| Summary: | The PARTNERS and Arctic-GRO projects sample the biogeochemistry of the six largest rivers draining to the Arctic Ocean. To the greatest extent possible, sample collection techniques are identical across rivers. Once collected, samples are returned to Woods Hole, MA, from where they are shipped to expert laboratories for analyses. The Arctic Great Rivers Observatory I (Arctic-GRO I) Project was the successor to PARTNERS. Arctic GRO I spanned the years between 2009 and 2011, with sampling that followed the approach used during PARTNERS. On each river, samples were collected five times per year: three during the freshet, one during late summer, and one under ice. In addition to this "comprehensive" collection of data five times per year, samples were also collected daily during the freshet and analyzed for a subset of constituents. The daily freshet samples were collected from directly beneath the water surface using a polycarbonate collection bottle. The Arctic Great Rivers Observatory II (Arctic-GRO II) Project (2012-2016) follows Arctic GRO I. Full field and laboratory details for Arctic GRO I can be found in the "Sample Collection and Analyses" document on this page.
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