Actualités

Jason-1 is now on its new geodetic orbit and data have been integrated to the SSALTO/Duacs system

As mentionned in the previous news (<link http: www.aviso.oceanobs.com en news-storage news-detail _blank external-link-new-window>see last operational news), Jason-1 is now on its new geodetic orbit and data have been integrated to the SSALTO/Duacs system. A new release of DUACS (version 13.0) was installed and activated on the production servers on  May 25^th 2012. Additionally, Envisat has stopped sending data since April 8^th and ESA has declared officially the end of the mission (<link http: www.aviso.oceanobs.com en news-storage news-detail _blank external-link-new-window>see operational news).Therefore, these events lead to:

 For along-track products:

• A dissemination of Jason-1 along-track data for its geodetic orbit with a change in the nomenclature: all the files and directories related to along-track products are named "j1g". At this time, all the available data have been produced, but gaps remain in the time series. For the future production, the re-processed data within 20 days will be integrated in the system.
• Jason-1 along-track files for its repeat orbit are available until March 3^rd, 2012.
• For the Jason-1 geodetic orbit, no mean profile can be used. The CNES_CLS11 Mean Sea Surface is used instead

For gridded products:

• Concerning gridded products, the Jason-1 data since May 7th are taken into account in the computation of the maps, allowing a higher quality of the products integrating three satellites.The impact is to better map the areas of strong oceanographic variability compared to maps generated with Cryosat-2+Jason-2.

<link fileadmin images news mod_actus diff_msla.png _blank download>
Difference between MSLA using 3 satellites (Jason-1, Jason-2 and Cryosat-2) and MSLA using 2 satellites (Jason-2 and Cryosat-2)

Further information:

• technical note about the charateristics and objectives of the new orbit and FAQ (<link fileadmin documents data duacs technical_note_j1_geodetic_mission.pdf _blank download>see pdf file and<link fileadmin documents data duacs j1_eol_passes.dat _blank download> list of cycles and passes) 

• impacts on new products (<link fileadmin documents data duacs _blank download>see pdf file).
• <link http: www.aviso.oceanobs.com en news-storage news-detail _blank external-link-new-window>operational news