Use of meteosat ISCCP B2 data for the study of interannual variations of climatic elements in Africa
Composite monthly images corresponding to West African rainy seasons of 1983, 1984, and 1985, have been constructed from ISCCP B2 Meteosat data. Average and standard deviation images from thermal infrared and water vapor channels are studied. In the thermal infrared, differences between the three years appear principally in the mean structure of the ITCZ, North-South extend, northward boundary, longitudinal variations of the convection. In the water vapor channel, well defined ``dry'' areas appear, showing the location and extent of subsidence regions on a large scale. These locations and extents also vary from year to year.