Improved description of the ocean mesoscale variability by combining four satellite altimeters

Details Improved description of the ocean mesoscale variability by combining four satellite altimeters Improved description of the ocean mesoscale variability by combining four satellite altimeters

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3302611p&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 2, CiteID L02611

Physics

36

Oceanography: General: Coral Reef Systems (4916), Oceanography: General: Remote Sensing And Electromagnetic Processes (0689, 2487, 3285, 4455, 6934), Oceanography: Physical: Eddies And Mesoscale Processes, Oceanography: Physical: Instruments And Techniques

Scientific paper

Data from four satellite altimeters are combined with the aim of improving the representation of the mesoscale variability in the Global Ocean. All missions [Jason-1, ERS-2/ENVISAT, Topex/Poseidon interleaved with Jason-1 and Geosat Follow-On] are cross-calibrated previously to produce weekly gridded maps. In areas of intense variability, the rms differences between a classical configuration of two altimeters and the scenario merging four missions can reach 10 cm and 400 cm2/s2 in SLA and EKE, respectively, which represents an important percentage of the signal variance. A comparison with surface drifters shows that the four altimeter scenario improves the recovery of mesoscale structures that were not properly sampled with Jason-1 + ERS-2/ENVISAT. Finally, the consistency between altimetric and tide gauge data is improved by about 25% when coastal sea level is estimated with 4 satellites compared to the results obtained with 2 altimeters.

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