Summary
Abstract Shifting baselines in the Arctic atmosphere‐sea ice‐ocean system have significant potential to alter biogeochemical cycling and ecosystem dynamics. In particular, the impact of increased open water duration on lower trophic level productivity and biological CO 2 sequestration is poorly understood. Using high‐resolution observations of surface seawater dissolved O 2 /Ar and p CO 2 collected in the Pacific Arctic in October 2011 and 2012, we evaluate spatial variability in biological metabolic status (autotrophy vs heterotrophy) as constrained by O 2 /Ar saturation ( ∆O 2 / Ar ) as well as the relationship between net biological production and the sea‐air gradient of p CO 2 ( ∆pCO 2 ). We find a robust relationship between ∆pCO 2 and ∆O 2 / Ar (correlation coefficient of −0.74 and −
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