We base our processing on RADS (as of 2018 Release 1). Refer to the RADS data manual for specific details of the variables.
The table below describes the parameters used in computing the global mean sea level.
Parameter | TOPEX | Jason-1 | Jason-2 | Jason-3 |
Time Period | 1992-12-06 to 2002-01-10 | 2002-01-15 to 2008-07-02 | 2008-07-03 to 2016-02-17 | 2016-02-18 to present |
Cycles | 8-343 | 1-239 | 1-280 | 1-current |
Base Data Set | RADS | RADS | RADS | RADS |
Orbit | RADS: alt_std1204 | RADS: alt_gdre | ||
Range & Corrections | ||||
Waveform Tracker | RADS: range | |||
Dry Troposphere | RADS: dry_tropo | |||
Wet Troposphere | RADS: wet_tropo | |||
Ionosphere | RADS: iono | |||
Sea State Bias | RADS: ssb_cls | RADS: ssb_tran2012 | ||
Center of Gravity | not applied | N/A | ||
Cal-1 Mode Correction | not applied | N/A | ||
Mean Sea Surface & Corrections | ||||
Mean Sea Surface | RADS: mss_dtu15 | |||
Ocean Tide & Loading Tide | RADS: tide_ocean_fes14, tide_load_fes14 | |||
Solid Earth Tide | RADS: tide_solid | |||
Pole Tide | RADS: tide_pole | |||
Atmospheric Pressure (Inverted Barometer) | RADS: dac | |||
Glacial Isostatic Adjustment (GIA) | RADS: gia | |||
Processing Corrections | ||||
Inter-Mission Bias | 1.9 mm (TX-A to TXB) | 84.5 mm (TX-B to Jason-1) | -72 mm (Jason-1 to Jason-2) | -29.9 mm (Jason-2 to Jason-3) |
Minimum Ocean Depth | RADS: topo_srtm30plus < -120 m | |||
Outlier Removal | anomaly greater than 2 m | |||
Area Weighting | RADS: inclination-dependent weighting |