X-track, a new processing tool for altimetry in coastal areasL. ROBLOU, G. JAN, J. LAMOUROUX

Introduction of X-track processor and productsValidation of x-track SSH 1Hz product for CalVal applications

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(m

)SSH absolute bias at M3 tide gauge, Jason-1 pass 085

Mean=0.1046m

Std dev=0,0252m

Jason-1 pass 222

Jason-1 pass 085

M3 tide gauge

(Senetosa)

Applied to :

GOCEAN Project * ALTICORE Project (Poster at Hobart OSTST)

Le Hénaff studies (Gulf of Bisay) * Maraldi studies (Kerguelen) (Poster at Hobart OSTST)

Nothing new. But, the exercise could give a common framework for ssh bias computing with conditions as homogeneous as possible. This exchange plan would be made with the participant CalVal teams. It would be proposed to be applied before OSTST future meetings.

Suggestion of a common exercise for in situ CalVal and data consistencyG.Jan (1), Y. Ménard (2), P. Bonnefond (3), O. Laurain (3), L. Roblou (1)

(1) NOVELTIS (2) CNES (3) OCA

Proposal to compare and synthesize sea surface height (ssh) bias results from in situ CalVal methods. To analyse the results from CalVal sites on a computing basis as comparable as possible

Jas-1 ascending passes n°47, 149, 225

Ja-1 descending passes n° 12,88,164Source figure: Xscan software (F. Lyard et al.) : global bathymetry from

POC-LEGOS database

Ja-1 passes n°43, 206

Jas-1 ascending passes n°9, 85,187

Ja-1 descending passes n° 44, 70, 222

Ja-1 passes

N° 19, 109

Point 5: Statistics on ssh bias results on a common epoch

Validation of the synthesis in order to reach a consensus on SSH bias value

Ssh bias diffusion to the next OSTST

Validation of the synthesis in order to reach a consensus on SSH bias value

Ssh bias diffusion to the next OSTST

Synthesis interpretation of variations

Point 4: Reporting errors estimates and validation phase

Point 3 : Choice of common criteria and unused cycles

Proposal of exercise to compare and synthesize sea surface height (ssh) bias results from in situ CalVal methods. To analyse the results from CalVal sites on a computing basis as comparable as possible

Suggestion of a common exercise for in situ CalVal and data consistencyG.Jan (1), Y. Ménard (2), P. Bonnefond (3), O. Laurain (3), L. Roblou (1)

(1) NOVELTIS (2) CNES (3) OCA

It requires: from the different works on in situ CalVal missions. The definition of a common

protocol to compute ssh bias (epoch, corrections choices)

The implementation and realization of the CalVal exercise for participant teams.

Results analyses