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Simultaneous Ocean Wave Measurements by the Jason and Topex Satellites, with Buoy and Model Comparisons
Nasa Technical Reports Server (Ntrs)
(Author)
·
Richard D. Ray
(Author)
·
B. D. Beckley
(Author)
·
Bibliogov
· Paperback
Simultaneous Ocean Wave Measurements by the Jason and Topex Satellites, with Buoy and Model Comparisons - Ray, Richard D. ; Beckley, B. D. ; Nasa Technical Reports Server (Ntrs)
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Synopsis "Simultaneous Ocean Wave Measurements by the Jason and Topex Satellites, with Buoy and Model Comparisons"
The verification phase of the Jason-1 satellite altimeter mission presents a unique opportunity for comparing near-simultaneous, independent satellite measurements. We here examine simultaneous significant wave height measurements by the Jason-1 and Topex/Poseidon altimeters. These data are also compared with in-situ measurements from deep-ocean buoys and with predicted wave heights from the Wave Watch 111 operational model. The rms difference between Jason and Topex wave heights is 21 cm, and this can be further lowered by application of median filters to reduce high-frequency noise. This noise is slightly larger in the Jason dataset, amounting to about 7 cm rms for frequencies above 0.05 Hz, which is the frequency at which the coherence between Topex and Jason measurements drops to zero. The probability density function for Jason shows a dearth of small waves relative to Topex. Buoy comparisons confirm that this problem lies with the Jason measurements. The buoy comparisons confirm previous reports that Topex wave heights are roughly 5% smaller than buoy measurements for waves between 2 and 5m; Jason heights in general are 2.7% smaller than Topex. Spurious dips in the Topex density function for 3- and 6-meter waves, a problem that has existed since the beginning of the mission, can be solved by waveform retracking.
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