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Ssalto/Duacs product changes and updates

See below the latest Ssalto/Duacs product changes and updates.

Before 2017, see the archives of changes in Ssalto/Duacs system.

September 2019: New version of experimental ssalto/duacs products: gridded maps combining altimetry and drifters

A new version (02_00) is available for experimental gridded maps combining altimetry and drifters (see product page and handbook). It takes into account new parameters of the Optimal Interpolation in order to give better comparisons to independent observations. The associated reference paper is:

Mulet S., H. Etienne, M. Ballarotta, Y. Faugere, M.H. Rio, G. Dibarboure, N. Picot, 2019. Synergy between surface drifters and altimetry to increase the accuracy of sea level anomaly and geostrophic current maps in the Gulf of Mexico, accepted for publication in the “25 years of progress in radar altimetry” special issue of Advances in Space Research journal

July 2019: Transition AVISO+ to CMEMS for gridded wave products

The European Copernicus Marine Environment Monitoring Service (CMEMS) is now in charge of the processing and distribution of the gridded L4 wave productsIndeed in the frame of the Transition AVISO+ to CMEMS, AVISO+ focuses on the distribution of innovative products whereas CMEMS is dedicated to the operational products and services. 

Since July 2019, gridded L4 wave products (called WAVE_GLO_WAV_L4_SWH_NRT_OBSERVATIONS_014_003) have been added to the CMEMS catalogue. 
Therefore the CMEMS catalogue disseminates Near-Real-Time gridded L4 wave products as well as two along-track L3 wave products (altimetry and spectral)
The CMEMS gridded L4 wave products take into account a new processing slightly different from the AVISO+ one fully described in the CMEMS QUality Information Document: QUID with a grid of 2°x2°. You will find the correspondence between the AVISO+ and CMEMS wave products in the document Migration AVISO+ to CMEMS and AVISO+ to C3S (section 8) and a brief overview of the differences in section 8.
Thus, the dissemination of the AVISO+ gridded L4 wave products will stop by the end of the year 2019


So the user is invited to register to
CMEMS as soon as possible: the useful links to CMEMS are indicated in the  document Migration AVISO+ to CMEMS and AVISO+ to C3S.

Note that for the moment, the gridded L4 wind products will still be disseminated by AVISO+.
 

July 2019: temporal extension of Climatology products (Monthly means, Monyhly climatology, Seasonal climatology)

The Monthly means, Seasonal clim, Monthly clim for Global, mediterranean and black sea (so-called Climatology DUACS2018) have been extended until December 2018.

These products are accessible via your personal page 

July 2019 : Finite-Size Lyapunov Exponents (FSLEs) and Orientations of associated eigenvectors: temporal extension of Delayed-Time products

  • The Delayed-Time FSLEs are extended until January 12th 2019. Those products are disseminated on ftp as well as on OpenDap and the Data extraction tool. See the product page for complete information and your personal page for the access.

Remind: The FSLEs are computed over 21 years and over global ocean within the SALP/Cnes project in collaboration with CLS, LOcean and CTOH. They provide the exponential rate of separation of particles trajectories initialized nearby and advected by altimetry velocities. They can be used for studies on the ocean variability in different domains of biology, assimilation, societal applications,.... Those high level products are gridded (1/25°), in Delayed-Time and on a routine production with 20-day latency and cover the global ocean.

All the information is given in the Aviso+ product page with a  complete description and in the user handbook. Moreover, a dedicated webpage showing  examples of use is available. 

June 2019: temporal extension of Climatology products (Monthly means)

The Monthly means for Global, mediterranean and black sea (so-called Clmitalogy DUACS2018) have been extended until September 2018.

These products are accessible via your personal page 

June 2019: Finite-Size Lyapunov Exponents (FSLEs) and Orientations of associated eigenvectors: temporal extension of Delayed-Time products, and new dissemination of Routine products

  • The Delayed-Time FSLEs are extended until September 23rd 2018. Those products are disseminated on ftp as well as on OpenDap and the Data extraction tool. See the product page for complete information and your personal page for the access.
  • The Routine FSLEs are now available on Opendap and Data extraction tool services.  See the product page for complete information and your personal page for the access.

Remind: The FSLEs are computed over 21 years and over global ocean within the SALP/Cnes project in collaboration with CLS, LOcean and CTOH. They provide the exponential rate of separation of particles trajectories initialized nearby and advected by altimetry velocities. They can be used for studies on the ocean variability in different domains of biology, assimilation, societal applications,.... Those high level products are gridded (1/25°), in Delayed-Time and on a routine production with 20-day latency and cover the global ocean.

All the information is given in the Aviso+ product page with a  complete description and in the user handbook. Moreover, a dedicated webpage showing  examples of use is available. 

