a – coastal landing (yellow: “hotspots”) in the case of a simultaneous release of a large numbers of tracers, The abscissae is the index of the coastline (see encapsulated figure). b- annual mean. c-e: origin (annual mean) of the tracer accumulated in c – the region 1 (Island of Cuba) , d – 2 (Bay of Campeche) and e – 3 (Mississipi’s Mouth)