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SWOT_Fu_2011_IGARSS.ppt
1. SWOT: A HIGH-RESOLUTION WIDE-SWATH ALTIMETRY MISSION FOR OCEANOGRAPHY AND HYDROLOGY Lee-Lueng Fu, Ernesto Rodriguez, JPL/Caltech Douglas Alsdorf, Ohio State University Rosemary Morrow, Nelly Mognard, CNES 2011 IGARSS Vancouver, Canada July 25-29, 2011
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5. SWOT WSOA Space time sampling of radar altimetry missions 10 100 days 1000 km 100 km 10 km 1 km
6. cm TOPEX/Poseidon & ERS Data Cheney et al 1983 Ducet et al 2000 Mapping Global Ocean Eddy Variability
7. Ocean Currents and Eddies Have Small Scales Conventional altimeters resolve only the large mesoscale eddies (Jason-2/Envisat) High-resolution ocean models suggest a ubiquitous presence of submesocale eddies 50% of the vertical exchange of heat and dissolved CO2 takes place at the submesoscales. ECCO2 Deepwater Horizon oil spill
8. h= H –r 1 cos( Ө ) δ h = r 1 δ θ sin( θ ) = [r 1 tan( θ ) λ /2 π B] δφ Off-nadir height measurement achieved via radar interferometry High-resolution along flight via Doppler shift in frequency High resolution achieved via Synthetic Aperture Radar
9. Radar Interferometry was successfully demonstrated by JPL’s Shuttle Radar Topography Mission (SRTM) 60m X/C band (3-6 cm wavelengths)
10. The SWOT Mission Configuration Ka band (0.85 cm wavelength) Nadir interferometry signals enhanced by a nadir receiver
11. SWOT noise spectrum SSH wavenumber spectrum 1000 100 25 10 km SWOT resolution k -4 k -2 Assemblage of ocean spectra Jason noise floor
This slide shows the space and time sampling of satellite altimeters . Before I explain how SWOT works, let me briefly go over what has been observed in the existing altimetry data and what has been missing from it
The technique for the new observation is radar interferometry, first demonstrated by JPL’s SRTM.
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