Sea Ice Freeboard, Thickness and Snow Depth (Arctic and Antarctic)
These data contain monthly mean gridded seaice products from altimetry including the following parameters over Arctic and Antarctic areas:
- radar freeboard (direct Ku measurement)
- ice freeboard (radar freeboard corrected from Ku speed propagation in Snow Depth)
- snow depth (SD)
- sea ice thickness (Sea Ice Thickness(SIT), using SD)
The survey of these high latitudes requires satellite altimeters with high latitude orbits : Saral/AltiKa, Cryosat-2 and Envisat.
Simple
- Title
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Sea Ice Freeboard, Thickness and Snow Depth (Arctic and Antarctic)
- Date (Publication)
- 2017-11-17
- Abstract
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These data contain monthly mean gridded seaice products from altimetry including the following parameters over Arctic and Antarctic areas:
- radar freeboard (direct Ku measurement)
- ice freeboard (radar freeboard corrected from Ku speed propagation in Snow Depth)
- snow depth (SD)
- sea ice thickness (Sea Ice Thickness(SIT), using SD)
The survey of these high latitudes requires satellite altimeters with high latitude orbits : Saral/AltiKa, Cryosat-2 and Envisat.
- Credit
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CTOH, LEGOS
- Point of contact
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Organisation name Individual name Electronic mail address Role AVISO+ CTOH
Dissemination Unit Sara Fleury
Author Florent Garnier
Author
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Thèmes Sextant
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/Imagerie/Imagerie satellitale
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GEMET - INSPIRE themes, version 1.0
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Caractéristiques géographiques océanographiques
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Centre de données ODATIS
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CDS-SAT-AVISO
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Type de jeux de donnée ODATIS
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/Télédétection
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Thèmatiques ODATIS
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Télédétection
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- Theme
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freeboard, snow depth, density, sea ice thickness
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Services Nationaux d'Observation
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SNO-CTOH
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ODATIS aggregation parameters and Essential Variable names
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Glace de mer
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- Use limitation
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Aucune condition ne s’applique
- Access constraints
- Other restrictions
- Use constraints
- Copyright
- Other legal constraints
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“The data used in this study (doi 10.6096/CTOH_SEAICE_2019_12) were developed, validated by the CTOH/LEGOS, France and distributed by Aviso +”.
- Spatial representation type
- Grid
- Distance
- 12 km
- Language
- Français
- Character set
- UTF8
- Topic category
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- Oceans
- Begin date
- 2002-01
- End date
- 2019-12 Before
- Geometric object type
- Point
- Distribution format
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Name Version
- OnLine resource
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Protocol Linkage Name WWW:LINK
ftp://ftp-access.aviso.altimetry.fr/altimetry-sea-ice/ctoh Accès authentifié aux données
WWW:LINK
https://www.aviso.altimetry.fr/en/data/products/altimetry-ice-products/altimetry-sea-ice-products-from-ctoh.html Plus d'information sur AVISO+
WWW:LINK
https://www.aviso.altimetry.fr/fileadmin/documents/data/tools/hdbk_AltimetrySeaIce_CTOH.pdf Manuel utilisateur
WWW:DOWNLOAD-1.0-link--download
https://dataterra:odatis@tds-odatis.aviso.altimetry.fr/thredds/catalog/dataset-auxilary-seaice-ctoh/catalog.html TDS fileserver Sea Ice Freeboard, Thickness and Snow Depth
WWW:LINK-1.0-http--metadata-URL
http://ctoh.legos.obs-mip.fr/data/sea-ice-products/sea-ice-thickness
- Hierarchy level
- Dataset
- Statement
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Sea ice and its snow coverage has important effects on the global climate.
Sea ice thickness (SIT) measurement relies on the “Freeboard” method. It consists in calculating the height difference between the floes (range above the ice) and the leads (range above the water in ice fractures).
Alti Snow Depth (SD) : The difference of the scattering properties of the AltiKa Ka-band (on Saral/AltiKa) and the Siral Ku-band (on Cryosat-2) altimeters provides a good proxy of the snow depth using an adapted processing chain. According to the selected product, the Snow Depth could have 3 origins:
- Modified Warren99 climatology (in Arctic only)
- AMSR (for now in Antarctic only)
- Altimetry Snow Depth (ASD ou KaKu) for both hemisphere but only for 2013-2019 as it uses Saral Ka altimeter.
For each data, an estimation of uncertainties is also provided. More detail on computation will be described soon in an handbook.
All months are concatened in one netcdf file.
File names are built as follow: SIT_{HEMISPHERE}_{start_year}_{end_year}_{SATELLITE}_Snow{snow_origin}.ease2_{pixel_size}_smth{filtering_radius}.nc
with:
- {HEMISPHERE} in [NH, SH]
- {SATELLITE} in [ENV, CS2] for Envisat or CryoSat-2
- {snow_orgin} in [W99m, AMSR, KaKu]
This Snow Depth is the one used to compute the Sea Ice Thickness
- {filtering_radius} in [25000, 50000] which are the radius in meters
References:
- For Envisat and CryoSat-2 FB and SIT :
Guerreiro, K., Fleury, S., Zakharova, E., Kouraev, A., Rémy, F., Maisongrande, P., 2017. Comparison of CryoSat-2 and ENVISAT radar freeboard over Arctic sea ice: toward an improved Envisat freeboard retrieval. The Cryosphere 11, 2059–2073. https://doi.org/10.5194/tc-11-2059-2017
- For the Snow Depth :
- Garnier, F., Fleury, S., Garric, G., Bouffard, J., Tsamados, M., Laforge, A., Bocquet, M., Fredensborg Hansen, R. M., and Rémy, F.: Advances in altimetric snow depth estimates using bi-frequency SARAL/CryoSat-2 Ka/Ku measurements, The Cryosphere Discuss. [preprint], https://doi.org/10.5194/tc-2021-79 , in review, 2021.
- Guerreiro, K., Fleury, S., Zakharova, E., Rémy, F., Kouraev, A., 2016. Potential for estimation of snow depth on Arctic sea ice from CryoSat-2 and SARAL/AltiKa missions. Remote Sensing of Environment 186, 339–349. https://doi.org/10.1016/j.rse.2016.07.013
Metadata
- File identifier
- 5115f69c-414a-49b7-b8cc-6b5d57bc0458
- Metadata language
- Français
- Character set
- UTF8
- Hierarchy level
- Dataset
- Date stamp
- 2021-04-27T16:12:52
- Metadata standard name
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ISO 19115:2003/19139 - SEXTANT
- Metadata standard version
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1.0