Mon GéoSource
Physical environment - Modelled satellite data - Mean monthly cholorphyll a concentration (1998-2006)
Simple
- Autres appellations ou acronymes
- Satellite_environment_geostatP
- Date ( Publication )
- 2009-12-31T00:00:00
- Identificateur
- CHARM_SATELL_CHLOROA_12_R
- Forme de la présentation
- Carte numérique
- Autres informations de référence
- Source CHARM Consortium
- Reconnaissance
- CERSAT
- Reconnaissance
- CHARM consortium
- Etat
- Finalisé
- Fréquence de mise à jour
- Lorsque nécessaire
- Thèmes Sextant ( Thème )
-
- /Physical Environment/Physical Habitats
- Mots clés ( Discipline )
-
- environment data set
- CHARM
- external.theme.gemet ( Thème )
-
- chlorophylle
- GEMET - INSPIRE themes, version 1.0 ( Thème )
-
- Oceanographic geographical features
- Limitation d'utilisation
- research-only
- Contraintes d'accès
- Licence
- Autres contraintes
- Has to be cited this way in maps : "Source CHARM Consortium"
- Type de représentation spatiale
- Raster
- Dénominateur de l'échelle
- 1000
- Langue
- fr
- Langue
- en
- Jeu de caractères
- Utf8
- Catégorie ISO
-
- Océans
- Description de l'environnement de travail
- Microsoft Windows XP ; ESRI ArcGIS 9.x
- Identifiant géographique
- Eastern English Channel
))
- Date de début
- 1998-01-01T00:00:00
- Date de fin
- 2006-12-31
- Nom du système de référence
- WGS 84 (EPSG:4326)
- Dimensions
- 2
- Noms des axes
- Axe - X
- Nombre de pixel
- 141
- Résolution
- 0.015 degree
- Noms des axes
- Axe - Y
- Nombre de pixel
- 84
- Résolution
- 0.015 degree
- Type de raster
- Surface
- Disponibilité des paramètres de transformation
- Non
Distributeur
- Ressource en ligne
-
CHARM web site
(
WWW:LINK
)
CHARM web site
- Protocole
- COPYFILE
- Nom
- January
- Description
- January
- Protocole
- COPYFILE
- Nom
- February
- Description
- February
- Protocole
- COPYFILE
- Nom
- March
- Description
- March
- Protocole
- COPYFILE
- Nom
- April
- Description
- April
- Protocole
- COPYFILE
- Nom
- May
- Description
- May
- Protocole
- COPYFILE
- Nom
- June
- Description
- June
- Protocole
- COPYFILE
- Nom
- July
- Description
- July
- Protocole
- COPYFILE
- Nom
- August
- Description
- August
- Protocole
- COPYFILE
- Nom
- September
- Description
- September
- Protocole
- COPYFILE
- Nom
- October
- Description
- October
- Protocole
- COPYFILE
- Nom
- November
- Description
- November
- Protocole
- COPYFILE
- Nom
- December
- Description
- December
- Ressource en ligne
-
CHARM_SATELL_CHLOROA_01_R
(
OGC:WMS
)
January
- Ressource en ligne
-
CHARM_SATELL_CHLOROA_02_R
(
OGC:WMS
)
February
- Ressource en ligne
-
CHARM_SATELL_CHLOROA_03_R
(
OGC:WMS
)
March
- Ressource en ligne
-
CHARM_SATELL_CHLOROA_04_R
(
OGC:WMS
)
April
- Ressource en ligne
-
CHARM_SATELL_CHLOROA_05_R
(
OGC:WMS
)
May
- Ressource en ligne
-
CHARM_SATELL_CHLOROA_06_R
(
OGC:WMS
)
June
- Ressource en ligne
-
CHARM_SATELL_CHLOROA_07_R
(
OGC:WMS
)
July
- Ressource en ligne
-
CHARM_SATELL_CHLOROA_08_R
(
OGC:WMS
)
August
- Ressource en ligne
-
CHARM_SATELL_CHLOROA_09_R
(
OGC:WMS
)
September
- Ressource en ligne
-
CHARM_SATELL_CHLOROA_10_R
(
OGC:WMS
)
October
- Ressource en ligne
-
CHARM_SATELL_CHLOROA_11_R
(
OGC:WMS
)
November
- Ressource en ligne
-
CHARM_SATELL_CHLOROA_12_R
(
OGC:WMS
)
December
- Niveau
- Jeu de données
- Généralités sur la provenance
- Images (provided as rasters, 1.2 km cell size, referenced in WGS 1984) were obtained from IFREMER’s CERSAT (located in Plouzané, France) from databases generated for European projects (e.g. MARCOAST, ECOOP). Original data come from the AVHRR/Pathfinder centre (AVHRR sensor) and from NASA (SeaWiFS and MODIS). The best images, i.e. those where the percentage of cloud-free pixels was above a threshold of 25%, were used to calculate monthly averages.
- Description
- The mean was calculated on a Mercator grid (733 columns by 657 lines) with a pixel size of 1.2 km. For each pixel of the grid, the mean value is simply the arithmetic mean of all the satellite-derived SST, chlorophyll a concentration, mineral SPM, turbidity indicator or KPAR recorded during the month considered /SST for the period 1986-2006 ; chlorophyll a concentration, mineral SPM and KPAR for the period 1998-2006/ The first step consists in assessing the physical value of interest by applying geometric and atmospheric corrections onto the measurements taken by the sensor on-board the satellite. Climatologies can then be produced using the data. (1) SST is calculated using the infra-red channels of the AVHRR sensor on-board NOAA satellite platforms. Since 1986, thanks to these data, twice-daily temporal series for SST have been built. The SST calculation algorithm is described in Walton et al., 1998. The coefficients are calculated by regression using in situ data. (2) Ocean colour data derived from SeaWiFS and MODIS sensor allow for the assessment of chlorophyll a concentration. These assessments are based on sea water radiance measurements (Gohin et al., 2002, 2005). To retrieve chlorophyll a concentration from the radiance, a look-up table on in situ measurements and on the blue/green radiance ratio is used (procedure described in Gohin et al., 2002). (3) Once chlorophyll a concentration has been determined mineral SPM is derived from the radiance measured in the green, at 555 nm, and the red, at 670 nm.Mineral SPM is estimated by reversing a semi-analytic model of the radiation transfer taking into account the theoretical absorption and diffusion coefficients of the water and its components (algorithm based on the method of Gohin et al., 2005. This method provides realistic estimations on the continental shelf). (4) KPAR is calculated using a linear relationship, which uses mineral SPM and chlorophyll a concentration (see Gohin et al., 2005 for details).
- Description
- AVHRR/NOAA for SST; SeaWiFS and MODIS for chlorophyll a, mineral SPM, turbidity indicator and attenuation coefficient.
- Identifiant de la fiche
- 5b0cbe58-ddcd-4bf5-926a-a1db8499030f XML
- Langue
- en
- Jeu de caractères
- Utf8
- Type de ressource
- Jeu de données
- Date des métadonnées
- 2020-06-04T00:55:18
- Nom du standard de métadonnées
- ISO 19115:2003/19139 - SEXTANT
- Version du standard de métadonnées
- 1.0
Aperçus
Étendue spatiale
Fourni par
