The following message has been forwarded to all registered PO.DAAC users on behalf of the Jason-1 Project:

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We are pleased to announce that reprocessing of Jason-1 data is currently in progress.
 
The data are available as version "E" GDR data products at the AVISO and PODAAC ftp sites as follows:
ftp://avisoftp.cnes.fr/AVISO/pub/jason-1/
ftp://podaac.jpl.nasa.gov/allData/jason1/L2/
 
All products are available in NetCDF format, and are available in three forms, similar to those from the Jason-2/OSTM mission:

1. The native (N) dataset containing 1-Hz records as well as 20-Hz high-rate values (GDR)
2. The reduced (R) 1-Hz subset of the full GDR data set. (GDR-SSHA)
3. The expert sensor (S) data set containing the full radar-echo waveforms (S-GDR) in addition to the GDR dataset. (Please note that SGDRs will be available with latency of 4-8 weeks after GDR release.)

A User Handbook is provided at the above-mentioned ftp areas.
ftp://avisoftp.cnes.fr/AVISO/pub/jason-1/documentation_gdr_e/Handbook_Jason-1_v5.0_Sept2015.pdf
ftp://podaac.jpl.nasa.gov/allData/jason1/L2/docs/Handbook_Jason-1_v5.0_Sept2015.pdf
 
The User Handbook provides details on the evolution of the version "E" products compared to the preceding version "C" products.
The primary evolutions include:

1. Products are provided in NetCDF format instead of binary.
2. Orbit solutions are from so-called version "E" standards, based on ITRF08.
3. Time tags are adjusted to correct for the datation bias that existed in previous versions (A, B, C) of the Jason-1 products.
4. Altimeter range instrument correction and associated Ku- and C-band range account for error in internal path delay. (+63.9 mm compared to version C)
5. Recalibrated radiometer data, and application of near-land path delay algorithm.
6. Altimeter wind speeds are recomputed using recalibrated atmospheric attenuations from radiometer.
7. New Ku- and C-band sea state bias models, and values that are computed using revised wind speeds.
8. The ionosphere correction is recomputed using updated altimeter ranges and sea state bias correction
9. Current state-of-the art geophysical models including:
   • Model dry troposphere correction from ECMWF Reanalysis (ERA) in addition to previously available operational ECMWF
   • Model wet troposphere corrections from ECMWF Renalysis (ERA) in addition to previously available operational ECMWF
   • Model wind speeds from ECMWF Reanalysis (ERA) in addition to previously available operational ECMWF.
   • Inverse barometer and high-frequency corrections using ECMWF Reanalysis (ERA) in addition to previousl available operational ECMWF.
   • Ocean tides from FES2014 and GOT4.10 models
   • Mean sea surface from MSS_CNES-CLS11, computed from a 20-year reference period.
   • Mean dynamic topography from MDT_CNES-CLS13
   • Geoid from EIGEN2008
   • Bathymetry from DTM2000.1
   • Rain flag updated

With this announcement, Jason-1 version E GDRs for 2002-2004 (cycles 1-110) are now available.
The remaining years are scheduled for release as follows:

1. 2005-2008 by the end of October.
2. 2009-2013 by the end of November.

Best regards,
The CNES and JPL science data system teams.

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User Services Office
Physical Oceanography DAAC       Email: podaac@podaac.jpl.nasa.gov
Jet Propulsion Laboratory       WWW URL: http://podaac.jpl.nasa.gov

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