Observations on the Circulation in the Alboran Sea Using ERS1 Altimetry and Sea Surface Temperature Data

Abstract Data from the altimeter onboard the European Remote Sensing Satellite (ERSI) was used to Study the circulation of the Alboran Sea between 35° and 38°N, 0° and 6°W. This region is dominated by two anticyclonic gyres that are quasi-stationary in space but at times collapse over periods as short as 9 days. Maps of sea level residual, between February 1992 and December 1993, were created from the ERSI data with high correlation between sea surface temperature and residual sea level in the eastern part of the Alboran Sea. The spatially coherent signal was then extracted using the technique of complex empirical orthogonal analysis with the first three modes statistically significant. The variability of the first complex empirical orthogonal function mode appears to be associated with the incoming jet through the straits of Gibraltar with three time periods of high amplitude during the 1992–93 time frame. The second and third modes appear to be associated with the variability of both the western and eas...

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