Rainfall and salinity of a sahelian estuary between 1927 and 1987

The Saloum river (Senegal, West Africa) is an inverse estuary, with salinities of more than 80 gl-1 reached 100 km from the sea ... Since 1950, annual maximum and minimum salinities have been increasing, with decreasing rains, at a rate of about 1.3 gl1-1 per year. Across the 1927-1987 period, both yearly extremes are well correlated with rainfall in the previous years, indicating a "memory" spanning three years or less. We have computed a water budget as a function of rainfall with three different hypotheses about the extent of the evaporating surfaces. Comparison with actual data indicate that about 60% of the lowlands are evaporating as shallow open waters would. We discuss the implications of these results for the possible future of the estuaries in the region, especially in the "green-house effect" hypothesi

Redressements NOAA AVHRR

Ce texte décrit les algorithmes utilisés par le logiciel de redressement NOAA developpé au laboratoire de télédétection du Centre de Recherche Océanographique de Dakar Thiaroye (CRODT). Il est opérationnel depuis septembre 1986. Il insiste sur les problèmes d'implantation de ce type de programme sur un petit calculateur et indique les performances obtenues. (Résumé d'auteur