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Potential use of ERS‐1 and Topex/Poseidon altimeters for resolving oceanographic patterns in the Algerian Basin

Two independent and concurrent (1992–1993) sources of data obtained from ERS‐1 and Topex/Poseidon satellites, provide a first look at the spatial distribution of mesoscale sea surface variability in the Algerian Basin. Values higher than 6 cm rms were found in a narrow band extending along the Algerian slope between 0° and 4°E, where meander formation and eastward eddy propagation occurred. East of 4°E, patterns of higher variability were also seen in the interior of the basin resulting from detachment of eddies from the Algerian Current that drift seaward. Based on geostrophic velocity estimates at crossover points, the eddy field variability appeared to be anisotropic, especially in the vicinity of the Algerian Current. Two mesoscale features whose signatures were clearly identified from altimeter transects, were supported by cloud‐free AVHRR infrared imagery. In particular, the path of an anticyclonic eddy (140 km diameter with drift of ∼3 cm s−1) was sufficiently coherent with the temporal and spatial sampling of altimeters to describe its kinematic behaviour. The results thus demonstrate the potential usefulness of satellite altimetry for monitoring oceanographic conditions in the Algerian Basin.