Mean Sea Level product and image selection
Select the area (for time series only), corrections and the kind of plot (map or time serie curve) you wish, visualise the corresponding mean sea level and download the data (NetCDF or ASCII format)
* prefered settings
** seasonal, annual signals
(1)"Reference" products are computed with the T/P-Jason-1-Jason-2 serie for the time series and with merged datasets for the maps;
(2)"multi-mission" products include all the satellite time series overlaid after being adjusted from biases. The multi-mission time series are available only as images.
- Integration of Saral mission
- Changes in Jason-1, Jason-2, Topex/Poseidon, Envisat standards, detailed in the Table "Processing and Corrections" and in the pdf document.
- Improvements in the MSL processing methodology detailed in the same pdf document.
- integration of Jason-1 geodetic orbit:
- New corrections: MSS_CNES_CLS11, new orbit
- computation of bias between repetitive orbit and geodetic orbit
- new GDR-D orbit standards.
- New corrections: MSS_CNES_CLS11, tide model: Got4.8
- Jason-1 (cycles 228 to 259) take now into account the JMR replacement product. The cycles 1 to 227 remain unchanged.
- Envisat time series extended before 2004 starting from Mai 2002.
- Envisat V2.1 GDR reprocessed data used. The new standards are also detailled in the table "Processing and corrections".
- Instrumental correction sign corrected (impact of around +2mm/year). The error detection and impact on data is detailled in:
- Envisat 2011 yearly report, A. Ollivier & M. Guibbaud
- Envisat Reprocessing impact on ocean data, A.Ollivier & M. Guibbaud
- A.Ollivier et al. 2012, Envisat ocean altimeter becoming relevant for mean sea level long term studies? (submitted in Marine Geodesy)
- new NetCDF CF format in the products and images selection interface
- Time series for Reference mission (T/P-J1-J2) are available for ALL areas,
- Three areas are added: Black Sea, North & South Hemispheres.
- Two different datasets merging satellites are now available:
- reference for the T/P-J1-J2 homogeneous time series or the merged data for the maps
- multi-mission, a plot combining all the satellites MSL curves (no data available, only time-series).
- MSL curves and data provided by Envisat and Jason-2 missions have been added.
- For all missions, MSL data have been reprocessed with GOT4.7 tidal model.
- T/P MSL have been reprocessed with a new SSB solution (Tran et al., 2010) and GSFC orbit.
January 2010: Jason-1 data computed using reprocessed GDR-C data (see Jason-1 GDR handbook for more information about this new version and its contents).
June 2009: a new option, to take the Glacial Isostatic Adjustment into account, is now available. This applies only on the global time series.
December 6, 2007: A new option is available for Jason-1 mean sea level.
Wet tropospheric correction can derive from radiometer measurements or from a model (ECMWF) (up till the recent Jason-1 data re-processing, radiometer measurements weren't really usable for mean sea level, and only the model was used). But these two data sources both can vary (model update, yet uncorrected problem on the radiometer data, etc.). We now propose both possibilities for Jason-1 mean sea level data. This should enable a quicker detection of any problem on either one.
Mean sea level computation is one of the most sensitive altimetry applications. This is why it is one of the indicators monitoring continuously the altimetry data quality (Calval).