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24.05.2012 16:14 Age: 12 yrs

[Jason-1] Jason-1 data back in SSALTO/Duacs NRT products (new version 13.0)

Category: Operational news

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 25th 2012. Additionally, Envisat has stopped sending data since April 8th 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 3rd, 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
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