Other constraints
Has to be cited this way in maps : "Source CHARM Consortium"
Other constraints
Has to be cited this way in bibliography : "Carpentier A, Martin CS, Vaz S (Eds.), 2009. Channel Habitat Atlas for marine Resource Management, final report / Atlas des habitats des ressources marines de la Manche orientale, rapport final (CHARM phase II). INTERREG 3a Programme, IFREMER, Boulogne-sur-mer, France. 626 pp. & CD-rom"
Spatial representation type
Grid
Denominator
1000
Metadata language
en
Metadata language
fr
Character set
UTF8
Topic category
  • Biota
  • Oceans
  • Environment
Environment description
Microsoft Windows XP ; ESRI ArcGIS 9.x
Geographic identifier
Dover strait and southern half of the North Sea
N
S
E
W
thumbnail


Begin date
2007-01-01T16:09:00
End date
2007-01-31T09:00:00
Reference system identifier
4326
Reference system identifier
EPSG / WGS 84 (EPSG:4326) / 7.4
Number of dimensions
2
Dimension name
Column
Dimension size
334
Resolution
0.009  degree,
Dimension name
Row
Dimension size
314
Resolution
0.009  degree,
Cell geometry
Area
Transformation parameter availability
No

Distributor

Distributor
Ifremer - Centre de Brest
OnLine resource
CHARM web site ( WWW:LINK )

CHARM web site

Protocol
COPYFILE
Name
Chlorophyll a concentration
Description
Chlorophyll a concentration
OnLine resource
CHARM_IBTS_CHLOROA_R ( OGC:WMS )

Chlorophyll a concentration

Hierarchy level
Dataset
Statement
The survey concerns the Dover Strait to the southern half of the North Sea. Its aim is to estimate fish abundance and distribution and to compute recruitment indices (abundance of juveniles) for the fish species exploited in the North Sea. In parallel to its regular actions, the 2007 French IBTS used a continuous fish egg pumping device called CUFES allowing the collection of information on the spatial distribution of winter spawning areas and on the spawning habitat of several important species.
Description
Statistical analysis : the statistical distribution of environmental data were tested for normality (histograms, skewness, kurtosis). The data were transformed whem skewness value exceeded |1| and/or kurtosis exceeded 1 and if a normalising function that could improve the data distribution was found. Environmental variables were measured on scales based on analytical conventions that are unrelated to the natural processes generated them. Therefore, any transformed scale is as appropriate as those on which these data were originally recorded. Geostatistical interpolation : the spatial variation of environmental data were analysed using GENSTAT (GENSTAT 7 Committee, 2004), which is a GENeral STATistics package including the main geostatistical tools. It computes experimental variograms, fits these with various authorised mathematical models and uses them to calculate kriged estimates on a fine regular grid (of latitudes and longitudes). The grid of points was imported into ArcMap and interpolated with the Spatial Analyst extension in order to create a continuous raster of 1 km² resolution. The resulting maps illustrate the spatial distributions and the variations over time for environmental data studied in CHARM's area. For legends of maps, approximates od the 5th and the 95th quantiles were used for the minimales and maximales values respectively.
Description
IBTS survey, scientific survey of IFREMER
File identifier
b818ec63-d11f-4b2f-833a-4037830e31a1 XML
Metadata language
en
Character set
UTF8
Hierarchy level
Dataset
Date stamp
2020-06-04T00:40:07
Metadata standard name
ISO 19115:2003/19139 - SEXTANT
Metadata standard version
1.0
Point of contact
Ifremer - Fanny Lecuy
 
 

Overviews

overview

Spatial extent

N
S
E
W
thumbnail


Keywords

GEMET - INSPIRE themes, version 1.0
Oceanographic geographical features
Thèmes Sextant
/Physical Environment/Physical Habitats
external.theme.gemet
ressource halieutique

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