Submitted by jlegeais on Wed, 2017-11-15 12:02
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Different altimeter sea level products have been produced and distributed within the Sea Level Climate Change Initiative (SL_cci) project. Access to the ECV Products and further details can be obtained by sending an email with your interest direct to the team:


Unless you make a statement in your email that you do not agree, your email address will be kept so that you can be further informed of potential evolutions regarding the dataset. It will not be used for any other purpose.


The different products available are listed below:

The regional XTRACK/ALES altimeter along-track (L2P) high frequency sea level anomaliesIt consists in a database of different datasets corresponding to some coastal areas of the ocean. The v1.0 datasets cover the period 2002-2016 in the Western Africa, Mediterranean Sea and North East Atlantic Ocean. This product can be referenced with the following DOI: 10.5270/esa-sl_cci-xtrack_ales_sla-200201_201610-v1.0-201910.

* The global sea level ECV product is a multi-satellite merged product that consists in a database of different elements that can be referenced with the following DOI: 10.5270/esa-sea_level_cci-1993_2015-v_2.0-201612. The v2.0 dataset covers the period Jan. 1993 to Dec. 2015 and includes:

  • Time series of gridded Sea Level Anomalies (SLA): 
    DOI: 10.5270/esa-sea_level_cci-MSLA-1993_2015-v_2.0-201612
    The SLA grids are calculated after merging all the altimetry mission measurements together into monthly grids with a spatial resolution of 1/4 of degree.
  • Oceanic indicators: 
    Static files over the whole altimetry operating period describing the evolution of the SLA grids just previously mentioned
    • Global Mean Sea Level temporal evolution
      DOI: 10.5270/esa-sea_level_cci-IND_MSL_MERGED-1993_2015-v_2.0-201612
    • Regional MSL trends
      Mean Sea Level changes geographic distribution
      DOI: 10.5270/esa-sea_level_cci-IND_MSLTR_MERGED-1993_2015-v_2.0-201612
    • Maps of the amplitude and phase of the annual cycle
      DOI: 10.5270/esa-sea_level_cci-IND_MSLAMPH_MERGED-1993_2015-v_2.0-201612
  • Fundamental Climate Data Record (FCDR):
    The FCDRs are the along-track SLA derived from each altimeter mission, available at 1Hz resolution corresponding to a ground distance of about 7 km. The files include a quality control and all altimeter standards applied in the SLA calculation. Global and regional inter missions biases are also included.

WARNINGAn instrumental drift has been detected in the TOPEX-A altimeter measurements during 1993-1998 and the users are informed that the SL_cci v2.0 global sea level maps (and the corresponding FCDRs as well as the derived indicators) have not been corrected for this drift. Depending on the application, the users are invited to correct the time series for this drift (see WCRP Global Sea Level Budget Group, 2018).


* A CLS/PML improved sea level Arctic product (maps of sea level anomalies) based on the Envisat and SARAL/AltiKa missions.

* A DTU/TUM gridded sea level product at high latitudes (Arctic and Antarctic) has been produced based on ERS-1 & 2, Envisat and CryoSat-2 missions.

* The altimeter SL_cci sea level anomalies (v2.0 global ECV product) have been produced with the use of the Dynamic Atmospheric Correction (DAC) forced by the ERA-Interim reanalysis. The associated 6-hourly global grids are available for the users.



The Product User Guides (PUG) related to the global sea level ECV product and the XTRACK/ALES regional coastal product can be found in the “Public Documents” section under the 'technical' label. The description of the different products and their validation can be found in the technical documents listed in this section, in the references listed below and in peer-reviewed articles of the SL_cci team listed here.



In addition of the DOIs mentioned above, please use both citations below to acknowledge:

  • The use of this sea level ECV v2.0:

Legeais, J.-F., Ablain, M., Zawadzki, L., Zuo, H., Johannessen, J. A., Scharffenberg, M. G., Fenoglio-Marc, L., Fernandes, M. J., Andersen, O. B., Rudenko, S., Cipollini, P., Quartly, G. D., Passaro, M., Cazenave, A., and Benveniste, J.: An improved and homogeneous altimeter sea level record from the ESA Climate Change Initiative, Earth Syst. Sci. Data, 10, 281-301,, 2018.

Quartly, G. D., Legeais, J.-F., Ablain, M., Zawadzki, L., Fernandes, M. J., Rudenko, S., Carrère, L., García, P. N., Cipollini, P., Andersen, O. B., Poisson, J.-C., Mbajon Njiche, S., Cazenave, A., and Benveniste, J.: A new phase in the production of quality-controlled sea level data, Earth Syst. Sci. Data, 9, 557-572,, 2017.

  • The use of the regional XTRACK-ALES coastal sea level product v1.0:

Birol F., N. Fuller, F. Lyard, M. Cancet, F. Niño, C. Delebecque, S. Fleury, F. Toublanc, A. Melet and M. Saraceno, F. Leger, 2017. Coastal applications from nadir altimetry: example of the X-TRACK regional products. Advances in Space Research,

Passaro, M., A., N., Zulfikar, 2018. Improving the precision of sea level data from satellite altimetry with high-frequency and regional sea state bias corrections, Remote Sensing of Environment, 218, 245-254,