| Summary: | The PARTNERS and Arctic-GRO projects sample the biogeochemistry of the six largest rivers draining to the Arctic Ocean: the Yenisey, Ob', Lena, and Kolyma Rivers in Siberia and the Yukon and Mackenzie Rivers in North America. 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 II (Arctic-GRO II; NSF-OPP-1107774) Project spanned the years between 2012 and 2016, and continues a sample collection effort that has been ongoing since 2004. On each river, samples were collected bi-monthly (six times per year), with target sampling months alternating between years. The Arctic Great Rivers Observatory III (Arctic-GRO III; NSF-OPP-1602615) Project (2017-2019) follows Arctic-GRO II. Full field and laboratory details for Arctic GRO II can be found in the "Sample Collection and Analyses" document on this page. For real-time updates of the Arctic GRO dataset, please visit www.arcticgreatrivers.org/data .
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