Has There Been a Detectable Trend in the Biogeochemical Signals of the Lower Amazon River Over the Last 40 Years?

Jeffrey E Richey, University of Washington Seattle Campus, Seattle, WA, United States, Nicholas D Ward, Pacific Northwest National Laboratory, Richland, WA, United States, LUiz Antonio Martinelli, CENA/USP University of Sao Paulo, Piracicaba, Brazil and Emilio Mayorga, Applied Physics Laboratory University of Washington, Seattle, WA, United States