January 2019: temporal extension of the Delayed-Time Finite-Size Lyapunov Exponents (FSLEs) and Orientations of associated eigenvectors

The Delayed-Time FSLEs are extended to June 10th 2018.
Remind: The FSLEs are computed over 21 years and over global ocean within the SALP/Cnes project in collaboration with CLS, LOcean and CTOH. They provide the exponential rate of separation of particles trajectories initialized nearby and advected by altimetry velocities. They can be used for studies on the ocean variability in different domains of biology, assimilation, societal applications,.... Those high level products are gridded (1/25°), in Delayed-Time and on a routine production with 20-day latency and cover the global ocean.

All the information is given in the Aviso+ product page with a  complete description and in the user handbook. Moreover, a dedicated webpage showing  examples of use is available. Do not hesitate to send us your feedbacks and papers, we will be pleased to add them in this page.

You will find these new data on the authenticated FTP,  Opendap and Data extraction Tool in your personal page

June 2018: Transition AVISO+ to C3S for SSALTO/Duacs products gridded products merging two satellites ('twosat')

The Copernicus Climate Change Service (https://climate.copernicus.eu/) is now in charge of the processing and distribution of the SSLATO/Duacs "two-sat-merged" Gridded products as there are produced on an operational basis for climate oriented applications. The variables are the Sea Level Anomalies (SLA), the Absolute Dynamic Topography (ADT) and the geostrophic velocities on Global, Mediterranean and Black Seas in Delayed-Time. Compared to previous products disseminated by Aviso+, an upgrade has been done mainly on the standards used in the processing.  

May 2017: End of Transition AVISO+ to CMEMS and new CMEMS version since April 19th

The European Copernicus Marine Environment Monitoring Service (CMEMS) is now in charge of the processing and distribution of some altimetry products formely distributed by AVISO+. Indeed AVISO+ now focuses on the distribution of innovative products whereas CMEMS is dedicated to the operational products and services. Since CMEMS Version3 (April 19th, 2017) all the SSALTO/Duacs “all-sat-merged” products ( (M)SLA and (M)ADT Heights and geostrophic velocities (except the Mozambique area and climatologies) ) are disseminated by CMEMS. It is foreseen to stop the production of NRT products on Aviso+ by June 19th, 2017. Please if not already done, register on CMEMS as soon as possible. See below the list of products detailed in the tables with the end date of AVISO+ dissemination when necessary. 

What you will find in the AVISO+ reference portal in altimetry:

  • All the altimetry products are on the AVISO+ Catalogue (including those disseminated by CMEMS).
  • The gridded Sea Level products (MSLA-H, MSLA-UV, MADT-H and MADT-UV) can still be visualized with the Live Access Server (LAS).
  • AVISO+ keeps disseminating (see the tables below):

    • The Sea Level Anomalies climatologies for GlobalMediterranean Sea and Black Sea.
    • The Mozambique SLA-H, MSLA-H and MSLA-UV products with upgrades related to the new version, see below.
    • The gridded “two-sat-merged” Delayed-Time series. Note that this dataset is based on only two missions at most; it is mainly for applications in need of great temporal stability; they might not be the best in quality at a given time. In a near future, those products will be disseminated via the Copernicus Climate Change Service (C3S). AVISO+ will then stop the dissemination but will still propose these products in its catalogue.

List of the products concerned by the transition:

Click on the document Migration AVISO+ to CMEMS and C3S to display the hyperlinks for each product

April 19th new version:

The CMEMS version is called V3. The main changes are the following:

  • All the variables are delivered in a unique file (sla, adt, currents,… ) with new variable names,
  • The file nomenclature has changed,
  • New datasets are disseminated: Sentinel-3A (s3a) for NRT series and AltiKa Geodetic orbit called Drifting Phase (alg) , Jason-3 (j3) for REP (=REPROCESSING or Delayed-Time) series,
  • The MSS CNES_CLS15 is used instead of DTU13 for Arctic NRT series,
  • The extension of the REP series.

The complete description about this new CMEMS version (called V3) is available here, with details about each products in the dedicated CMEMS file where you will also find new files' samples. The altimetry products are referenced by the SEA LEVEL Thematic Assembly Center (SEA LEVEL TAC). 

The detailed information about AVISO+ dissemination is given below.

The Nomenclature of the CMEMS products dedicated to altimetry is:

SEALEVEL_<zone>_<variable>_<delay>_OBSERVATIONS_008_<xxx>    Where:

  • SEALEVEL stands for all SEA LEVEL TAC products
  • <zone>=GLO for global coverage, MED for Mediterranean Sea, BS for Black Sea, EUR for European region, ARC for Arctic Ocean
  • <variable>=PHY_L3 for SLA and ADT along-track products; PHY_ASSIM_L3 for SLA along-track products dedicated to assimilation; PHY_L4 for SLA, ADT and currents gridded-merged products
  • <delay>=NRT for near-real-time, REP for reprocessing (=delayed-time)
  • <xxx>= the number attributed to each product
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