Reconstruction of pollutant lead invasion into the tropical North Atlantic during the twentieth century

In this study we reconstruct pollutant lead transport and input into the Caribbean basin in relation to the meteorological changes and past industrial activities. These reconstructions are based on the geochemical data obtained from massive corals collected in 1998 in Mona Island. Lead concentration profile mimics the general atmospheric lead trend obtained from the previous investigations on ice cores, carbonate skeletons and in sediments from the North Atlantic. This similarity corroborates the significance of anthropogenic impact on all reservoirs of the North Atlantic as associated with the proliferation of the automobile and use of leaded gasoline during the twentieth century. Our high-resolution record reveals a 2-4 years shift between the maximum pollutant lead input to Mona Island and leaded gasoline consumption peaks in North America, suggesting a possible longer secondary oceanic transport of US lead within the Subtropical North Atlantic Gyre system. A striking relationship is found between lead isotopic imprints and the winter North Atlantic oscillation (NAO) index for two specific periods (1914-1929 and 1965-1997). These periods are characterized by distinct isotopic signatures from the main pollutant lead emitter to the North Atlantic troposphere, North America and Western Europe. This involves a noteworthy influence of the NAO on pollutant input and distribution in the North Atlantic that strengthens the usefulness of lead isotopes as tracers of paleo-atmospheric circulation and changes in marine circulation pathways.