Sea level SSH from C3S
- Coverage, spatial and temporal resolution
- Data quality
- Contact person
- Data citation
RESTRICTED: This link to the data set is only available for a restricted user group. The data set is only accessible in CEN/MPI net or accessible from external nets with a customer account. Please contact ICDC if you would like to access this data from outside the network.
- View data at LAS (use pulldown menu for more years): MSLA | MADT
- Access data via OPeNDAP
- Data access via file system: /data/icdc/ocean/aviso_ssh
This is the successor to the AVISIO data set. After Copernicus Climate Change Service (C3S) took over the AVISO DUACS of the mean sea surface height (MADT) and its anomaly (msla), we now provide version DT2018 where the format changed (netcdf4, new order of variables) and the time series was extended. It includes satellite altimetry data from Topex/Poseidon, Jason-1 and -2 and -3, ERS-1 and -2, Envisat, Cryosat-2, SARAL/Altika, and Sentinel-3a.
We offer the data set "two_sat_merged" which is basically based on data from two satellites throughout the entire period. The data set has daily temporal resolution for msla, madt and the surface current components u and v. On request, we can also provide you with the "all-sat" product, which includes all satellites per time period, but which is also not recommended for long term climatological research.
Details on the data processing can be found in the Documentation section of CMEMS website, details on the change in version DT2018 can be found at the CMEMS website under the product name SEALEVEL_GLO_PHY_CLIMATE_L4_REP_OBSERVATIONS_008_057 (see references).
Last update of data set at ICDC: April 15, 2021
|Mean Sea Level Anomaly (sla)||m|
|Formal mapping error (err)||m|
|Surface current vector anomaly: u-component (ugosa)||m/s|
|Surface current vector anomaly: v-component (vgosa)||m/s|
|Absolute Mean Sea Level (adt)||m|
|Surface current vector: u-component (ugos)||m/s|
|Surface current vector: v-component (vgos)||m/s|
Period and temporal resolution:
- 1993-01-01 - 2020-03-07
Coverage and spatial resolution:
- Spatial resolution: 0.25° x 0.25°, Cartesian grid
- Geographic latitude: -89.875°N to 89.875°N
- Geographic longitude: 0.125°E to 359.875°E
- Dimension: 1440 columns x 720 rows
- Altitude: 0.0 m
Please see the documentation at CMEMS website for information about the data quality.
In addition we would like to add the following information:
- Throughout the entire period the data set is based on (at least) two satellites. As satellites have a limited lifetime the composition of satellite data changes over time. In order to mitigate inconsistencies due to utilizing different satellites during the overlapping periods of two satellites three different satellites are used for the products. A list of which sensors have been used over which periods is given in the Product User Guide (see references).
- Poleward of 66°N and 66°S the data set relies on data from one satellite only.
- Poleward of about 80°N the data set relies on pure extrapolation.
- For data close to land, in shallow water areas, and close to the sea ice cover larger uncertainties occur. We recommend to use an independent sea ice cover data set, as for instance the ASI SSM/I-SSM/IS sea ice concentration at ICDC when carrying out investigations in polar regions.
We would like to refer to a short ICDC Report (see references) with questions to AVISO and their answers.
copernicus-support (at) ecmwf.int
ICDC / CEN / University of Hamburg
ICDC / CEN / University of Hamburg
- ICDC Report: Comments about the AVISO msla & madt data sets released April 2014 Report v01, S. Kern (pdf, not barrier-free)
- CMEMS website, GLOBAL OCEAN GRIDDED L4 SEA SURFACE HEIGHTS AND DERIVED VARIABLES REPROCESSED (COPERNICUS CLIMATE SERVICE), https://resources.marine.copernicus.eu/?option=com_csw&view=details&product_id=SEALEVEL_GLO_PHY_CLIMATE_L4_REP_OBSERVATIONS_008_057
- PRODUCT USER MANUAL For Sea Level SLA productsSEALEVEL_GLO_PHY_CLIMATE_L4_REP_OBSERVATIONS_008_057SEALEVEL_MED_PHY_CLIMATE_L4_REP_OBSERVATIONS_008_056SEALEVEL_BS_PHY_CLIMATE_L4_REP_OBSERVATIONS_008_058, issue 1.0, https://resources.marine.copernicus.eu/documents/PUM/CMEMS-SL-PUM-008-056-058.pdf
- AVISO Data set, https://www.aviso.altimetry.fr/en/home.html
Please cite the data as follows:
GLOBAL OCEAN GRIDDED L4 SEA SURFACE HEIGHTS AND DERIVED VARIABLES REPROCESSED (COPERNICUS CLIMATE SERVICE), SEALEVEL_GLO_PHY_CLIMATE_L4_REP_OBSERVATIONS_008_057, Metadata provided by CMEMS, Credits: E.U. Copernicus Marine Service Information, https://resources.marine.copernicus.eu/?option=com_csw&view=details&product_id=SEALEVEL_GLO_PHY_CLIMATE_L4_REP_OBSERVATIONS_008_057
and with the following acknowledgments:
Thanks to ICDC, CEN, University of Hamburg for data support.