Physics
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3513601b&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 13, CiteID L13601
Physics
5
Oceanography: Physical: Sea Level: Variations And Mean (1222, 1225, 1641), Oceanography: Physical: Western Boundary Currents, Oceanography: General: Numerical Modeling (0545, 0560), Oceanography: Physical: Instruments And Techniques, Oceanography: Physical: Currents
Scientific paper
In the Agulhas Current and its sources and sinks, variability in steric height derived from the 0.1° POP model is 3-11 times greater than the mass-load signal at periods shorter than 20 days, the approximate limit of temporal resolution for the Jason series of satellite altimeters. Model output is evaluated for realism against in situ SLA data from a suite of moorings deployed in the southeastern South Atlantic Ocean in 2003-2005. The effects of temporal filtering and alongtrack smoothing on output sampled at 10-day intervals is examined. In approximately 14% of the region, including much of the Agulhas Retroflection, aliasing is <=10% only at periods of >=120 days. Smoothing reduces that proportion by 40% but also sharply reduces variability at periods of <=73 days indicating that use of Jason-style altimetry for time series analysis of this current system should be confined to seasonal and longer scales.
Byrne D. A.
McClean J. L.
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