Des simulations de pluies menées sur des sols d'un transect de l'Afrique de l'Ouest ont permis de quantifier et comparer leurs ruissellements et érosions par domaines pédoclimatiques. La première partie décrit les milieux expérimentaux sahéliens, soudaniens et guinéens des vingt-six sites échelonnés des 15° N aux 05° N, présente le matériel, les pr...
In order to understand the impact of hydrological changes of the Amazon River on sedimentary organic matter (OM) composition in Amazonian floodplain lakes, three sediment cores were collected from Lake Maraca (eastern Amazonia) along a transect from the Amazon River main channel to inland. The cores were dated with C-14 accelerator mass spectrometr...
Des simulations de pluies menées sur des sols d'un transect de l'Afrique de l'Ouest ont permis de quantifier et comparer leurs ruissellements et érosions par domaines pédoclimatiques. La première partie décrit les milieux expérimentaux sahéliens, soudaniens et guinéens des vingt-six sites échelonnés des 15° N aux 05° N, présente le matériel, les pr...
La forte croissance démographique (~3%.an-1) observée au cours des dernières décennies en Afrique subsaharienne a engendré la conversion de grandes étendues de savane arborée en cultures pluviales ou irriguées et la diminution de la durée des jachères. Afin de déterminer l’impact de tels changements d’usage du sol sur la recharge des nappes phréati...
In order to understand the impact of hydrological changes of the Amazon River on sedimentary organic matter (OM) composition in Amazonian floodplain lakes, three sediment cores were collected from Lake Maraca (eastern Amazonia) along a transect from the Amazon River main channel to inland. The cores were dated with 14C accelerator mass spectrometry...
In order to understand the impact of hydrological changes of the Amazon River on sedimentary organic matter (OM) composition in Amazonian floodplain lakes, three sediment cores were collected from Lake Maraca (eastern Amazonia) along a transect from the Amazon River main channel to inland. The cores were dated with C-14 accelerator mass spectrometr...
The aim of this chapter is to introduce the main topics in the Mediterranean circulation research and to give a general description of the Mediterranean Sea variability. Its scope is to provide information that is important for a comprehensive view of the most relevant issues concerning climate, which is a coupling between atmosphere and sea. The c...
The aim of this chapter is to introduce the main topics in the Mediterranean circulation research and to give a general description of the Mediterranean Sea variability. Its scope is to provide information that is important for a comprehensive view of the most relevant issues concerning climate, which is a coupling between atmosphere and sea. The c...
