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                  <gco:CharacterString>Freeboard, épaisseur de glace de mer et épaisseur de neige sur la glace de mer (Arctique et Antarctique)</gco:CharacterString>
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                        <gmd:LocalisedCharacterString locale="#EN">Sea Ice Freeboard, Thickness and Snow Depth (Arctic and Antarctic)</gmd:LocalisedCharacterString>
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            <gco:CharacterString>Attention : le produit diffusé sur cette fiche de métadonnées correspond à une version ancienne; il est préférable d'utiliser la version de la série sur 30 ans "[Arctic and Antarctic sea ice thickness climate data record (ERS-1, ERS-2, Envisat, CryoSat-2)](https://www.odatis-ocean.fr/donnees-et-services/acces-aux-donnees/catalogue-complet#/metadata/c52f78d1-a658-4c56-a66c-459de0d88fb6)" 
Ces produits fournissent les 4 paramètres suivants et leurs incertitudes :
- radar-freeboard,
- ice-freeboard
- épaisseur de la neige et
- épaisseur de la glace de mer,
L'objectif principal est de fournir l'épaisseur de la glace de mer (SIT pour Sea Ice Thickness), une variable climatique essentielle (ECV). La SIT dépend elle-même du freeboard de la glace de mer (FB), de l'épaisseur de la neige (SD pour Snow Depth), et de leurs densités par rapport à la densité de l'eau. Le FB et le SD peuvent être mesurés par altimétrie.
Le FB peut être mesuré par un seul altimètre [Laxon et al., 2013] alors que la mesure du SD est basée sur l'altimétrie bi-fréquence.
La solution pour estimer le SD repose sur l'altimètre CryoSat-2 Ku et l'altimètre Saral Ka [Guerreiro et al., 2016]. L'épaisseur de neige est donc limitée par l'orbite plus basse du satellite (en dessous de 81.5°N/S pour Saral) et la période de couverture commune (à partir de 2013 pour Saral). 

Pour chaque produit, les données sont fournies sur une base mensuelle et sur une grille EASE2 avec une résolution de 12,5 km pour tous les mois d'hiver (novembre-avril pour l'Arctique et mai-octobre pour l'Antarctique). Pour assurer une meilleure cohérence, un filtre de lissage est appliqué pour chaque cellule de la grille où le masque indique la présence de glace de mer. Deux versions de ces produits sont livrées, avec respectivement un rayon de filtrage de 25 km et de 50 km.</gco:CharacterString>
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                  <gmd:LocalisedCharacterString locale="#FR">Attention : le produit diffusé sur cette fiche de métadonnées correspond à une version ancienne; il est préférable d'utiliser la version de la série sur 30 ans "[Arctic and Antarctic sea ice thickness climate data record (ERS-1, ERS-2, Envisat, CryoSat-2)](https://www.odatis-ocean.fr/donnees-et-services/acces-aux-donnees/catalogue-complet#/metadata/c52f78d1-a658-4c56-a66c-459de0d88fb6)" 
Ces produits fournissent les 4 paramètres suivants et leurs incertitudes :
- radar-freeboard,
- ice-freeboard
- épaisseur de la neige et
- épaisseur de la glace de mer,
L'objectif principal est de fournir l'épaisseur de la glace de mer (SIT pour Sea Ice Thickness), une variable climatique essentielle (ECV). La SIT dépend elle-même du freeboard de la glace de mer (FB), de l'épaisseur de la neige (SD pour Snow Depth), et de leurs densités par rapport à la densité de l'eau. Le FB et le SD peuvent être mesurés par altimétrie.
Le FB peut être mesuré par un seul altimètre [Laxon et al., 2013] alors que la mesure du SD est basée sur l'altimétrie bi-fréquence.
La solution pour estimer le SD repose sur l'altimètre CryoSat-2 Ku et l'altimètre Saral Ka [Guerreiro et al., 2016]. L'épaisseur de neige est donc limitée par l'orbite plus basse du satellite (en dessous de 81.5°N/S pour Saral) et la période de couverture commune (à partir de 2013 pour Saral). 

Pour chaque produit, les données sont fournies sur une base mensuelle et sur une grille EASE2 avec une résolution de 12,5 km pour tous les mois d'hiver (novembre-avril pour l'Arctique et mai-octobre pour l'Antarctique). Pour assurer une meilleure cohérence, un filtre de lissage est appliqué pour chaque cellule de la grille où le masque indique la présence de glace de mer. Deux versions de ces produits sont livrées, avec respectivement un rayon de filtrage de 25 km et de 50 km.</gmd:LocalisedCharacterString>
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                  <gmd:LocalisedCharacterString locale="#EN">The main objective is to provide the Sea Ice Thickness (SIT) essential climate variable (ECV). The SIT depends itself on the sea ice freeboard (FB), the snow depth (SD), and their densities relatively to the water density. The FB and the SD can be measured by altimetry.
The FB can be measured by one altimeter [Laxon et al., 2013] whereas the SD measurement is based on bi-frequencies altimetry.
The solution to estimate the SD relies on CryoSat-2 Ku altimeter and Saral Ka altimeter [Guerreiro et al., 2016]. The snow depth is thus limited by the lower satellite orbit (bellow 81.5°N/S for Saral) and the common coverage period (from 2013 for Saral). 
These products provide the 4 following parameters and their uncertainties:
- radar-freeboard,
- ice-freeboard,
- snow-depth and
- sea ice thickness,
For each products, the data are provided on a monthly basis and onto an EASE2 grid with a 12,5 km pixel size resolution for all winter months (November-April for the Arctic and May-October for Antarctica). To ensure a better consistency, a smoothing filter is applied for each grid cell where the mask indicates the presence of sea ice. Two versions of these products are delivered, with respectively a 25km and a 50km filtering radius.</gmd:LocalisedCharacterString>
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