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The semi-arid coast of Brazil is being strongly affected by regional land use and global climate changes, resulting in decreasing continental runoff to the ocean and increasing the water residence time in estuaries and expanding mangrove areas; these in turn may induce an increase of particulate Hg accumulation within the estuaries and increase the export of dissolved Hg to the ocean. This is, paradoxically, what is presently happening in Arctic rivers due to increasing, not decreasing, continental runoff associated with global climate changes. DOI: 10.5935/1984-6835.20120034O litoral semiárido do nordeste brasileiro vem sendo afetado fortemente por alterações regionais nos usos do solo e pelas mudanças climáticas globais, resultando em diminuição do aporte continental ao mar, aumentando o tempo de residência da massa de água fluvial nas regiões estuarinas e provocando uma expansão nas áreas de manguezais. Isto por sua vez, vem aumentando a acumulação de Hg particulado nos estuários e a exportação de Hg dissolvido para o mar. Paradoxalmente, este processo é similar ao que atualmente ocorre nos rios que deságuam no Oceano Ártico, porém devido ao aumento e não à diminuição do aporte continental. DOI: 10.5935/1984-6835.2012003

The Arctic Paradox: Impacts of Climate Changes on Rivers from the Arctic and the Semiarid Increase Mercury Export to the Ocean