"Mercury has a unique geochemical cycle due to its ability to exist as a gas at Earth surface conditions. As a result Hg can be transported across a region (e.g., the Midwest) or across the globe. The importance of local watershed scale versus regional/global sources is still debated. The over-arching hypothesis driving this research is that local scale sources and watershed scale processes have more impacts on the rate of Hg accumulation in the aquatic environment than regional to global scale sources."--From abstract.
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