Global Quality Assessment of SARAL/AltiKa‘s reprocessed GDR-F dataset
Event: 2019 Ocean Surface Topography Science Team Meeting
Session: Regional and Global CAL/VAL for Assembling a Climate Data Record
Presentation type: Type Oral
The SARAL mission was successfully launched on February, 25th 2013 and delivers high quality sea surface topography measurements since. On July 4th, 2016 an orbit maneuver was performed to move the spacecraft to a new orbit where the satellite altitude is no longer maintained, starting the so-called drifting phase.
Since the beginning of the mission Febryary 2013, the GDR (Geophysical Data Record) product version available is the GDR-T (T for Test, see:SARAL/AltiKa's Handbook ).The OSTST community requested several modifications in order to include upgraded algorithms and new standards. Considering these requests, the new GDR-F products will include a tenth of algorithm improvements: instrumental corrections, SWH look up tables, improved wet tropospheric correction, POE-F orbits, new tide models…
The main objective of this study is to assess quality of the GDR-F product over a preliminary set of data. Several method will be used, such as the comparison with the actual GDR-T data version, but also by cross-calibration with other altimetry missions (Jason-2, Jason-3). The aim is to give an overview of the future dataset and show the improvements at different scales : climate, mesoscales, coastal areas, high latitudes...
Level 2 production will start in September 2019 and the whole dataset will be delivered to users after complete validation, in early 2020. The yet to come GDR-F data will feed the next generation of multi-mission products (CMEMS/AVISO).