Tidal Constants Products


Alongtrack Tidal Constants - Regional Products



The CTOH computes and distributes tidal constants estimated from its along-track 1Hz sea level anomalies (SLA) products.


SLA time series have been computed with the  X-TRACK processor for the whole TOPEX/Poseidon, Jason-1 and Jason-2 period applying the latest reprocessing CTOH standards. As long-term CTOH SLA time series are distributed onto a reference grid along the satellites ground track, tidal constants are estimated directly by harmonic analysis of each single time series (i.e. every 6.2km).

CTOH tidal constants product contains along-track estimates of amplitude (variable 'amplitude''), phase lag (variable 'phase_lag') for each tidal constituent (variable 'constituentname') that can be recovered locally with CTOH specific harmonic analysis software. Spatial locations of tidal estimates along the altimeter ground track are indicated in 'latitude'  and 'longitude'  variables. Record length of single time series is provided by the 'samples'' variable.

In addition, CTOH tidal constants product contains, for each tidal constituent, two along-track error estimates associated to the tidal constants. One is directly computed from the inverse method theory (variable 'mean_square_error') and the other one is taking into account the ocean background signal at aliased tidal frequencies (variable 'bg_contamination_error').



Please do not forget to mention the following sentence in all publications or communications referring to a work based on the CTOH/LEGOS altimetry dataset:

"Altimetry data used in this study were developed, validated, and distributed by the CTOH/LEGOS, France".




Examples of applications: global FES2012 tide model validation and regional Fukushima atlas validation


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